Letter Of Agency - LOAA document that authorizes changing the service provider. (See RespOrg, 800 Portability)Local AccessLocal Loop. The connection from a subscriber to the Central Office. The portion of a circuit connecting the LEC's CO with the customer's premise equipment across the local network.Local Access ProviderAny organization that is authorized to provide local access. (May or may not be the LEC.)Local Exchange Carrier - LECThe local or regional telephone company that owns and operates lines to customer locations and Class 5 Central Office Switches. LECs have connections to other COs, Tandem (Class 4 Toll) offices and may connect directly to IECs like WorldCom, AT&T, MCI, Sprint, etc.Local Exchange ServiceLocal phone calls.Long Distance CarrierA company providing long-distance phone service between LECs and LATAs.Message Toll Service - MTSPay-by-the-minute switched long distance services. Includes conventional long distance and measured WATS.NPA Area Codes, NXX Exchanges and XXXX Line NumbersThe process for assigning 10-digit (3+3+4) North American telephone numbersNASC - 800 Number Administration and Service CenterThe 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)NPA - Numbering Plan AreasNorth American "Area Codes." (3 digits: 2-to-9, 0-or-1, 0-to-9. Middle digit to expand soon)NPA-NXX RoutingArea Code / Exchange Routing. Route calls based on the originating ANI NPA-NXX.NPA RoutingArea Code Routing. Route calls based on the originating ANI NPA (area code.)
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