FAILURE RECOVERY IN AN IP MULTIMEDIA SUBSYSTEM NETWORK

摘要

A method is provided for facilitating recovery from the failure of a Serving Call Session Control Function (S-CSCF) within an IP Multimedia Subsystem (IMS) network. The method comprises receiving at a Proxy Call Session Control Function (P-CSCF) a SIP request sent by a User Equipment (UE) possessing an identity previously registered with the IMS network and for which a given S-CSCF was selected. At said P-CSCF it is determined if said given S-CSCF has failed or is otherwise unreachable. If the S-CSCF has failed or is otherwise unreachable, a reregistration message is sent from the P-CSCF to said UE, receipt of said reregistration message at the UE forcing the UE to perform an IMS registration procedure with the IMS network.