Silence Suppression

Hi all,

I have many asterisk boxes interconnected via IAX2.

A lot of the time calls made cross the boxes have silence being transmitted which is eating bandwidth for no good reason.

VAD at the end-users device is not an option (and i think Asterisk willn’t support it anyway) nor is bandwidth an issue between asterisk and the end-users device.

Is there a way of stopping silence being transmitted between Asterisk boxes?

Thanks, Mick