Echocancel values

What do these echocancel values mean?

32
64
128
256

number of taps. The higher the number, the bigger echo it can cancel (big = time between the sound and its echo).

Ok. Thanks.

What about echotraining values:
200
400
800

Echotraining mute the chan during then number of milliseconds you choose then it send impulse to test the echo.

The higher the training is, the better the echocancel is at the beginning of the call. But a too high training cause the channel to be muted too log for nothing.