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VoIP emergency call support

  • US 10,178,522 B2
  • Filed: 08/01/2006
  • Issued: 01/08/2019
  • Est. Priority Date: 08/02/2005
  • Status: Active Grant
First Claim
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1. A server for facilitating an emergency voice-over-Internet Protocol (VoIP) call, comprising:

  • a communications unit configured to;

    receive, from an IP Multimedia Subsystem (IMS) entity in a visited network, a first request to route an emergency VoIP call for a user equipment (UE) to a Public Safety Answering Point (PSAP), wherein the first request comprises first location information for the UE and an identity for the UE;

    send a second request for second location information for the UE to a first network entity; and

    receive, from the first network entity, a first response comprising the second location information andat least one processor configured toselect a PSAP for the emergency VoIP call based on at least one of the first location information or the second location information whereinthe communications unit is further configured to;

    send a second response to the IMS entity, the second response comprising at least one of an identity for the selected PSAP or routing information for the selected PSAP;

    after sending the second response to the IMS entity, receive from the selected PSAP a third request for updated location information for the UE;

    send a fourth request for the updated location information to the first network entity;

    receive a third response from the first network entity comprising the updated location information; and

    send a fourth response comprising the updated location information to the selected PSAP.

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