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<p class=MsoNormal><font size=2 color=blue face="Gill Sans MT"><span
style='font-size:10.0pt;font-family:"Gill Sans MT";color:blue'>Hi Rob –<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face="Gill Sans MT"><span
style='font-size:10.0pt;font-family:"Gill Sans MT";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face="Gill Sans MT"><span
style='font-size:10.0pt;font-family:"Gill Sans MT";color:blue'>Is it possible
to disable the onboard echo canceller so that one may try the software
cancellers instead?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face="Gill Sans MT"><span
style='font-size:10.0pt;font-family:"Gill Sans MT";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face="Gill Sans MT"><span
style='font-size:10.0pt;font-family:"Gill Sans MT";color:blue'>I have the
TE110P and am experiencing the same bad echo problems that I can’t seem
to effect by fiddling with the echo canceller settings in zconfig.h<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face="Gill Sans MT"><span
style='font-size:10.0pt;font-family:"Gill Sans MT";color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face="Gill Sans MT"><span
style='font-size:10.0pt;font-family:"Gill Sans MT";color:blue'>Cheers,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face="Gill Sans MT"><span
style='font-size:10.0pt;font-family:"Gill Sans MT";color:blue'>Mike.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face="Gill Sans MT"><span
style='font-size:10.0pt;font-family:"Gill Sans MT";color:blue'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Rob Lith<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, 12 February 2006
7:51 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Asterisk Users Mailing List -
Non-Commercial Discussion<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Asterisk-Users]
TE411P Really Bad Echo</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Sorry, that's correct -
so when experimenting with s/w echo can try the different options.<br>
<br>
Rob<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><span class=gmailquote><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>On 2/11/06, <b><span style='font-weight:bold'><a
href="mailto:asterisk@oneringnetworks.com">asterisk@oneringnetworks.com</a></span></b>
<<a href="mailto:asterisk@oneringnetworks.com">asterisk@oneringnetworks.com</a>>
wrote:</span></font></span><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I thought that if the VPM was detected then you didn't have any control
as to which algorithm was used.<br>
<br>
I was under the impression that the algorithms were only used for the software
echo cancellation.<br>
<br>
At this point I'll give anything a try. <br>
<br>
Stagg Shelton<br>
<a href="http://www.oneringnetworks.com">www.oneringnetworks.com</a><br>
<br>
-----Original Message-----<br>
<br>
From: Rob Lith <<a href="mailto:rob@connection-telecom.com">rob@connection-telecom.com
</a>><br>
Subj: Re: [Asterisk-Users] TE411P Really Bad Echo<br>
Date: Sat Feb 11, 2006 10:17 am<br>
Size: 4K<br>
To: Asterisk Users Mailing List - Non-Commercial Discussion<<a
href="mailto:asterisk-users@lists.digium.com"> asterisk-users@lists.digium.com</a>><br>
<br>
Stagg<br>
<br>
I don't think it's a matter of trying echocancel on and off, it is a matter<br>
of tuning your system to your local PSTN - this is a combination of trying<br>
the different echocan alogrithims ( i.e. MG2), the echotrainign etc and<br>
setting your txgain - too loud outgoing audio will result in echo.<br>
<a
href="http://www.asteriskdocs.org/modules/tinycontent/content/docbook/current/docs-html/x1695.html#AEN1718">http://www.asteriskdocs.org/modules/tinycontent/content/docbook/current/docs-html/x1695.html#AEN1718
</a><br>
<br>
Rob<br>
<br>
On 2/11/06, Stagg Shelton <<a href="mailto:asterisk@oneringnetworks.com">asterisk@oneringnetworks.com</a>>
wrote:<br>
><br>
> Yes, right now we are only using span 1 on the quad span card with plans <br>
> to pull in another T1 PRI when we get this echo problem solved. The
echo is<br>
> only experienced when the call terminates to traditional analog circuits<br>
> both local and long distance. Calls to cell phones, and other
known digital <br>
> circuits do not exhibit the symptoms. I've been sent a few
articles off<br>
> list which discussed the reasons why this may occur, imperfect impedance<br>
> where the digital circuit is switched to the analog circuit. <br>
><br>
> In testing I've set echocancel=no made calls, and echocancel=yes and made<br>
> calls with no real audible difference. I haven't done a zap
