The central entity in the SIP architecture is the SIP User Agent (abbreviated to UA).
中央个体在SIP建筑学是SIP用户代理(被省略对UA)。
And constructed had the function of the SIP User Agent to the video frequency terminal.
并构建了具有SIP用户代理功能的视频终端。
It also requires a single instance of sipp, which is an open source tool used to simulate an sip user agent.
此外还需要sipp的一个实例，这是一种开源工具，用于模拟sip用户代理。
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