METHOD AND APPARATUS FOR MAINTAINING INFORMATION AT AN IMS CLIENT

摘要

A method of substantially synchronising data stored at an IP Multimedia Subsystem client with data stored at a SIP application server of the IP Multimedia Subsystem. The method comprises receiving a request for said data, sent from the client, at the application server, determining whether or not the request contains a condition identifying the current state of the data stored at the client, on the basis of any identified condition, determining at the application server whether or not to send further data to the client, and sending data in dependence upon the result of said determination.