Tunnel Device, Relay Device, Terminal Device, Call Control System, Ip Telephone System, Conference Device, and Their Control Method and Program
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United States of America Patent
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N/A
Issued Date -
Oct 30, 2008
app pub date -
Apr 28, 2005
filing date -
Sep 30, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
In a call between terminals in different FWs, tunnel devices T1, T3 mutually conduct call control and speech packet transmission by way of a relay device T2 outside of the FWs, thereby enabling a call through transmissions of speech packets and the like between the terminals even in the case of Symmetric NAT. A speech packet transmission path for RTP and the like between terminals is set as a directly routed path (direct path) rather than by way of a tunnel device thereby eliminating bottleneck in the tunnel. The IP telephone technology can be provided for transmitting speech packet by way of a tunnel even in the case of Symmetric NAT.
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