[Asterisk-Users] No sound when calling in from pstn

[Rich Adamson]

> I have tdm400p with 4 fxo modules on it. When I call into the asterisk 
> box from my mobile, I can see the asterisk console picks the call up 
> and routes it to my computer with x-lite. There was no sound coming 
> from either - just silence. I then decided to route it directly to 
> voice mail to see if that would narrow the problem down, but it too 
> doesn't make any sound. I can see asterisk display what it is saying 
> when going through the voicemail sequence, it is just I cannot hear it 
> on my mobile.
> 
> here is my zapata.conf
> 
> context=incomingcall ; from-1800
> signalling=fxs_ks
> faxdetect=incoming
> usecallerid=yes
> echocancel=yes
> echocancelwhenbridged=no
> group=1
> channel=>1

You might consider looking at the 
 /usr/src/asterisk/configs/zapata.conf.samples
and read about rxgain and txgain. Those are parameters to control
the volume.