echo cancellation / suppression in chan_capi & isdn4bsd by HPS

[Michael Iedema]

Hello Hans Petter,

Thanks for the feedback on those questions!

> > - What is the value range for "echotail"? (32, 64, 128, 256?)
>
> Currently has no effect. It should set the number of samples or milliseconds
> that the echo cancel filter should cover.
>

Is this a i4b or chan_capi problem? I would like to implement this if
i4b can handle variably sized tails.

Regards,
-Michael