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IDENTIFYING PUBLIC SAFETY ANSWERING POINT (PSAP) CALLBACKS IN INTERNET PROTOCOL (IP) MULTIMEDIA SUBSYSTEM (IMS) EMERGENCY SERVICES

  • US 20120184238A1
  • Filed: 01/12/2012
  • Published: 07/19/2012
  • Est. Priority Date: 01/14/2011
  • Status: Active Grant
First Claim
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1. A method for use in a wireless transmit/receive unit (WTRU), the method comprising:

  • transmitting, by the WTRU in a first network, a registration message to a service call session control function (S-CSCF) in a second network;

    receiving, by the WTRU, a registration response including an information element (IE) including a public safety answering point (PSAP) callback identifier, wherein the IE is stored by the WTRU;

    transmitting, by the WTRU, an emergency call to the PSAP in the second network, wherein the emergency call includes the PSAP callback identifier; and

    receiving, by the WTRU, a callback from the PSAP, wherein the PSAP callback includes the PSAP callback identifier.

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