[Asterisk-Users] Echo canceller data-points

[Steve Davies]

Here is the patch file which I use (I manually removed some other
parts of the patch, so I hope it is okay!) - It should be sufficient
to get you going.

cd into the zaptel-1.0.9.2 source directory, and
patch -p1 <zap-patch.txt

Cheers,
Steve

On 3/15/06, Colin Anderson <ColinA at landmarkmasterbuilder.com> wrote:
> Is it onerous to backport or is it a case of fiddling around with the
> makefile? Care to post a backported tar?
>
> -----Original Message-----
> From: Steve Davies [mailto:davies147 at gmail.com]
> Sent: Wednesday, March 15, 2006 2:47 PM
> To: asterisk-users at lists.digium.com
> Subject: [Asterisk-Users] Echo canceller data-points
>
>
> In case this is useful to someone...
>
> Initially running * 1.0.7 and the default canceller, about 1 in 20 E1
> PRI calls still had echo, sometimes quite bad.
>
> Updated to * 1.0.9, and backported KB1 from 1.2 HEAD to this build -
> No noticable change over the previous version, but we ran with it
> anyway as the small changes in the EC code looked sensible.
>
> Recently we backported MG2 from Zaptel 1.2.4 into our * 1.0.9 build,
> and noticed a significant improvement.
>
> I thought I would try the 1.2 trunk/HEAD version of MG2 with the extra
> knobs and whistles, but found 2 problems. This version trains even a
> normally clean line in about 10 seconds, rather than instantly, and
> its CPU usage is through the roof compared to the 1.2.4 version of the
> code. (FYI I got very similar resuls at all intermediate SVN versions
> of the MG2 canceller between 1.2.4 and HEAD)
>
> My advice: Go with the 1.2.4 MG2 echo canceller, perhaps if you have
> plenty of spare CPU the newer code will become useful, but I could not
> cancel even 20 PRI channels using a 1GHz processor on the latest code
> - I got clicks, buzzing and eventually a dead PRI. With the 1.2.4
> branch I had 40% CPU free when cancelling 30 channels.
>
> Hope this helps.
>
> Cheers,
> Steve
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