Common use of Local Switching Capability, including Tandem Switching Capability Clause in Contracts

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaCom’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxx. 4.3.5 Where ITC^DeltaCom has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s GSST. For such local calls, BellSouth will charge ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxx. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaCom. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaCom<customer_short_name>’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom <customer_short_name> has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom <customer_short_name> local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom <customer_short_name> local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom <customer_short_name> the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom <customer_short_name> shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom <customer_short_name> has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom <customer_short_name> End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s GSST. For such local calls, BellSouth will charge ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxx. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaCom. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;ten

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComMRC’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom MRC has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom MRC local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom MRC local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom MRC the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom MRC shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom MRC has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom MRC End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom MRC the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom MRC shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom MRC the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom MRC selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom MRC will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom MRC all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComMRC. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComNGTelecom’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom NGTelecom has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom NGTelecom local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom NGTelecom local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom NGTelecom the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom NGTelecom shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom NGTelecom has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom NGTelecom End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom NGTelecom the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom NGTelecom shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom NGTelecom the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom NGTelecom selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom NGTelecom will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom NGTelecom all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComNGTelecom. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComPreferred’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Preferred has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Preferred local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Preferred local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Preferred the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Preferred shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom Preferred has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom Preferred End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom Preferred the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Preferred shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom Preferred the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom Preferred selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom Preferred will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom Preferred all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComPreferred. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComNex-Phon’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Nex-Phon has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Nex-Phon local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Nex-Phon local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Nex-Phon the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Nex-Phon shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom Nex-Phon has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom Nex-Phon End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom Nex-Phon the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Nex-Phon shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom Nex-Phon the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom Nex-Phon selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom Nex-Phon will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom Nex-Phon all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComNex-Phon. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaCom<<customer_short_name>>’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom <<customer_short_name>> has unbundled Local Switching from BellSouth AT&T and uses the BellSouth AT&T Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth AT&T local End User selects BellSouth AT&T as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom <<customer_short_name>> local End User, or originated by a BellSouth AT&T local End User and terminated to a ITC^DeltaCom <<customer_short_name>> local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouthAT&T). For such calls, BellSouth AT&T will charge ITC^DeltaCom <<customer_short_name>> the Network Elements for the BellSouth AT&T facilities utilized. Neither Party shall xxxx bill the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth AT&T and ITC^DeltaCom <<customer_short_name>> shall be as described in BellSouthAT&T’s UNE Local Call Flows set forth on BellSouthAT&T’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxx.xxxxxxxxxxxxxxx.XX&X.xxx/xxxxxxxx/xxxx. 4.3.5 Where ITC^DeltaCom <<customer_short_name>> has unbundled Local Switching from BellSouth AT&T but does not use the BellSouth AT&T CIC for its End Users’ LPIC, BellSouth AT&T will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s GSST. For such local calls, BellSouth will charge ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxx. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaCom. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;a

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComExcel PCHP’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Excel PCHP has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Excel PCHP local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Excel PCHP local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Excel PCHP the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Excel PCHP shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom Excel PCHP has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom Excel PCHP End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom Excel PCHP the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Excel PCHP shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom Excel PCHP the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom Excel PCHP selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom Excel PCHP will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom Excel PCHP all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComExcel PCHP. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComAero’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Aero has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Aero local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Aero local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Aero the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Aero shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom Aero has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom Aero End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom Aero the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Aero shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom Aero the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom Aero selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom Aero will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom Aero all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComAero. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComSouthern Telcom’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Southern Telcom has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Southern Telcom local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Southern Telcom local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Southern Telcom the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Southern Telcom shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s GSST. For such local calls, BellSouth will charge ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxx. