[asterisk-users] Half-duplex call on TDM2400p with VPMADT032

[Ruben Zamora]

Hi,
I have a same problem, last week i was working with TE120 with a little 
echo in some call,  I replace the card
with a TE122B ( Included Echo Cancelation VPMADT032) and there was no 
more echo in my call.

But know i have de same probelm with my incoming audio stream gets 
clipped / dropped when you speak.

Thanks
Ruben

Lex Lethol escribió:
> Hi,
>
> I've used all kinds of digium cards without troubles.  My last
> installation is using a TDM2400p with VPMADT032 echo cancel module and
> after a week of use we noticed that any incoming audio stream gets
> clipped / dropped when you speak or when ambient noise is high.  The
> call basically feels as in a half-duplex channel, but only to the
> person behind our asterisk.  I found a quick way to recreate by
> placing a call using zapata channel, someplace that has an audio
> stream (ie. music on hold from another pbx).  When one talks into the
> phone, one can notice the incoming audio getting muted until you stop
> talking.
>
> First I thought it had to do with polycom configuration although we
> use the same setup for all installations (VAD, etc), but the same
> happens with other sip phones and after more tests I can only recreate
> this using the TDM2400p's FXO trunks.  I have an older TDM2400p with
> no VPMADT032 in production (without this problem), this leads me to
> believe there maybe something wrong with VPMADT032 module or with my
> card in particular.
>
> Today I rebuilt everything from scratch using latest asterisk 1.2
> release, rechecked with the TDM2400p manual zapata configs just to
> make sure I wasn't missing something.  As the manual suggests, I am
> just using echocancel=yes and this should set 128 default value for
> the card.  In the general zapata options there we have
> echocancelwhenbridged=yes.  I have played with all yes/no combinations
> without luck.
>
> Interrupts and timing stuff are OK, we have good incoming and outgoing
> audio quality (as long as its not at the same time).
>
> Anyone else using this card showing the same problems?
>
> Any zaptel/asterisk gurus wanna take a shot at this?
>
> Thanks in advance for your feedback/comments.
>
> Lex
>
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