由于历史的原因,过去国内通信企业还欠发达,GPT、CLT、VideoServer、VTEL、PjctureTel、SAT等国外公司的视讯产品占据了中国国家会议电视骨干网的大量市场,产品机型较多,情况复杂,互通互控也就成为了会议电视网建设的首要问题和设备选型的重要依据。确保和网上已有设备实现互通互控,是国产设备进网的基本条件,也是保护用户既有投资的重要举错。社会进步了,开会的方式发生了变化,具备节省时间、提高办事效率、跨 Due to historical reasons, in the past, domestic telecommunications companies were still underdeveloped. The video products of foreign companies such as GPT, CLT, VideoServer, VTEL, Pcturecture, SAT and other foreign markets accounted for a large number of markets for China’s national videoconference backbone networks. , Interoperability and mutual control has also become the primary issue of the construction of video conferencing and equipment an important basis for selection. Ensuring interoperability and mutual control of existing equipment on the Internet is the basic condition for home-made equipment to enter the network. It is also an important mistake in protecting users’ existing investments. Social progress, the way the meeting has changed, with the time saving, improve efficiency, cross