show channel<br>
> while on a call with echo, but I plan to this weekend. I was
informed that <br>
> the number of taps would be shown. I used a stop watch last
night to try to<br>
> get the delay, and it was about 1/2 to 1 second delay and was continual so<br>
> long as I was talking. It wasn't affected by differing
acoustical <br>
> variations. I tested this using handset, headset, and
speakerphone.<br>
> Disabling VPM and recompiling zaptel or removing the VPM off the board<br>
> completely is the only thing that has any effect on the
echo. Hopefully the <br>
> zap show channel will provide to me another data point to help me
determine<br>
> if the HW module is active.<br>
><br>
> More to come...<br>
><br>
> Stagg Shelton<br>
> <a href="http://www.oneringnetworks.com">www.oneringnetworks.com</a><br>
><br>
><br>
> Cory Andrews wrote:<br>
><br>
> Stagg - I know you get a full 128ms tail of echo can on the
Sangoma. I<br>
> believe that on the TE411P, the 128ms tail is shared by all (4) spans, and
<br>
> as you add additional spans up to maximum of 4, the echo can tail amount<br>
> decreases accordingly. If you are running 4 spans, you have
32ms of echo<br>
> can tail on each span, not the full 128ms.<br>
> <br>
> Now that I'm reading back through your post thread, it looks like you were<br>
> only running 1 span on the TE411P, so you should have been getting the
full<br>
> 128ms of echo can tail. You may not find an improvement with
the Sangoma. <br>
> I have never experience, nor heard of a 1-2 full second
delay. Trial and<br>
> error is likely your course of action.<br>
><br>
> Cory J Andrews<br>
> ++++++++++++<br>
> VOIPSupply.com<br>
> <st1:Street w:st="on"><st1:address w:st="on">454 Sonwil Drive</st1:address></st1:Street>
<br>
> <st1:place w:st="on"><st1:City w:st="on">Buffalo</st1:City>, <st1:State
w:st="on">NY</st1:State> <st1:PostalCode w:st="on">14225</st1:PostalCode></st1:place><br>
> ++++++++++++++<br>
> voice - 716.630.1555 X22<br>
> email - <a href="mailto:Cory@VOIPSupply.com">Cory@VOIPSupply.com</a><br>
> AIM - B2CORY<br>
><br>
> ----- Original Message ----- <br>
> *From:* Stagg Shelton <<a href="mailto:asterisk@oneringnetworks.com">asterisk@oneringnetworks.com</a>><br>
> *To:* Asterisk Users Mailing List - Non-Commercial Discussion<<a
href="mailto:asterisk-users@lists.digium.com"> asterisk-users@lists.digium.com</a>><br>
> *Sent:* Friday, February 10, 2006 11:34 PM<br>
> *Subject:* Re: [Asterisk-Users] TE411P Really Bad Echo<br>
><br>
> It was Digium's opinion that perhaps the card had a
VPM. We got a <br>
> replacement TE411P, I implemented it tonight and still the exact same echo<br>
> problem. At this point I feel like I can rule out failed
hardware.<br>
><br>
> I contacted Digium support and now they are telling me it's something with
<br>
> my carrier, and I should call them. I called Bellsouth, and
they ran a full<br>
> stress test on the circuit taking me offline for about 30 minutes.<br>
><br>
> The end result is that the circuit test passed with no
errors. Bellsouth <br>
> says it's not in their network, Digium says its not their card, and I have
a<br>
> te411p with VPM disabled in the wct4xx kernel module because something<br>
> doesn't work the way it should. My customer is wanting to know
about <br>
> sangoma cards with the echo cancellation, and at this point I'm nervous to<br>
> recommend any hardware. I'm going to look into the sangoma that
you<br>
> suggested. Are there any other kinds of products that I could
look into <br>
> either Passive or Active.<br>
><br>
> Thanks<br>
><br>
> Stagg Shelton<br>
> <a href="http://www.oneringnetworks.com">www.oneringnetworks.com</a><br>
><br>
><br>
> Matt wrote:<br>
><br>
> try sangoma carrier grade 104d hardware EC card. we're using it ourself. <br>
><br>
> Best Regards<br>
><br>
> Matt<br>
> ----- Original Message -----<br>
> From: "Anthony Rodgers" <<a
href="mailto:Anthony_Rodgers@dnv.org">Anthony_Rodgers@dnv.org</a>> <<a
href="mailto:Anthony_Rodgers@dnv.org"> Anthony_Rodgers@dnv.org</a>><br>
> To: "Asterisk Users Mailing List - Non-Commercial Discussion"<br>
> <<a href="mailto:asterisk-users@lists.digium.com">asterisk-users@lists.digium.com</a>>
<<a href="mailto:asterisk-users@lists.digium.com">
asterisk-users@lists.digium.com</a>><br>
> Sent: Tuesday, February 07, 2006 12:57 PM<br>
> Subject: Re: [Asterisk-Users] TE411P Really Bad Echo<br>
><br>
><br>
> For what it's worth, we have been going through
very similar issues <br>
> with a<br>
--- message truncated ---<br>
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