Patent ID: 7353278
Filing Date: 2008-04-01
Classification: H04L,H04W

Abstract:
1. A communication system comprising: a multimedia network comprising an internet protocol multimedia subsystem, the multimedia network further comprising a home subscriber server configured to store user information and call state control function entities; an entity that is external to the multimedia network and configured to subscribe to the multimedia network for notifications regarding events that associate with at least one other entity of the communication system, the configuration being such that subscription messages from the external entity are routed to at least one serving call state control function entity based on information stored in said home subscriber server, said at least one serving call state control function entity is provided with a storage configured to store information received in said subscription messages, and said at least one serving call state control function entity sends a notification in response to an event defined by said information stored in the store of the serving call state control function entity.