[Asterisk-Users] TDM400P bad echo problem, tried lots of things

[news.asterisk.users]

I was having this issue - though a DSL filter was the root cause.
Here is what I did to erradicate echo:
Upgrade to newest zaptel/libpri.
cd  /usr/src/
mv zaptel zaptel.old
mv libpri libpri.old
svn checkout http://svn.digium.com/svn/zaptel/trunk zaptel
svn checkout http://svn.digium.com/svn/libpri/trunk libpri

cd zaptel
|# cd zaptel
# make clean; make install; make config
# cd ../libpri
# make clean; make install
|
cat /etc/fxotune.conf
cd zaptel
amportal stop
./fxotune -d -b <fxoport ie 1,2,3,or 4>
./fxotune -d -b <fxoport> -w 1004
./fxotune -i 5 -t 1
./fxotune -d -b <fxoport> -w 1004
./fxotune -i 5
./fxotune -s
amportal start
cat /etc/fxotune.conf

This assumes you're using asterisk management portal or freepbx.

Good luck.

JD
Carey O'Shea wrote:
> I have a bad echo problem on my TDM400P with one FXO module installed.
>
> I have tried a few things, such as:
>
> * setting rxgain and txgain to 0
> * setting echocancelwhenbridged to no / yes
> * settting echocancel to 64 / no / yes
> * setting echocanceltraining to 800 / no / yes
> * MG2 echo cancellation
> * MARK2 echo cancellation
> * KB1 echo cancellation
> * AGGRESSIVE_SUPPRESSOR option of MARK2
>
> Each time restarting Asterisk, then opening the Zap channel, and then
> speaking...only to hear my self played back almost instantly. 
>
> None of these options changed the echo for me, it always sounded the
> same -- except for the AGGRESSIVE_SUPPRESSOR option, in which every time
> I spoke it made the other end a very low volume, so much that I couldn't
> hear the other end (ie: not useful).
>
> I don't have this problem with pure IP calls, it's only with my TDM400P
> and FXO that I have this echo problem. This means my headset and IP
> phones are fine (of course).
>
> So, what else can I try? :-)
>
> Any ideas why this is so consistent and persistent? Maybe it's something
> to do with my phone cable or something of that nature (hmm?)?
>
> Any input appreciated.
>
> Thanks,
> Carey O'Shea.
>
>
> _______________________________________________
> --Bandwidth and Colocation provided by Easynews.com --
>
> Asterisk-Users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
>   

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20060621/cddc98d0/attachment.htm