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Method and apparatus for handling emergency calls

  • US 8,503,976 B2
  • Filed: 08/02/2012
  • Issued: 08/06/2013
  • Est. Priority Date: 01/19/2005
  • Status: Active Grant
First Claim
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1. A method in an IP Multimedia Subsystem (IMS) network that uses Session Initiation Protocol (SIP) of providing location information to an emergency center in a circuit-switched network for a mobile radio terminal connected to a packet-switched mobile access network, the method comprising the following steps:

  • receiving a packet-switched emergency request from the mobile radio terminal containing a calling number via a SIP INVITE message,sending a location query for the calling number to a mobile radio terminal positioning center in a mobile radio access network when more detailed location information is needed,receiving a location indication for the mobile radio terminal in response to the location query,translating the packet-switched emergency request into a circuit-switched control message for the emergency request, andsending the translated circuit-switched control message including the location indication for the mobile radio terminal to the emergency center according to one or more standards for initiating a circuit-switched emergency call.

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