Supplementary service provision method and system for IMS-based network

A service provision system using an Internet Protocol Multimedia Subsystem (IMS) network, comprising:

• a plurality of user terminals;
• at least one IMS gateway that serves one or more of the plurality user terminals attached thereto;
• and
• a service provider connected to the at least one IMS gateway;
• wherein one of the plurality of user terminals transmits a retrieval request message to the at least one IMS gateway, receives a global IDentifier (ID) of a counterpart terminal of the plurality of user terminals from the IMS gateway in response to the retrieval request message, and establishes a service session with the counterpart terminal using the global ID for a specific service;
• wherein the at least one IMS gateway forwards the retrieval request message to the service provider and the global ID to the user terminal;
• and wherein the service provider retrieves the global ID of the counterpart terminal and transmits the retrieved global ID to the at least one IMS gateway,
• wherein the global ID is generated by concatenating a network ID allocated to an IMS gateway by the IMS network, to a unique user terminal ID.

A terminal management apparatus of a service provision system using an Internet Protocol Multimedia Subsystem (IMS) network, comprising:

• a registration processor that extracts device information from a registration request message transmitted by a user terminal and finds a global IDentifier (ID) and user information in a global ID registration process;
• an ID allocator that allocates the global ID to the user terminal using the device information provided by the registration processor;
• and
• a message manager that transmits the global ID of the user terminal to the network
• wherein the global ID is generated by concatenating a network ID allocated to an IMS gateway by the IMS network, to a unique user terminal ID.