[asterisk-users] How to hangup all channels

Sat Nov 27 03:25:01 CST 2010

Hi guys, I'm using Asterisk 1.4 and i need a way to hangup all channels. 
I want to use the teleyapper system for broadcasting call for security reason but i need that all channels are free when a security call is ready to start!
I already search in the old post without success. 
Can anyone help me? 
Thanks and sorry for my newbie english
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