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Method for transferring a subscriber to a new local service provider

  • US 5,748,724 A
  • Filed: 09/01/1995
  • Issued: 05/05/1998
  • Est. Priority Date: 06/30/1995
  • Status: Expired due to Fees
First Claim
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1. A method for transferring a Subscriber of a current Local Service Provider to a future Local Service Provider comprising the steps of:

  • providing an External Local Number Portability Database storing a relationship between an NPA-NXX-XXXX directory number assigned to the Subscriber, a Service Provider Area (SPA) code, and a different exchange code NYY and line code YYYY of the Subscriber, such External Local Number Portability Database being adapted to convert therein the number, NPA-NXX-XXXX, dialed by a calling party into a converted number SPA-NYY-YYYY, where SPA is a three digit designation code assigned to each one of a plurality of Local Service Providers within a common Numbering Plan Area (NPA), each one of the plurality of Local Service Providers being assigned a different SPA code in the common Numbering Plan Area (NPA);

    marking an internal database of a switch of the current Local Service Provider with a LEAVING indication;

    querying the External Local Number Portability Database from the current Local Service Provider'"'"'s switch when such LEAVING indication is marked to determine whether the External Local Number Portability Database has been updated with a Service Provider Area (SPA'"'"') code of the future Local Service Provider; and

    if the External Local Number Portability Database has been updated, routing a call placed by the calling party to the Subscriber using the converted number SPA'"'"'-NYY-YYYY.

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