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

[Andrei (MPI)]

Try these settings in zapata.conf:

echocancel=64
echotraining=800
echocancelwhenbridged=yes
rxgain=3.2
txgain=-3.2

with default KB1 echo canceller in zconfig.h

This setup was working fairly okay for me for about a year or so.

Also, notice that at the first seconds of the call you may hear some 
echo, but then it disappears. I just trained myself to ignore this first 
seconds echo. =)

Please give the list information regarding the phone that you use with 
*. This maybe a cheap phone problem, as well.

Andrei (MPI)

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.
>
>
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