<br>All : many thanks for your replies - I havent replied before as I was trying to get an environment where I can reproduce this echo. Only some progress so far.<br><br><br>A few questions re your comments:<br><br>- is there a way to disable via software the VPM module ? I take the suggestion of removing physically the board as interesting, unfortunately, the server is in a remote location with strict access conditions... if it could be done by software, that would be great<br>
<br>- I've upgraded to the latest dahdi (2.3.0) tonight, I will see if there are any improvements<br><br>- regarding echowhenbridge, echocancel, etc... do these parameters apply to hardware echo canceller as well ? my understanding was this applied only to software EC<br>
<br>- does anyone has a proper doc for this module ? <br><br><br>Many thanks for your precious help, <br><br>J.<br><br><br><div class="gmail_quote">On Thu, Apr 1, 2010 at 7:07 PM, John Bigelow <span dir="ltr"><<a href="mailto:jbigelow@digium.com">jbigelow@digium.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">I suggest to also upgrade DAHDI to the latest version which contains<br>
newer firmware for the VPMADT032.<br>
<font color="#888888"><br>
-John<br>
</font><div><div></div><div class="h5"><br>
Jean Cérien wrote:<br>
><br>
> Hello<br>
><br>
> I have the following setup:<br>
><br>
> Ast1.6.1.18+Chan-SS7 1.3 --> TE221 Board + VPMADT032 hw echo<br>
> canceller --> E1 to Mobile MSC E/// AXE10<br>
><br>
> I assume the hardware module is detected as the following message appears:<br>
> wcte12xp: VPM present and operational (Firmware version 117)<br>
><br>
> Calls are initiated via a SIP Client with G729, codec available on the<br>
> server.<br>
><br>
> On most of the calls, the quality is crystal clear - however, on some<br>
> specific numbers, there is a huge echo perceived on the SIP client.<br>
><br>
> This happens to some specific numbers, though 99%+ of the calls are ok<br>
> - all these numbers (with or without echo) are served by the same E1,<br>
> so nothing changes on my side. I am connected to a mobile GSM<br>
> operator, when I call this number from one of their cellphones, there<br>
> is no echo...<br>
><br>
><br>
> Any suggestions as what to check ?<br>
><br>
> Many thanks,<br>
><br>
> J.<br>
><br>
><br>
<br>
</div></div><div><div></div><div class="h5">--<br>
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