| 摘要 |
PROBLEM TO BE SOLVED: To provide a telephone system by which caller's convenience is enhanced by effectively using a presence managing function. SOLUTION: A SIP (Session Initiation Protocol) server 40 manages presence information to manage whether a user is present or absent by IP telephone sets A1 to Am, and B1 to Bn. At a call request, the SIP server 40 confirms the presence information of an IP telephone set an an incoming destination and informs the IP telephone set as a calling source that the user of the IP telephone set as the incoming destination is absent in such a case. The IP telephone set having received the information displays the reception on a display unit to let the user know. Further, the SIP server discards the request to call the IP telephone set whose user is absent. COPYRIGHT: (C)2007,JPO&INPIT
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