Sorry, that's correct - so when experimenting with s/w echo can try the different options.<br><br>Rob<br><br><div><span class="gmail_quote">On 2/11/06, <b class="gmail_sendername"><a href="mailto:asterisk@oneringnetworks.com">
asterisk@oneringnetworks.com</a></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;">
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>> 454 Sonwil Drive
<br>> Buffalo, NY 14225<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><br>_______________________________________________<br>--Bandwidth and Colocation provided by <a href="http://Easynews.com">Easynews.com</a> --<br><br>Asterisk-Users mailing list
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