sdp used to mute/ unmute channel

I am developing a softphone based on the sip-communicator and java-asterisk API's. I was wondering if anyone could help me with sending a message to asterisk to mute/ unmute a channel?

I am using the Trixbox flavor of asterisk.

Thank you

Sergei

Incase anyone has a similar problem I found a simple solution is to simply stop the transmit RTP stream. You need to implement some extra methods as, the stopTransmit method in the mediaManager actually destroys the stream too. If you just do a simple process.stop() and process.start() inside the transmit class you won’t need to continuously re-create new streams. Simple and elegant, thanks all.

Sergei