[Asterisk-Users] Echo in CAPI channels

[steve at daviesfam.org]

> >Hi,
> >
> >who does this echo canceling if you use ordinary ISDN phone (you hear no
> >echo) ?
> >
> >Regards,
> >
> >robert.


Often noone.  But you don't notice it because the delay is so low.  So it 
just sounds like "sidetone" - where the phone plays some of your voice 
back in your ear.

When you start using SIP (and, to some extent, even Asterisk itself) then 
delay gets longer and you start to notice the echo.

Steve