| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a communication control method so as to reduce loads of relay servers. <P>SOLUTION: A voice and video communication system using IP, which connects a plurality of different networks through routers, has a plurality of relay servers 1b and 2b that relay call control signals provided with global IP addresses and voice/video/Fax/modem data. A communication path through the relay servers 1b and 2b is determined whether or not to be connected using test packets, so that a NAT router type is determined. Based on the result, if it can be connected, voice/video/Fax/modem data is transmitted and received between terminals using a peer-to-peer method. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
