Patent ID: 8503976

Claim:
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, and sending 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.