| 摘要 |
<p>When a communication malfunction occurs in the transmission line (100) between routers (13,23), and operation is carried out by a backup system control device (21), IP telephone terminals (22-1,22-n) can connect to the backup system control device (21) through the use of an IP address that is previously acquired from the address management device (12) and saved. When the transmission line has been restored, the IP telephone terminals reconnect to the address management device (12) so that operation can be carried out using an IP address under the control of the address management device. In a system that is operated by DHCP, it is thereby possible to construct a network that can be operated without installing a DHCP server at each remote station (Fig. 1).
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