Patent ID: 8867411

Claim:
A method in a mobile device of selecting a network to initiate an emergency communication session, the method comprising: receiving a Session Initiation Protocol (SIP) header from an IP multimedia subsystem in response to an initial request to register a multimedia session; parsing the SIP header to identify an emergency call mode preference field, wherein the emergency call mode preference field contains an indication of a preferred network to utilize in the event of a request to initiate an emergency communication session, wherein the preferred network is specified as a network type, wherein the network type includes at least an identification of an Internet Protocol (IP) network or a cellular network, and wherein the preferred network is further identified based on a current level of traffic of the network, a reliability of the network, and a latency of the network; determining that an emergency communication session has been requested by a mobile device user; and attempting to initiate a subsequent request for an emergency communication session via the preferred network.