要为一个会话建立passthrough，使用以下命令。
To set the passthrough for a single session, use the following commands.
Connect_Duration：此会话建立的连接的持续时间。
Connect_Duration: Time since the connect is established for that session.
解决了可视电话会话建立流程环节较多，接通耗时比较长的问题。
The invention solves the problems that the creating process ofthe videophone session has more links, and the switching-on consumed time is longer.
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