Patent ID: 8996673
Filing Date: 2015-03-31
Classification: H04L,H04M,H04W

Abstract:
1. A method of handling emergency signaling in an IP Multimedia Subsystem network, the method comprising: at a Proxy-Call Session Control Function, receiving a SIP message associated with an IP Multimedia Private Identity, the SIP message requesting set up of a session; at the Proxy-Call Session Control Function, determining that the SIP message relates to an emergency call; determining whether an emergency override tag associated with the IP Multimedia Private Identity is provided at the Proxy-Call Session Control Function, wherein the emergency override tag, if provisioned, the SIP message and the emergency call is handled by a Serving-Call Session Control Function, and the emergency override tag, if not provisioned, the SIP message and the emergency call is handled by an Emergency-Call Session Control Function; in the event that an emergency override tag associated with the IP Multimedia Private Identity is provisioned at the Proxy-Call Session Control Function, forwarding the SIP message to the Serving-Call Session Control Function for further handling; and in the event that an emergency override tag associated with the IP Multimedia Private Identity is not provisioned at the Proxy-Call Session Control Function, forwarding the message to the Emergency-Call Session Control Function.