| NASC - 800 Number Administration and Service Center | The organization that administers the SMS/800 system for the reservation, registration and administration of all North American 800 numbers for all carriers. (See 800 Portability, RespOrg and SMS/800) |
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| NPA - Numbering Plan Areas | North American "Area Codes." (3 digits: 2-to-9, 0-or-1, 0-to-9. Middle digit to expand soon) |
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| NPA Area Codes, NXX Exchanges and XXXX Line Numbers | The process for assigning 10-digit (3+3+4) North American telephone numbers |
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| NPA Routing | Area Code Routing. Route calls based on the originating ANI NPA (area code.) |
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| NPA Split | Subdividing an area code, with the creation of a new area code. This is necessary when the number of telephones in an area code (NPA) grows to an excessive number. |
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| NPA-NXX Routing | Area Code / Exchange Routing. Route calls based on the originating ANI NPA-NXX. |
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| NUS | NASC SMS/800 Number Search. SMS application used to find available 800 numbers and reserve them for up to 60 days. |
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| NXX | Exchanges (First 3 digits of a 7-digit phone number). (2-to-9, 0-to-9, 0-to-9) (Digits 4, 5 and 6 in a 10 digit NANP telephone number - NPA-NXX-XXXX). |
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