| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an inter-subscriber terminal communication system capable of attaining the VoIP under a VLAN environment wherein communication between subscriber terminals is limited. <P>SOLUTION: An SIP server 400 for executing the Internet protocol to set up a call of an IP phone is provided with a media switch means 700 and a conversion table 800. The media switch means rewrites the IP address and port number of its own subscriber terminal designated as a reception destination of a media signal in a call control message from subscriber terminals 100 to 103 connected to the VLAN into the IP address and port number of the SIP server which are pooled and can be used. The conversion table stores rewritten cross-referenced information. The media switch means transmits the media signal addressed to the IP address and port number of the SIP server received from the subscriber terminal to the IP address and port number of the opposite subscriber terminal converted on the basis of the conversion table at media signal communication. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
