cpu load on te4xxp cards is very low, and now that they have echo cancellers as add-ons cards, it will be even lower. I can't speak on hardware compatibility as i never tried a sangoma card. (But i can say that in the last year i've never had an issue with digium cards and we have 8 in use.) The te405p card resolved most incompatibilty issues.
Digium has a hardware echo can?
Yes. Send them an email about the TE411P and tell them you want the upgrade option.
the upgrade is only $1500 iirc, on top of the $1599 you just paid for the card.....
roy
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