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

[Matthew Fredrickson]

Try fxotune.  That's the first thing you should have used.

Matthew Fredrickson

On Jun 20, 2006, at 11:55 AM, 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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