Patent ID: 8503312
Filing Date: 2013-08-06
Classification: H04L

Abstract:
1. A method of facilitating recovery from a failure of a proxy call session control function within an IP multimedia subsystem network, the method comprising the steps of: monitoring, in a gateway of a packet switched access network used by a user equipment to access the IP multimedia subsystem network, signals arriving at the gateway from the proxy call session control function; providing an indication in the gateway if the monitored signals become unacceptable; and performing an action in the gateway, in response to the indication, which signals the unavailability of the proxy call session control function to the user equipment which is associated with the proxy call session control function; wherein the providing step provides the indication in response to an interruption in the monitored signals; wherein the providing step provides the indication after a predetermined delay from receipt of the monitored signals; and wherein the predetermined delay is a function of signal traffic level from the user equipment via the gateway intended for the proxy call session control function.