| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a communication terminal device and its control method which can appropriately perform T. 38 communications through a SIP (Session Initiation Protocol) proxy server. <P>SOLUTION: The communication terminal device performs image communications by the ITU-T recommendation T. 38 through the SIP proxy server. The device is provided with a communication control means which arranges T. 38 data according to the T. 38 communication procedure one by one following to progress of the T. 38 communication procedure in an INFO message which is exchanged with the partner terminal through a call control channel if the call control channel is established, which performs call control of communication with the partner terminal through the SIP proxy server, and performs the image communications by exchanging the INFO message with the partner terminal. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
