Oslec + dahdi

Hi everyone. On those of you, who tested OSLEC with DAHDI on recent version of Asterisk with grate success. I use it, it reduce echo, but not at all. I think hardware echo cancellation is best, but much $$$.

So what is the best config you found for soft echocancellation OSLEC + DAHDI

chan_dahdi.conf :
echocancelwhenbridged=“yes” or "no"

Or you can buy HPEC license better than OSLEC, cheaper than physical module.