[Asterisk-Users] YET Another echo issue PRI CARD Any help acc epted :-)

[Andrew Kohlsmith]

On May 26, 2005 01:58 pm, Colin Anderson wrote:
> I have had good success fiddling with the txgain and rxgain values in
> zapata.conf on my PRI. In my setup, cranking the gain down a LOT eliminated
> most of the echo, and training the users to turn down the gain on their
> handsets did the rest. It's true, with a PRI, that gains are cranked across
> the board. Turning the gain down solves a lot of echo problems, with
> negligible effect on voice quality.

There should be *NO* reason to adjust tx/rxgain on a PRI or ANY digital 
connection!  The fact that adjusting it down 10% worked suggests that the 
telco switch is boosting the signal for some unknown reason.  Use the 
technique outlined in this message:

http://lists.digium.com/pipermail/asterisk-users/2004-November/071301.html

(It works VERY well and is very straightforward, thank you Kris, I reference 
this all the time!)

Again if you're screwing with gains on PRI you have bigger problems, I think.

-A.