My other question (and a more important one) is: will moving to ISDN or a different FXO card help? Does ISDN have echo problems at all, or because it is all digital, is this problem completely gone? We are thinking of installing Asterisk for our customers, but they will not be as tolerant of a little echo as we are. So should we mandate ISDN as the best approach?
ISDN should make a sufficient difference in regards to echo. What echo canceller are you currently using for Zaptel?
Otherwise, are other FXO cards better at echo cancellation or is this a software feature built into the driver?
The Sangoma A200 cards with hardware echo cancellation are fantastic, and they work great under BSD.
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