[asterisk-users] Zapata/DAHDI Disable Hardware echo canceler based on SDA number / displan

[Johann Steinwendtner]

Kevin P. Fleming wrote:
> Benoit Plessis wrote:
>> Is it possible on a TE220p to deactivate the hardware echo canceler at 
>> will ? (With a function in the dialpan for example)
>> example for fax SDA ,beeing able to shutdown the echo canceler could 
>> give better results don't you think ?
> 
> All echo cancelers using Zaptel/DAHDI already disable themselves when
> FAX or modem communications are used, based on reception and detection
> of the CED tone that FAX machines and modems generate to make that
> happen. You can tell this happened by looking at the channel in Asterisk
> using 'zap show channel' or 'dahdi show channel' as it will show you
> that the echo canceler was disabled automatically.
> 
I thought the ec gets disabled only by the ec disable tone and not the CED tone.



regards

Hans