METHOD FOR ESTABLISHING COMMUNICATION SESSION

摘要

PROBLEM TO BE SOLVED: To provide a method for establishing a session between a terminal whose address information is not registered in a session control server and an opposite terminal.

SOLUTION: Each user terminal of a transmitting side and a receiving side mutually performs negotiation for session establishment and communicates with a near and unregistered terminal whose address information is not registered in the session control server to thereby grasp providable services in not only the self-terminal but also unregistered terminals. A session is established between the unregistered terminal and the opposite terminal without interposing a new session control server by providing the unregistered terminals with information required to establish a session with the opposite terminal.

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