Any suggestions how to get the echo out on a pot line?
try searching voip-info.org for info on removing echo
turn on echo canceller
turn on echo training
turn on echo cancel when bridged
try playing with rxgain/txgain
try switching echo cancellers (edit zaptel zconfig.h (as i recall) and recompile)
try aggressive echo suppression (as above but define mark2 echo canceller and uncomment aggressive echo suppression below taht)
and if you are using an X100 card or clone, you might try sacrificing a live chicken… you may need the extra luck. (x100 cards often cause annoying echo that is difficult to resolve)
Thanks IronHelix. I will try your suggestions. I am using a digium tdm11b card.