| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a communication apparatus of a communication system that is structured to be registered or logged-in by a terminal on a public network on the outside of an NAT router by using one public address. <P>SOLUTION: This communication apparatus includes, in a main apparatus 1, an agent server part 17 connectable to the public network INW by bypassing the NAT router RT and an LAN 3, transmits a registration request to a database 15 using a public address allocated to the agent server part 17, by an IP telephone terminal 2 on the public network INW, and receives a registration request by the agent server part 17 to notify a central control part 14. In the central control part 14, respective resource conditions of a plurality of IP telephone server parts 11-1 to 11-n or an optimum IP telephone server part 11-1 according to a set condition are/is determined, and a controlling session is established via the NAT router RT and the public network INW from the IP telephone server part 11-1 to the IP telephone terminal 2 of the request source. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
