NXX Code definition

NXX Code or "End Office Code" means the three digit switch entity indicator (i.e. the first three digits of a seven digit telephone number).
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NXX Code. Central Office Code" or "CO Code" is the three digit switch entity indicator which is defined by the "D", "E", and "F" digits of a 10-digit telephone number within the NANP. Each NXX Code contains 10,000 station numbers. Historically, entire NXX code blocks have been assigned to specific individual local exchange end office switches.
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NXX Code. Central Office Code" or "CO Code" is the three digit switch entity indicator which is defined by the "D", "E", and "F" digits of a 10-digit telephone number within the North American Numbering Plan, or as otherwise defined by the appropriate regulatory authority.
Sample 1

Examples of NXX Code in a sentence

  • If either Party uses its NXX Code to provide Foreign Exchange (FX) service to its customers outside of the geographic area assigned to such code, that Party shall be solely responsible to transport traffic between its Foreign Exchange service customers and such code’s geographic area.

  • CENTRAL OFFICE PREFIX (NXX Code) -- The first three digits of the seven-digit directory number and associated block of 10,000 numbers for use in accordance with the North American Dialing Plan.

  • NXX, NXX Code, Central Office Code or CO Code: The three-digit switch entity indicator that is defined by the "D", "E", and "F" digits of a ten-digit telephone number within the NANP.

  • II-3 1.24 NXX, NXX Code, Central Office Code or CO Code ............................................

  • Unless specified on the Additional NXX Code Opening form, subsequent NXXs of SPRINT will be routed in the same manner as the initial NXXs.


More Definitions of NXX Code

NXX Code or “Central Office Code” means the three-digit switch entity indicator that is defined by the “D”, “E” and “F” digits of a 10-digit telephone number within the NANP. Each NXX Code contains 10,000 station numbers.
Sample 1
NXX Code or “End Office Code” means the three digit switch entity indicator (i.e., the first three digits of a seven digit telephone number).
Sample 1Sample 2
NXX Code. Central Office Code" or "CO Code" is defined by the "D," "E," and "F" digits of a 10-digit telephone number within the North American Numbering Plan. Each NXX Code contains 10,000 station numbers. Historically, entire NXX code blocks have been assigned to specific individual local exchange end office switches, because, in general, this approach did not conflict with geographic numbering except as the CO approached number exhaustion. Where there are multiple COs in the same geographic area, this assignment method must change. With the advent of end-user telephone number portability, the usual one-on-one association on an NXX with an end office switching entity will be severed.
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NXX Code. OR "CENTRAL OFFICE CODE," OR "CO CODE" is the three digit switch entity indicator which is defined by the fourth, fifth and sixth digits of a 10 digit telephone number within the North America Numbering Plan ("NANP").
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NXX Code means a ten thousand (10,000) block or a one thousand (I 000) block of numbers which has the same initial three (3) digit prefix with a seven digit dialing sequence which is assigned to a LEC for the provision of its local exchange service.
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NXX Code means the three‑digit switch entity indicator (i.e., the first three digits of a seven-digit telephone number).
Sample 1
NXX Code or "central office code" means the fourth, fifth, and sixth digits in a 10-digit telephone number. This term also means a group of 10,000 sequential telephone num- bers, which all share the same fourth, fifth, and sixth digits. The NXX code denotes the exchange area within an area code. One central office code contains ten thousands- blocks, as defined in this section.
Sample 1