This article elaborated with emphasis based on the digital set-top box SIP video frequency terminal realization including SIP agreement stack realization call user 's analysis RTP data channel establishment SIP network and other networks interconnections .

本文重点论述了基于数字机顶盒的SIP 视频终端的实现，包括SIP协议栈的实现、呼叫用户的解析、RTP信息 通道的建立、SIP网络和其他网络的互联。

Video Frequency Communication Channel : When there are many controlled stations the 2 Mbps self-heal loop net can be established based on the control-platform unit .

视频 通道：当被控站较多时，采用以调度台为单位组成2Mbps自愈环网；

Uses integrated the time sharing transmission way the Controlling Signal of temperature the audio frequency and the video frequency is processed by the DSP transmits by a wireless channel .

采用集成、分时传输的方式，把温度、音频、 视频 被控对象，统一由1块DSP处理，由一条无线 通道传输。