| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for automatically switching an IP-only phone and a soft phone. SOLUTION: An identical telephone number is allocated to the IP-only phone 31 and the soft phone 33a. When the soft phone has been moved such that a connection destination to a LAN 10 changes from a connector 29b to a connector 29g, a relay device is also changed from a relay device 27 to a relay device 28. After recognizing its present position by a MAC address of the relay device to which it is currently connected, the soft phone 33a issues a request to an IP gateway 17 to change an IP address to the soft phone when it is judged that the soft phone is located far away from the IP-only phone. When it is judged that the soft phone is located near the IP-only phone, the soft phone issues a request to the IP gateway so that the IP address is changed to the IP-only phone. COPYRIGHT: (C)2009,JPO&INPIT
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