[asterisk-users] Automatic Gain Control

[Danny Nicholas]

If you are using a large number of DAHDI channels, you could designate a
chunk of them as "non-local" since you can control RXGAIN on each channel.
You would have to work out something with your TELCO since your'e a dead
duck control-wise once you answer the call.

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Brent Davidson
Sent: Tuesday, July 07, 2009 10:26 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [asterisk-users] Automatic Gain Control

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

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