Patent ID: 8599833
Filing Date: 2013-12-03
Classification: H04L

Abstract:
1. A method of transporting signalling bearer status information in an IP Multimedia Subsystem, the signalling bearer status information identifying a status of a signalling bearer between a terminal and a proxy node in a telecommunications network, the method comprising: detecting at the proxy node that the signalling bearer between the terminal and the proxy node has been lost; in response to detecting that the signalling bearer between the terminal and the proxy node has been lost, sending a Session Initiation Protocol (SIP) request from the proxy node to a Serving Call/Session Control Function (S-CSCF) of the IP Multimedia Subsystem, the SIP request indicating the signalling bearer status comprising loss of the signalling bearer; verifying by the S-CSCF that the SIP request was generated by a trusted entity; recording the signalling bearer status by the S-CSCF; and utilizing th recorded signalling bearer status by the S-CSCF to determine the handling of further traffic to be routed toward the terminal.