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Method for routing a call

  • US 6,009,160 A
  • Filed: 10/28/1997
  • Issued: 12/28/1999
  • Est. Priority Date: 06/30/1995
  • Status: Expired due to Fees
First Claim
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1. A method for routing a call to a called Subscriber using a dialed number, such dialed number being either NXX-XXXX or NPA-NXX-XXXX, comprising the step of:

  • determining from the dialed number, whether;

    (1) the dialed number is served by a local switch serving a line from which the call is placed;

    or,(2) the call is an intra-LATA call and the dialed number is not served by the local switch; and

    ,(i) if the dialed number is served by the local switch, then using the local switch to route the call to the called Subscriber using the dialed number; and

    ,(ii) if the call is an intra-LATA call and the dialed number is not served by the local switch, determining, based on an NPA of the dialed number and the exchange code NXX of the dialed number, whether local number portability is available for the dialed number; and

    (A) if local number portability is available for the dialed number, then accessing an External Local Number Portability Database using the dialed number to retrieve routing information comprising a Service Provider Area (SPA) code and routing the call using the dialed number and the routing information, wherein;

    SPA code is a three digit designation code assigned to each one of a plurality of Local Service Providers with a common Numbering Plan Area (NPA), each one of the Local Service Providers being assigned a different Service Provider Area (SPA) code in the common Numbering Plan Area (NPA); and

    ,(B) if local number portability is not available for the dialed number, routing the call using the dialed number.

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