Viewphone is a kind of video communication terminal that base on point to point, it makes use of current telephone network to transmit real-time bi-directional video and audio.
可视电话就是一种点到点的多媒体通信平台，它能实时双向传输通话双方的图像和语音信号。
A large number of data and video information which produced by data terminal and pronunciation information need to transmit in modern communication system.
现代通信系统中，不仅仅需要传输语音信息，还需传输各种数据终端产生的大量数据信息以及视频信息。
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