NXX, NXX Code, Central Office Code or CO Code Clause Samples
The NXX, NXX Code, Central Office Code, or CO Code clause defines the specific three-digit prefixes within a telephone numbering plan that identify a particular central office or exchange. In practice, these codes are used to route calls within the public switched telephone network and are assigned to telecommunications carriers for use in specific geographic areas. By clearly specifying the meaning and application of these codes, the clause ensures accurate call routing and helps prevent confusion or disputes over number assignments.
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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 10-digit telephone number within the NANP. Each NXX Code contains 10,000 station numbers.
NXX, NXX Code, Central Office Code or CO Code. The second three digits (NXX) of a ten-digit telephone number in the form NXX NXX- XXXX, where N represents any one of the numbers 2 through 9 and X represents any one of the numbers 0 through 9.