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Routing in an IP network based on codec availability and subscriber preference

  • US 6,600,738 B1
  • Filed: 10/02/1999
  • Issued: 07/29/2003
  • Est. Priority Date: 10/02/1999
  • Status: Expired due to Term
First Claim
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1. A communications system having an originating network in communication with a terminating network via a core network, said core network comprising more than one gateway, each said gateway having at least one codec, said communications system comprising:

  • a first node in said originating network for sending a call request from a mobile station, wherein said request includes a codec type of said mobile station;

    a second node in said core network for scanning a list of gateways, said list being maintained in said second node, utilizing optimal routing criteria to determine whether there Is an optimal gateway that supports said mobile station'"'"'s codec type;

    means for placing said optimal gateway in the first position of a list of suitable gateways;

    means for selecting an alternative gateway that supports the requested codec type and then adding said alternative gateway to said list of suitable gateways in the second position and repeating the selection step until all suitable gateways in the core network are included in said list of suitable gateways;

    transmission means for sending said list of suitable gateways to said first node;

    said first node for determining whether said mobile station has a codec preference; and

    means associated with said first node for comparing said mobile station codec preference with said list of suitable gateways and determining the gateway for receiving said mobile station call according to the rank on said list of suitable gateways the compatibility of said gateway codec and said mobile station codec type, and for selecting said optimal gateway absent a compatible codec in either said optimal gateway or any one of said alternative gateways.

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