[Asterisk-Users] Echo in CAPI channels

[Robert Rozman]

Hi,

who does this echo canceling if you use ordinary ISDN phone (you hear no
echo) ?

Regards,

robert.

----- Original Message ----- 
From: <steve at daviesfam.org>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users at lists.digium.com>
Sent: Friday, October 29, 2004 1:12 PM
Subject: Re: [Asterisk-Users] Echo in CAPI channels


>
>
> On Fri, 29 Oct 2004, Derek Conniffe wrote:
>
> > I also get echo also but whats interesting is that I only get an echo if
> > the person at the far end (via. the telephone company) is using an
> > analogue phone line.  If they are on ISDN or a cell phone there is no
echo.
> >
> > I'm only using basic ISDN (not primary rate) connections with chan_capi
> > and AVM Fritz PCI cards.  I'd love to hear how to fix this.
> >
> > Derek
>
>
> Hi Derek,
>
> Your practical experience exactly matches the theory.
>
> "Electrical echo" can be introduced when digital or 4-wire connections are
> converted to two wire.
>
> ISDN and cell-phone is all digital.
>
> As for fixing it with chan_capi - not so easy.  The latest chan_capi
> (0.3.5) has only a very basic echo cancellation - configured using
> "echosquelch" or "echocancel" in capi.conf.  You could try adjusting
> those and see if it helps.
>
> Steve
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