<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:10pt"><div>I too, had really bad echoes on a TE121 w/ echo module. When I removed the module, I haven't had as much echoes as before.<br></div><div style="font-family: times new roman,new york,times,serif; font-size: 10pt;"><br><div style="font-family: arial,helvetica,sans-serif; font-size: 13px;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Sascha Ferley <sascha.ferley@infineon.net><br><b><span style="font-weight: bold;">To:</span></b> asterisk-users@lists.digium.com<br><b><span style="font-weight: bold;">Sent:</span></b> Sun, May 16, 2010 12:00:31 PM<br><b><span style="font-weight: bold;">Subject:</span></b> [asterisk-users] Digium TE121P + DAHDI<br></font><br>
Hi, <br><br>Just trying to figure out / solve some echo issues with one of our systems.<br>The server is a Dell R710 running Asterisk 1.6.x and Dahdi 2.2.x<br>The card in the server is a TE121P (with VPMADT032 echo canceller)<br><br>We are experiencing some weird echo issues with our Cisco 79xx phones, only<br>when we are dialing out via the PRI. The echo is like a side tone, where we<br>can hear ourselves speaking. The other party doesn't hear this however and<br>its perfectly clean.<br><br>After solving some of the IRQ/processing issues in which we seemed to get<br>HDLC errors pop up after a week and take down the connection completely<br>(only solvable with a reboot); we changed the smp_affinity settings for all<br>devices to basically run on their own core.<br>This seemed to have solved us getting extended IRQ misses and increase in<br>delays. However it hadn't fixed the echo issue.<br><br>After some digging on this it seems that there could be a
problem with DAHDI<br>and I want to get to the bottom of it.<br>Reference: <a href="https://issues.asterisk.org/view.php?id=15724" target="_blank">https://issues.asterisk.org/view.php?id=15724</a><br><br>In my dmesg logs I see that dahdi loads the MG2 echo canceller, is this<br>correct? I thought that the dahdi firmware for VPMADT032 would take care of<br>that. Thus I want to insure that we are actually using the hardware module<br>for echo cancellation and not some software canceller, which is acting<br>sub-par. <br><br>If this is correct, is there any solution to this problem sofar?<br><br>Thanks<br><br>S.<br><br><br><br>-- <br>_____________________________________________________________________<br><span>-- Bandwidth and Colocation Provided by <a target="_blank" href="http://www.api-digital.com">http://www.api-digital.com</a> --</span><br>New to Asterisk? Join us for a live introductory webinar every Thurs:<br><span>
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