| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain gateway devices by which low delay transmission of voice data is attained and SIP message exchange by End-To-End is attained. <P>SOLUTION: The present invention provides gateway devices 11 and 12 which constitute a communication system with the opposite devices with the same configurations as those of themselves, have functions as SIP proxy servers, and by which communication via a packet service network 3 and communication via a voice service network 4 with the opposite devices are possible, when an INVITE message is received from VoIP terminals 511 and 521 which make themselves as the SIP proxy servers, establish a first communication path via the packet service network 3 and a second communication path via the voice service network 4 with the opposite devices which operate as SIP proxy servers of a destination terminal of the INVITE message, perform transmission of the SIP message using the first communication path, and perform transmission of the voice data using the second communication path. <P>COPYRIGHT: (C)2012,JPO&INPIT |
