To attain various kinds of additional service while suppressing processing loads and costs by flexibly performing session control in a communication system using an SIP.
An SIP server 13 receives an SIP signal for requesting to start a session from a terminal 11 at a transmission source and transmits the received SIP signal to a highly functional server 14. The connecting destination decision part 17 of the highly functional server 14 decides a connecting destination on the basis of information about a calling destination included in the received SIP signal, and an SIP control part 16 returns the SIP signal for instructing connection to the decided connecting destination to the SIP server 13. The SIP server 13 receives the SIP signal for instructing connection to the connecting destination from the highly functional server 14 and transmits the SIP signal for requesting to start the session to a terminal 12 at the connecting destination. The terminal 12 at the connecting destination establishes the session with the terminal at the transmission source when the SIP signal for requesting to start the session is received.
COPYRIGHT: (C)2007,JPO&INPIT
Shuji Ezaki
Nobuaki Kurihara
Tomoaki Ichikawa
Hideki Ito
Yukari Tanaka
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Yoshimoto Toyoda