| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication system which can respond to calling to a certain communication terminal from the communication terminal of an originator in the other communication terminal in a comparatively simple procedure. SOLUTION: The communication system which performs a communication according to the communication protocol of an SIP includes a first communication terminal Bob, and a second communication terminal Bill. The second communication terminal Bill has a means for transmitting an alternative response control message to the first communication terminal Bob when the first communication terminal Bob receives the incoming message from an originator communication terminal Alice. The first communication terminal Bob has an incoming message transfer means for transferring the incoming message from the originator terminal Alice to the second communication terminal Bill, and a response message transmitting means for transmitting the response message including contact information for specifying the second communication terminal Bill to the originator communication terminal Alice when the alternative response control message is received. A call is established between the communication terminal Alice for originating and the second communication terminal Bill. COPYRIGHT: (C)2006,JPO&NCIPI
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