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaCom. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComNationNET’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom NationNET has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom NationNET local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom NationNET local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom NationNET the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom NationNET shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom NationNET has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom NationNET End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s GSST. For such local calls, BellSouth will charge ITC^DeltaCom NationNET the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom NationNET shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom NationNET the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom NationNET selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom NationNET will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom NationNET all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComNationNET. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComSouth Carolina Net’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom South Carolina Net has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom South Carolina Net local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom South Carolina Net local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom South Carolina Net the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx bill the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom South Carolina Net shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom South Carolina Net has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom South Carolina Net End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom South Carolina Net the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom South Carolina Net shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom bill South Carolina Net the Network Elements for the BellSouth facilities utilized. Each Party may xxxx bill the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom South Carolina Net selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom South Carolina Net will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom South Carolina Net all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComSouth Carolina Net. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComGrande’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Grande has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Grande local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Grande local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Grande the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Grande shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom Grande has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom Grande End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom Grande the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Grande shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom Xxxxxx the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom Grande selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom Grande will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom Grande all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComGrande. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComGSC’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom GSC has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom GSC local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom GSC local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom GSC the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx bill the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom GSC shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom GSC has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom GSC End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom GSC the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom GSC shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom bill GSC the Network Elements for the BellSouth facilities utilized. Each Party may xxxx bill the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom GSC selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom GSC will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom GSC all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComGSC. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComBTI’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom BTI has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom BTI local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom BTI local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom BTI the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom BTI shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxx. 4.3.5 Where ITC^DeltaCom BTI has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom BTI End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s GSST. For such local calls, BellSouth will charge ITC^DeltaCom BTI the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom BTI shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxx. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom BTI the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom BTI selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom BTI will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom BTI all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComBTI. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComQuality Telephone’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Quality Telephone has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Quality Telephone local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Quality Telephone local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Quality Telephone the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Quality Telephone shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s GSST. For such local calls, BellSouth will charge ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxx. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaCom. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComHome Telecom’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Home Telecom has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Home Telecom local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Home Telecom local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Home Telecom the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Home Telecom shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom Home Telecom has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom Home Telecom End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom Home Telecom the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Home Telecom shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom Home Telecom the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom Home Telecom selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom Home Telecom will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom Home Telecom all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComHome Telecom. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComGeorgia Telephone’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Georgia Telephone has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Georgia Telephone local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Georgia Telephone local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Georgia Telephone the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Georgia Telephone shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s GSST. For such local calls, BellSouth will charge ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxx. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaCom. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComFeroNetworks’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom FeroNetworks has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom FeroNetworks local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom FeroNetworks local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom FeroNetworks the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom FeroNetworks shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom FeroNetworks has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom FeroNetworks End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom FeroNetworks the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom FeroNetworks shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom FeroNetworks the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom FeroNetworks selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom FeroNetworks will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom FeroNetworks all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComFeroNetworks. