[asterisk-users] zap channel media volume

[Wolfgang Pichler]

Hi all,

we do have the following configuration

(non-Asterisk PBX) - T1 - ZAP (Asterisk PBX) - ZAP - T1 - (GSM Gateway) 
-> GSM Enduser

The call is originated on the (non-Asterisk PBX) - gets send over a T1 
connection to the asterisk server (which does least cost routing) - the 
asterisk server then does send the call over a GSM Gateway into the world...

The Problem we do have is - that the Users behind the non-Asterisk PBX 
are complaining about low volume media if the the calling through the 
gateway (if the are calling mobiles...). So i have started to raise the 
rxgain value for the connection between the asterisk box and the GSM 
Gateway, this does work quite well - but not really perfect. The 
ringback (not locally generated - does come from the GSM Provider) does 
get terrible loud - as soon as the callee is connected - the speech is 
nearly not hearable because it has such a low volume.

The ringback is EARLY MEDIA - if i am right - and the speech is normal 
MEDIA. So, is it possible to set different gains for EARLY MEDIA and 
normal MEDIA ?

Does anyone else have had this problem ?

regards,
Wolfgang