System and method for controlling coupling between communication terminals for audio-video communication

A system for controlling coupling between communication terminals for audio-video communication with a third communication terminal having video and audio communication functions, the system comprising:

• a first communication terminal that performs reciprocal recognition with a second communication terminal on the basis of a wired and wireless local area network (LAN), establishes a first speech path for the video communication with the second communication terminal to set up a coupling, and performs communication of video signal and lip-sync packet from the second communication terminal through the first speech path;
• and
• a second communication terminal that performs reciprocal recognition with a first communication terminal on the basis of the wired and wireless LAN, establishes a second speech path for audio-video communication with the third communication terminal to set up a coupling, performs any one of video communication and audio communication with the third communication terminal using the second speech path, and selectively performs communication of video signal and lip-sync packet on the first communication terminal.

A method for controlling coupling between communication terminals for audio-video communication, the method comprising the steps of:

• setting up, by a first communication terminal having a video communication function and a second communication terminal having an audio communication function, a coupling mode therebetween;
• and
• checking a coupling between the first communication terminal and the second communication terminal by means of a coupling identification code, and setting a speech path for transceiving video data to set up the coupling.

A method for controlling coupling between communication terminals for audio-video communication, the method comprising the steps of:

• while a second communication terminal having an audio communication function is coupled with a first communication terminal having a video communication function in a started state, starting the first communication terminal by supplying the first communication terminal with power again;
• and
• checking from the first communication terminal started in the step of starting whether to be coupled with the second communication terminal, and restoring a coupling between the first and second communication terminals.

A method for controlling coupling between communication terminals for audio-video communication, the method comprising the steps of:

• while a first communication terminal having a video communication function is coupled with a second communication terminal having an audio communication function in a started state, starting the second communication terminal by supplying the second communication terminal with power again;
• and
• checking from the second communication terminal started in the step of starting whether to be coupled with the first communication terminal, and restoring a coupling between the first and second communication terminals.

A method for controlling coupling between communication terminals for audio-video communication, the method comprising the steps of:

• setting up, by a first communication terminal having a video communication function itself, a video recognition coupling mode, and setting up, by a second communication terminal having an audio communication function itself, the video recognition coupling mode;
• and
• reading, by the first communication terminal, a recognition code where a media access control (MAC) address of the second communication terminal is coded at a liquid crystal display (LCD) window of the second communication terminal, and thus setting coupling and speech path information between the first communication terminal and the second communication terminal to set up a coupling.