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可视电话是今后通信领域的一个重要发展领域，但目前可视电话所需的频带太宽且需要巨额投资，所以一直未能得到广泛应用．针对以上问题，本文中提出一个用于小集团的小型可视电话交换系统和现有的公共电话网同时使用的方法．系统采用单片机进行控制，并可与微机接口，管理方便，能够扩展多种功能，是一种成本低，性能价格比好的实现方案．
Video telephony is an important area for future development in the field of communications. However, the frequency bandwidth required for video telephony is too wide and requires huge investment, so it has not been widely used. In view of the above problems, this paper presents a small group of small video phone switching system and the existing public telephone network simultaneously using the method. The system uses single-chip microcomputer to control, and can interface with the computer, easy management, can expand a variety of functions, is a low cost, good performance and cost-effective implementation of the program.