Stagg<br><br>I don't think it's a matter of trying echocancel on and off, it is a matter of tuning your system to your local PSTN - this is a combination of trying the different echocan alogrithims (i.e. MG2), the echotrainign etc and 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><div><span class="gmail_quote">On 2/11/06, <b class="gmail_sendername">Stagg Shelton</b> <<a href="mailto:asterisk@oneringnetworks.com">asterisk@oneringnetworks.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Yes, right now we are only using span 1 on the quad span card with
plans to pull in another T1 PRI when we get this echo problem solved.
The echo is only experienced when the call terminates to traditional
analog circuits both local and long distance. Calls to cell phones,
and other known digital circuits do not exhibit the symptoms. I've
been sent a few articles off list which discussed the reasons why this
may occur, imperfect impedance 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 calls with no real audible difference. I haven't done a zap show
channel while on a call with echo, but I plan to this weekend. I was
informed that the number of taps would be shown. I used a stop watch
last night to try to get the delay, and it was about 1/2 to 1 second
delay and was continual so long as I was talking. It wasn't affected
by differing acoustical variations. I tested this using handset,
headset, and speakerphone. Disabling VPM and recompiling zaptel or
removing the VPM off the board completely is the only thing that has
any effect on the echo. Hopefully the zap show channel will provide to
me another data point to help me determine if the HW module is active.<br>
<br>
More to come...<span class="q"><br>
<br>
Stagg Shelton<br>
<a href="http://www.oneringnetworks.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">www.oneringnetworks.com</a><br>
<br>
<br></span>
Cory Andrews wrote:
<blockquote cite="http://mid0ae601c62ec6$d7436b80$0600000a@cory" type="cite"><div><span class="e" id="q_1095976f3a58041d_3">
<div><font face="Arial" size="2">Stagg - I know you get a full 128ms
tail of echo can on the Sangoma. I believe that on the TE411P, the
128ms tail is shared by all (4) spans, and as you add additional spans
up to maximum of 4, the echo can tail amount decreases accordingly. If
you are running 4 spans, you have 32ms of echo can tail on each span,
not the full 128ms.</font></div>
<div> </div>
<div><font face="Arial" size="2">Now that I'm reading back through
your post thread, it looks like you were only running 1 span on the
TE411P, so you should have been getting the full 128ms of echo can
tail. You may not find an improvement with the Sangoma. I have never
experience, nor heard of a 1-2 full second delay. Trial and error is
likely your course of action. </font></div>
<div> </div>
<div>Cory J Andrews<br>
++++++++++++<br>
VOIPSupply.com<br>
454 Sonwil Drive<br>
Buffalo, NY 14225<br>
++++++++++++++<br>
voice - 716.630.1555 X22<br>
email - <a href="mailto:Cory@VOIPSupply.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">Cory@VOIPSupply.com</a><br>
AIM - B2CORY</div>
<blockquote style="border-left: 2px solid rgb(0, 0, 0); padding-right: 0px; padding-left: 5px; margin-left: 5px; margin-right: 0px;">
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none;">-----
Original Message ----- </div>
<div style="background: rgb(228, 228, 228) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none;">
<b>From:</b>
<a title="asterisk@oneringnetworks.com" href="mailto:asterisk@oneringnetworks.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">Stagg Shelton</a> </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none;"><b>To:</b>
<a title="asterisk-users@lists.digium.com" href="mailto:asterisk-users@lists.digium.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">Asterisk Users Mailing
List - Non-Commercial Discussion</a> </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none;"><b>Sent:</b>
Friday, February 10, 2006 11:34 PM</div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none;"><b>Subject:</b>
Re: [Asterisk-Users] TE411P Really Bad Echo</div>
<div><br>
</div>
It was Digium's opinion that perhaps the card had a VPM. We got a
replacement TE411P, I implemented it tonight and still the exact same
echo 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 my carrier, and I should call them. I called Bellsouth, and they
ran a full 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 says it's not in their network, Digium says its not their
card, and I have a te411p with VPM disabled in the wct4xx kernel module
because something doesn't work the way it should. My customer is
wanting to know about sangoma cards with the echo cancellation, and at
this point I'm nervous to recommend any hardware. I'm going to look
into the sangoma that you suggested. Are there any other kinds of
products that I could look into either Passive or Active.<br>
<br>
Thanks <br>
<br>
Stagg Shelton<br>
<a href="http://www.oneringnetworks.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">www.oneringnetworks.com</a><br>
<br>
<br>
Matt wrote:
<blockquote cite="http://mid003001c62c66$8adaf6d0$0301a8c0@bbzlsgmfs2be6y" type="cite">
<pre>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" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
<Anthony_Rodgers@dnv.org></a><br>To: "Asterisk Users Mailing List - Non-Commercial Discussion"<br><a href="mailto:asterisk-users@lists.digium.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
<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> </pre>
<blockquote type="cite">
<pre>For what it's worth, we have been going through very similar issues<br>with a TE411P - with Digium support, we have basically gone as far as<br>we can with the HW EC, and are now using MG2 with much better results.
<br><br>We have a Ditech EC box on order.....<br><br>Regards,<br>-- <br>Anthony Rodgers<br>Business Systems Analyst<br>District of North Vancouver<br>Web: <a href="http://www.dnv.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://www.dnv.org</a><br>RSS Feed: <a href="http://www.dnv.org/rss.asp" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">http://www.dnv.org/rss.asp</a><br><br><br>On Feb 7, 2006, at 7:36 AM, Matthew Fredrickson wrote:
<br><br> </pre>
<blockquote type="cite">
<pre>On Feb 5, 2006, at 9:36 PM, Stagg Shelton wrote:<br><br> </pre>
<blockquote type="cite">
<pre>I just implemented a system using a TE411P hardware echo cancellation<br>card. Per Digium, I setup zaptel.conf, and zapata.conf the same way<br> </pre>
</blockquote>
<pre>as<br> </pre>
<blockquote type="cite">
<pre>I always have. To my surprise calls out to the PSTN had a terrible<br>echo. 1 - 2 second delay, and quite clear. The echo was so bad that<br> </pre>
</blockquote>
<pre>I<br> </pre>
<blockquote type="cite">
<pre>had to remove the hardware echo cancellation module from the card.<br> </pre>
</blockquote>
<pre>We<br> </pre>
<blockquote type="cite">
<pre>are only using the 1st span of this card right now, and we have a<br>tdm400p with 4 fxs modules installed as well.<br><br>If anyone has experience with this card, can you tell me if I am<br>missing<br>something.
<br> </pre>
</blockquote>
<pre>1 to 2 seconds?! That's ridiculously huge. I don't think you'll find<br>a echo canceler anywhere that can fix your echo problem. If it gets<br>better with the VPM disabled, then definitely contact Digium<br>
tech-support about it.<br><br>Matthew Fredrickson<br><br>_______________________________________________<br>--Bandwidth and Colocation provided by <a href="http://Easynews.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
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