[Asterisk-Users] Echo problem

[Rich Adamson]

> I use Digium TDM400 cards as well. Asterisk's software echo cancellation
> sucks. From what I've heard on the IRC channel, you'll never completely
> eliminate echo with it. And unfortunately, hardware echo cancellation starts
> out at a full T1. They don't seem to have any solution for someone with 4
> pots lines like myself. 
> 
> I haven't been able to completely eliminate echo, but I've come close by
> using the following:
> 
> echocancel=64
> echocancelwhenbridged=no
> echotraining=800
> rxgain=4.5
> txgain=0.0
> 
> echocancel=64 was significantly better than echocancel=128 (supposedly the
> same setting you get when you use echocancel=yes)

I'm not the OP, but thought I'd add what my TDM04b is using:
echotraining=800
echocancel=yes
echocancelwhenbridged=yes
rxgain=5.0
txgain=0.0

Things are working pretty good. (No other changes at all when 
compiling cvs-head.)