CO Code definition

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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CO Code means 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 containing 10,000 station numbers.
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Examples of CO Code in a sentence

  • 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 ............................................

  • II-5 1.55 NXX, NXX Code, Central Office Code or CO Code .....................

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

  • Such transfer will be accomplished with appropriate coordination between the Parties and subject to lead times specified in ATTIS Numbering Committee Guidelines ▇▇-▇▇▇▇-▇▇▇ C.O. Code (NXX) Assignment guidelines and NOF Reference Document, Part II, Section 2.3, NXX Code Opening for movements of NXXs from one switch to another.

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

  • II-6 1.60 NXX, NXX Code, Central Office Code or CO Code.........................................

  • Central Office Code or CO Code 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.

  • CARRIER’s request for intermediate numbers results inAT&T SOUTHEAST REGION 9-STATE having to submit a request for additional telephone numbers to a national numbering administrator (either the North American Numbering Plan Administration (“NANPA”) CO Code Administration or NeuStar Pooling Administration or their successors), AT&T SOUTHEAST REGION 9-STATE will submit the required numbering request to the national numbering administrator to satisfy CARRIER’s request for intermediate numbers.

  • II-8 1.69 NXX, NXX Code, Central Office Code or CO Code......................................