| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To select an HTTP tunnel as a NAT traversal method such as an SIP as necessary. <P>SOLUTION: This terminal device provided subordinately to a NAT device includes a UDP transmission decision means for transmitting a UDP transmission decision message to a prescribed device connected to a communication network outside the NAT device and determining whether to receive a response message from the prescribed device for the UDP transmission decision message, an HTTP tunnel setting means for setting an HTTP tunnel between an HTTP tunneling device connected to the communication network outside the NAT device and the NAT device itself when the UDP transmission decision means determines that the response message from the prescribed device is not received, and a signaling message communicating means for transmitting and receiving a signaling message for media communication with other terminal devices via the HTTP tunnel. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
