Patent ID: 8045983

Claim:
A method for providing an IP multimedia subsystem (IMS) service in response to an advanced intelligent network (AIN) trigger, the method comprising: monitoring, at a network node, signaling messages involving non-IMS devices; at the network node, automatically registering a non-IMS device with an IMS network by sending a registration message to an IMS network element in response to detecting one of the following signaling messages transmitted between network elements: a call setup message associated with the non-IMS device; and a presence-related message associated with the non-IMS device; detecting, at the network node, firing of an AIN trigger concerning the IMS-registered non-IMS device; identifying an IMS service to be provided in response to the AIN trigger; and providing the IMS service, wherein detecting firing of an AIN trigger includes receiving a transaction capabilities application part (TCAP) message indicating the firing of the AIN trigger, wherein identifying an IMS service to be provided in response to the AIN trigger includes extracting information from the TCAP message and formulating a corresponding session initiation protocol (SIP) message including the trigger information and communicating the SIP message to a serving call state control function where the non-IMS device is registered, wherein identifying the IMS service includes querying a home subscriber server (HSS) function to identify the IMS service.