[asterisk-users] Automatic Gain Control

[Brent Davidson]

Is there any possibility of DAHDI supporting Automatic gain control on 
TDM ports?  I'm having issues at a couple of offices where calls made to 
local numbers are fine but a when a calls from or goes to a large 
percentage of long-distance or 1-800 numbers the person at the remote 
end cannot hear the person in my office.  Boosting the gains in 
zapata.conf (I'm still using 1.4.21) to 8 solves the problem with 
long-distance lines, but then local calls say the person in my office is 
too loud.

I understand that it is going to be difficult to reliably detect a major 
drop in the volume at the far end of the call, but I'm just wondering if 
there is a good solution for this.  We're using Rhino WC4-FXO-ec cards 
and the OSlec echo canceler (since the on-board echo canceler didn't 
seem to help our echo issues)

Thanks,
Brent