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComClearwave Communications’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Clearwave Communications has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Clearwave Communications local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Clearwave Communications local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements arrangements (i.e.i. e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Clearwave Communications the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx bill the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Clearwave Communications shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom Clearwave Communications has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom Clearwave Communications End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom Clearwave Communications the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Clearwave Communications shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom bill Clearwave Communications the Network Elements for the BellSouth facilities utilized. Each Party may xxxx bill the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom Clearwave Communications selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom Clearwave Communications will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom Clearwave Communications all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComClearwave Communications. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComLatin American Telephone’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Latin American Telephone has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Latin American Telephone local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Latin American Telephone local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Latin American Telephone the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Latin American Telephone shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom Latin American Telephone has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom Latin American Telephone End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s GSST. For such local calls, BellSouth will charge ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxx. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaCom. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;ten

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComOnePoint’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom OnePoint has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom OnePoint local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom OnePoint local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom OnePoint the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom OnePoint shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom OnePoint has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom OnePoint End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom OnePoint the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom OnePoint shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom OnePoint the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom OnePoint selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom OnePoint will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom OnePoint all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComOnePoint. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComGlobal Dialtone’s End User customer local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Global Dialtone has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Userscustomers' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User customer selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Global Dialtone local End Usercustomer, or originated by a BellSouth local End User customer and terminated to a ITC^DeltaCom Global Dialtone local End Usercustomer, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Global Dialtone the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Global Dialtone shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxx. 4.3.5 Where ITC^DeltaCom Global Dialtone has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Userscustomers’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom End User Global Dialtone customer and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s GSST. For such local calls, BellSouth will charge ITC^DeltaCom Global Dialtone the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Global Dialtone shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxx. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom Global Dialtone the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom Global Dialtone selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom Global Dialtone will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom Global Dialtone all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComGlobal Dialtone. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComBCFL’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom BCFL has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom BCFL local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom BCFL local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom BCFL the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom BCFL shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom BCFL has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom BCFL End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom BCFL the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom BCFL shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom BCFL the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom BCFL selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom BCFL will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom BCFL all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComBCFL. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComKinetix’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Kinetix has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Kinetix local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Kinetix local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Kinetix the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Kinetix shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom Kinetix has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom Kinetix End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom Kinetix the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Kinetix shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom Kinetix the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom Kinetix selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom Kinetix will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom Kinetix all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComKinetix. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComFLATEL’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom FLATEL has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom FLATEL local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom FLATEL local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom FLATEL the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom FLATEL shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom FLATEL has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom FLATEL End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom FLATEL the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom FLATEL shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom FLATEL the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom FLATEL selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom FLATEL will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom FLATEL all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComFLATEL. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComSouth Georgia Pre-Paid’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom South Georgia Pre-Paid has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom South Georgia Pre-Paid local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom South Georgia Pre-Paid local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom South Georgia Pre-Paid the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom South Georgia Pre-Paid shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom South Georgia Pre-Paid has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom South Georgia Pre- Paid End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom South Georgia Pre- Paid the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom South Georgia Pre-Paid shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom South Georgia Pre-Paid the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom South Georgia Pre-Paid selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom South Georgia Pre-Paid will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom South Georgia Pre-Paid all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComSouth Georgia Pre-Paid. