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System and method for local number portability for telecommunication networks

  • US 6,438,223 B1
  • Filed: 03/03/1999
  • Issued: 08/20/2002
  • Est. Priority Date: 03/03/1999
  • Status: Expired due to Term
First Claim
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1. In a telecommunication system having a group of interlinked, addressable exchanges, where a call is routed to a destination exchange therein, the call routing being setup in cooperation with a signaling packet containing an address of the destination exchange passed between exchanges routing the call, a method of porting a subscriber'"'"'s directory number from a first access point provisioned in a first exchange to a second acces point provisioned in a second exchange among said group of exchanges, comprising:

  • providing a database for obtaining an address of an exchange provisioning a given directory number, said database being accessible by said group of interlinked, addressable exchanges;

    maintaining said database to reflect said subscriber'"'"'s directory number being provisioned by the second exchange instead of the first exchange; and

    intercepting a signaling packet associated with a call to said subscriber'"'"'s directory number, wherein said intercepting results in additional steps, including;

    querying said database with said subscriber'"'"'s directory number to obtain an address for the second exchange; and

    modifying the address of the destination exchange contained in the intercepted signaling packet by substituting it with that of the second exchange; and

    passing the modified signaling packet to an exchange among said group of exchanges so that said call to said subscriber'"'"'s directory number is routed to the second exchange accordingly.

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