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.
National Access Contribution - See USF .
National Access Fee - See PICC .
Network Access Charge For Interstate Calling - See Federal Subscriber Line Charge
Number Portability Service Charge - See Local Number Portability .
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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