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How do I fix echo over VoIP when a Digium card is in the call path?
For Zaptel channels, Asterisk has built in EchoCancellation.
To enable this you must edit your zapata.conf to read:

    echocancel=yes
    echotraining=yes   ; you may optionally enable echotraining as well

This only enables EchoCancellation on Zap channels. High txgain and/or rxgain will also contribute to Echo.

Also check this link for further Echo resolution:
I am hearing an echo. What can I do to fix this?
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