[asterisk-users] [RESOLVED] One way audion on Sangoma

[Andrew Kohlsmith]

On Friday 25 August 2006 10:46, Michiel van Baak wrote:
> > "The Wanpipe TDM driver enables HW Echo Cancellation only on channels
> > that have active calls: It waits for zaptel to enable echo cancellation
> > after the call has been established. Therefore, Echo Cancellation option
> > MUST be enabled in /etc/asterisk/zapata.conf."
>
> Ah, then it's different from the digium cards.
> Sorry for the misinformation.

No, it's not.

Digium hardware echo cancellation cards also require you to say 
"echocancel=yes" in zapata.conf.  The zaptel driver recognizes that the card 
possesses echo cancellation hardware and does not engage the software echo 
canceller for those channels.

To summarize: if you want echo cancellation on Zaptel channels, you must 
enable it (echocancel=yes, or a number of taps) in zapata.conf.  If hardware 
echo cancellation exists, it is used over software echo cancellation.  Note 
that if hardware echo cancellation hardware is detected, the # of taps is 
ignored and the hardware uses whatever it has internally.

echocancel=no/off in zapata.conf will disable the echo cancellation in Zaptel, 
whether it is hardware-based or software-based.

-A.