styelz
Joined: Sat 12 of Aug, 2006
Posted:Wed 23 of May, 2007 (04:57 UTC)
Digium are charging $10 for a 1 channel HPEC licence.
http://www.digium.com/en/products/software/hpec.php

I decided to test it with my Wildcard X100P card. It completly solved my local echo problem.

rxgain=8.5
txgain=1.0
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes

Works great for me on my P3 733Mhz.

Check out this link:
http://forums.digium.com/viewtopic.php?p=50887&sid=ee023f82de284b893074a41f2e573c2a

All the best.