SYSTEMS AND METHODS FOR EMERGENCY CALL ROUTE FAILOVER

摘要

A system and method for performing an emergency call route failover between an Emergency Call Session Control Function (E-CSCF) and multi-homed remote end-point functions such as Border Gateway Control Function (BGCF)/Media Gateway Control Function (MGCF) or Interconnection Border Control Function (IBCF) in an Internet Protocol Multimedia Subsystem (IMS) uses Session Initiation Protocol (SIP) and/or Domain Name System (DNS) methods. The E-CSCF and/or a DNS server monitors the availability of the remote end-points to create a peer list of route options. The E-CSCF or the DNS server selects a route option from the peer list to route an emergency call to an appropriate Public Safety Answering Point (PSAP). In the event that the route option fails, the E-CSCF fails over to the next available route option to route the emergency call.

主权项

1. A computer-implemented method of performing an emergency call route failover within a telecommunications network, the method comprising:
receiving a Session Initiation Protocol (SIP) request associated with an emergency call; initiating a SIP OPTION message towards each of multiple gateway nodes; determining a status of each of the multiple gateway nodes based on the initiated SIP OPTION message; and based on the determined status, removing one or more gateway nodes from a list of the multiple gateway nodes,
wherein the list provides one or more routing options for the received SIP request associated with the emergency call.