Jingwei,
the dialplan command eavesdrop does this. The person barging in can use key
presses to dynamically turn on/off voice.

--matt
Voice Broadcasting <http://www.hellohunter.com/voice_broadcast.php> &
Predictive
Dialer <http://www.hellohunter.com>

On Mon, Sep 28, 2009 at 3:38 PM, Jingwei Yang <[email protected]>wrote:

> Hi Guys,
>
> Is it possible to restrain the call-out to be one-way, meaning the callee
> can only listen, but not speak? If so, is it possible to switch off the
> constraint dynamically during the call and allow the callee to speak?
>
> Thanks,
> -Jingwei
>
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