Patent ID: 8750869
Filing Date: 2014-06-10
Classification: H04L,H04M,H04W

Abstract:
1. A method for processing a call in a heterogeneous communication system that manages heterogeneous networks including a circuit network and an Internet Protocol (IP) Multimedia Subsystem (IMS) network, the method comprising: performing Voice Call Continuity (VCC) service registration of a User Equipment (UE) in the IMS network by a voice call management server at a request of the UE supporting both the circuit network and the IMS network; receiving, by the voice call management server, a subscribe message including a subscriber identification number from the UE by using a Mobility Event Package (MEP) subscribe message; allocating, by the voice call management server, a transfer number needed by the UE to transfer from the IMS network to the circuit network, in response to the subscribe message, and delivering the transfer number to the UE; performing, by the voice call management server, location registration for the UE in the circuit network using the subscriber identification number; allocating, by the voice call management server, a Routing Number (IMRN) in the IMS network for a terminating call, and delivering the IMRN to the circuit network; receiving, by the voice call management server, the terminating call from the circuit network; and anchoring, by the voice call management server, the terminating call, and delivering the terminating call to the UE corresponding to the IMRN, wherein the voice call management server is a VCC Application Server (VCC AS) and the received terminating call is a terminating call of a VCC subscriber which is determined by initial Filter Criteria (iFC) processing.