| 摘要 |
A smooth and seamless terminal switching guaranteeing continuity of communication at an application level is realized. A call control means for setting and managing a physical and logical transmission path between communication terminals, a session management means for managing establishment of data communication between the communication terminals, and a switching request processing means for controlling interruption and resumption of a session are provided, wherein the switching request processing means exercises a function to temporarily interrupt a session after receiving a session switching request signal from a communication terminal, a function to instruct the call control means to establish a call connection with a communication terminal of switch destination, a function to establish a session with an application on the communication terminal of switch destination, and a function to resume, after establishing the session, a session with a communication terminal of an opposite side.
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