Patent ID: 8369313

Claim:
A method for providing multimedia services to subscriber user equipment within an internet protocol multimedia subsystem network, comprising: configuring the internet protocol multimedia subsystem network to provide a single subscriber user equipment with a capability of fork registering with multiple serving-call session control functions, wherein the configuring includes setting a multiple serving-call session control function forking data field for the single subscriber user equipment maintained by a home subscriber server; and wherein: the single subscriber user equipment signals to fork register with a proxy call session control function; the proxy call session control function signals to register with an interrogating call session control function; the interrogating call session control function signals the home subscriber server, the home subscriber server responds by determining whether the single subscriber user equipment is already registered, and whether the single subscriber user equipment is enabled to fork register to multiple serving-call session control functions, and signals the interrogating call session control function with eligible serving-call session control function capabilities if the multiple serving-call session control function forking data field is set; and the interrogating call session control function responds by choosing the multiple serving-call session control functions from eligible serving-call session control functions, and register signalling the chosen, eligible multiple serving-call session control functions.