Patent ID: 8787356

Claim:
An apparatus for providing other services in an Internet Protocol (IP) Multimedia Subsystem (IMS), the apparatus comprising: a service interworking apparatus configured to enable communication between a Voice over IP (VoIP) service network and an IMS terminal connected to the service interworking apparatus through an IMS network by converting information received from the VoIP service network to information supportable by the IMS terminal to interwork the IMS terminal and other VoIP services not supported by the IMS terminal, and by converting information received from the IMS terminal to information supportable by the VoIP service network, wherein the service interworking apparatus is configured to interwork the IMS terminal and the other VoIP service not supported by the IMS terminal by: receiving a registration request message from the IMS terminal; upon receipt of the registration request message, performing a registration to verify IMS authentication for the IMS terminal; mapping access information for the other VoIP services and information of the IMS terminal; and logging on for the other VoIP services using the access information.