Patent ID: 9232380
Filing Date: 2016-01-05
CPC Classification: H04L,H04W

Claim Text:
1. A method for selecting a network to be used by a mobile device when initiating an emergency communication session, the method comprising: receiving, at the mobile device, a Session Initiation Protocol (SIP) header from an IP multimedia subsystem; parsing, at the mobile device, 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, and wherein the preferred network is selected by a service provider associated with the mobile device from a plurality of accessible networks based on network conditions of each of the plurality of accessible networks; determining, at the mobile device, that an emergency communication session has been requested by a user of the mobile device; and attempting to initiate an emergency communication session from the mobile device via the preferred network indicated by the parsed SIP header, and wherein the SIP header includes two emergency call mode preference fields, a first field indicating the preferred network and a second field indicating a second preferred network, and wherein the method further comprises: when the attempt to initiate the emergency communication session is unsuccessful based on the network conditions on the preferred network, attempting to initiate an emergency communication session on a different accessible network, wherein the different accessible network is the second preferred network.