At last, it simply introduces the data protocol model of Video Conferencing System.

最后，简要分析了视频会议系统的数据协议模型。

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Most of existing video conferencing systems comply with H. 323 protocol, and have a video server to receive and transfer the voice and video.

目前的视频会议系统大多基于H . 323协议，在系统中由视频服务器来接收、转发音视频数据。

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That set the stage for Cisco to sell the department on improving that network with services such as video conferencing and voice-over-Internet Protocol.

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