this could be helpful:
http://txlab.wordpress.com/2012/09/17/setting-up-a-conference-bridge-with-freeswitch/




From: Dona Liz Peter <donaliz88@gmail.com>
To: freeswitch-dev@lists.freeswitch.org
Sent: Monday, July 1, 2013 10:20 AM
Subject: [Freeswitch-dev] Help : Freeswitch Conference call

 Hi everyone , 

I am new to this field. Just started trying FreeSWITCH for my project.
How can I implement the idea suggested here in a dialplan?
Can you please give an example dialplan or code?

Is it possible to mute a member in a conference using configuration ?
Please give me an example.

Thanks in advance,

Regards,

Peter

--
Mit freundlichen Grüßen,

Peter.


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