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

[Matthew Fredrickson]

Ruben Zamora wrote:
> 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.

Please contact Digium technical support about this.  This is definitely 
something that we need to work with the vendor of the echo canceller IP 
about.

Matthew Fredrickson

> 
> 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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-- 
Matthew Fredrickson
Software/Firmware Engineer
Digium, Inc.