Patent ID: 8837463

Claim:
An IP Multimedia Subsystem (IMS) for providing a service via a network to at least one subscriber, comprising: at least a first proxy function and a first server function for handling messages with a first protocol, wherein the first protocol is a Session Initiation Protocol (SIP), a subscriber database connected via a first interface including a Cx Interface to the first server function, at least a second proxy function and a second server function for substituting the first proxy function and the first server function, and for handling messages with a second protocol, wherein the second server function is implemented into a signalling path of the second protocol and directly connected via a second interface to the subscriber database, the second interface includes a Cx Interface modified to connect to the second server function, wherein in the subscriber database a standard subscriber profile is stored which includes a list of initial filter criteria which are used to detect a match and perform appropriate forwarding of a message to a destination application server, wherein the initial filter criteria include additional session types which are not used in SIP.