1747-SDN
1747-SDN
1747-SDN
1747-SDN
上层通讯协议
在视频会议系统中，目前最流行的有H.323和SIP协议，在流媒体应用中，ISMA rtsp应用得比较多，它属于开源项目，而很多流媒体产商有自己的流媒体传输协议，比如微软的mms等。
H.323主要用于视频会议，被称为协议簇，我们前面提到的H系列视频压缩协议和G系列音频压缩协议都属于它的子协议。除了音视频编解码器外；它还定义了各种数据应用，包括T.120、T.84、T.434等；另外还包括H.245控制信道、H.225.0呼叫信令信道以及RAS信道。详细的H.323的知识，这里就不深入介绍了。
SIP是由IETF提出来的一个应用控制（信令）协议。正如名字所隐含的--用于发起会话。它可用来创建、修改以及终结多个参与者参加的多媒体会话进程。参与会话的成员可以通过组播方式、单播连网或者两者结合的形式进行通信。
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