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComCinergy’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Cinergy has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Cinergy local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Cinergy local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Cinergy the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Cinergy shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom Cinergy has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom Cinergy End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom Cinergy the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Cinergy shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom Cinergy the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom Cinergy selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom Cinergy will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom Cinergy all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComCinergy. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComU-Dial’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom U-Dial has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom U-Dial local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom U-Dial local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom U-Dial the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx bill the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom U-Dial shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom U-Dial has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom U-Dial End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom U-Dial the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom U-Dial shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom bill U-Dial the Network Elements for the BellSouth facilities utilized. Each Party may xxxx bill the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom U-Dial selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom U- Dial will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom U-Dial all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComU-Dial. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComMicro-Comm’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom Micro-Comm has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom Micro-Comm local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom Micro-Comm local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom Micro-Comm the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx bill the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Micro-Comm shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom Micro-Comm has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom Micro-Comm End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom Micro-Comm the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom Micro-Comm shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom bill Micro-Comm the Network Elements for the BellSouth facilities utilized. Each Party may xxxx bill the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom Micro-Comm selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom Micro-Comm will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom Micro-Comm all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComMicro-Comm. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;

Local Switching Capability, including Tandem Switching Capability. 4.3.1 Local Switching capability is defined as all line-side and trunk-side facilities, plus the features, functions, and capabilities of the switch. The features, functions, and capabilities of the switch shall include the basic switching function of connecting lines to lines, lines to trunks, trunks to lines, and trunks to trunks. Local Switching includes all vertical features that the switch is capable of providing, including custom calling, custom local area signaling service features, and Centrex, as well as any technically feasible customized routing functions. 4.3.2 Unbundled local switching consists of three (3) separate components: Unbundled Ports, End Office Switching Functionality, and End Office Interoffice Trunk Ports. 4.3.3 Unbundled Local Switching combined with Common Transport and, if necessary, Tandem Switching provides to ITC^DeltaComProNet’s End User local calling and the ability to presubscribe to a primary carrier for intraLATA and/or to presubscribe to a primary carrier for interLATA toll service. 4.3.4 Provided that ITC^DeltaCom ProNet has unbundled Local Switching from BellSouth and uses the BellSouth Carrier Identification Code (CIC) for its End Users' Local Preferred Interexchange Carrier (LPIC) or if a BellSouth local End User selects BellSouth as its LPIC, then the Parties will consider as local any calls originated by a ITC^DeltaCom ProNet local End User, or originated by a BellSouth local End User and terminated to a ITC^DeltaCom ProNet local End User, where such calls originate and terminate in the same LATA, except for those calls originated and terminated through switched access arrangements (i.e., calls that are transported by a Party other than BellSouth). For such calls, BellSouth will charge ITC^DeltaCom ProNet the Network Elements for the BellSouth facilities utilized. Neither Party shall xxxx the other originating or terminating switched access charges for such calls. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom ProNet shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site: xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxxxxx://xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/products/docs/FLOWSPPT.pdf. 4.3.5 Where ITC^DeltaCom ProNet has unbundled Local Switching from BellSouth but does not use the BellSouth CIC for its End Users’ LPIC, BellSouth will consider as local those direct dialed telephone calls that originate from a ITC^DeltaCom ProNet End User and terminate within the basic local calling area or within the extended local calling areas and that are dialed using seven (7) or ten (10) digits as defined and specified in Section A3 of BellSouth’s General Subscriber Services Tariffs (GSST). For such local calls, BellSouth will charge ITC^DeltaCom ProNet the Network Elements for the BellSouth facilities utilized. Intercarrier compensation for local calls between BellSouth and ITC^DeltaCom ProNet shall be as described in BellSouth’s UNE Local Call Flows set forth on BellSouth’s Interconnection Web site at xxx.xxxxxxxxxxxxxxx.xxxxxxxxx.xxx/xxxxxxxx/xxxxwebsite. 4.3.6 For any calls that originate and terminate through switched access arrangements (i.e., calls that are transported by a party other than BellSouth), BellSouth shall xxxx ITC^DeltaCom ProNet the Network Elements for the BellSouth facilities utilized. Each Party may xxxx the toll provider originating or terminating switched access charges as appropriate. 4.3.7 Unbundled Ports may or may not include individual features. Where applicable and available, non-switch-based services may be ordered with the Unbundled Port at BellSouth’s retail rates. 4.3.8 Any features that are not currently available but are technically feasible through the switch can be requested through the BFR/NBR Process as set forth in Attachment 11. 4.3.9 BellSouth will provide to ITC^DeltaCom ProNet selective routing of calls to a requested Operator System platform pursuant to this Agreement. Any other routing requests by ITC^DeltaCom ProNet will be made pursuant to the BFR/NBR Process as set forth in Attachment 11. 4.3.10 BellSouth shall perform routine testing (e.g., Mechanized Loop Tests (MLT) and test calls such as 105, 107 and 108 type calls) and fault isolation on a mutually agreed upon schedule. 4.3.11 BellSouth shall control congestion points such as those caused by radio station call-ins and network routing abnormalities. All traffic shall be restricted in a nondiscriminatory non-discriminatory manner. 4.3.12 BellSouth shall perform manual call trace and permit customer originated call trace. BellSouth shall provide Switching Service Point (SSP) capabilities and signaling software to interconnect the signaling links destined to the Signaling Transfer Point Switch (STPS). These capabilities shall adhere to the technical specifications set forth in the applicable industry standard technical references. 4.3.13 BellSouth shall provide interfaces to adjuncts through Telcordia standard interfaces. These adjuncts can include, but are not limited to, the Service Circuit Node and Automatic Call Distributors. BellSouth shall offer to ITC^DeltaCom ProNet all Advanced Intelligent Network (AIN) triggers in connection with its Service Creation Environment and Service Management System (SCE/SMS) offering. 4.3.14 BellSouth shall provide access to SS7 Signaling Network or Multi-Frequency trunking if requested by ITC^DeltaComProNet. 4.3.15 BellSouth shall provide the following Local Switching interfaces: 4.3.15.1 Standard Tip/Ring interface including loopstart or groundstart, on-hook signaling (e.g., for calling number, calling name and message waiting lamp); 4.3.15.2 Coin phone signaling; 4.3.15.3 Basic Rate Interface ISDN adhering to appropriate Telcordia Technical Requirements;