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System and method for indicating emergency call back to user equipment

  • US 9,185,216 B2
  • Filed: 11/15/2007
  • Issued: 11/10/2015
  • Est. Priority Date: 06/15/2007
  • Status: Expired due to Fees
First Claim
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1. An apparatus, comprising:

  • a user equipment including a processor configured to recognize an Internet Protocol Multimedia Subsystem, IMS, call as an emergency call from a Public Safety Answering Point, PSAP, by an indication that is included in a Session Initiation Protocol, SIP, Invite message,wherein the indication is a string of characters that identifies the PSAP as the source of the emergency call, andwherein the indication is included in a P-Asserted-Identity Header of the SIP Invite message,wherein the user equipment triggers an autonomous action when the user equipment does not receive an input in response to the emergency call within a predefined length of time after the user equipment receives the indication, andwherein the autonomous action is at least one of;

    sending an automated message to the PSAP;

    sending a location of the user equipment to the PSAP; and

    sending an automated message to an emergency-related entity other than the PSAP.

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