| 摘要 |
Disclosed are a presence based telephony system and a call routing method thereof. The telephony system includes a presence server for managing presence of telephone service subscribers, and it routes the call dialed to the subscriber to one of the subscriber's wired/wireless telephone terminal or a VoIP terminal accessed through a VoIP gateway according to the subscriber's presence information established in the presence server. According to the present invention, the user uses a VoIP terminal connected to the Internet to receive calls generated to the previously subscribed wired/wireless telephone number without spatial restrictions. Also, the user can use the wired/wireless telephone service without an additional communication device if he has a VoIP terminal connected to the Internet when he buys no expensive telephone at the time of subscribing to a wired telephone service or a mobile telephone service.
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