Would you mind sharing with the list the tellabs hardware and how you got it up and running (ie pinouts etc)?<br>
<br>
<br><br><div><span class="gmail_quote">On 1/15/06, <b class="gmail_sendername"><a href="mailto:gw@adcomcorp.com">gw@adcomcorp.com</a></b> <<a href="mailto:gw@adcomcorp.com">gw@adcomcorp.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;">
Hello Dan,<br><br>I was fighting with echo on a number of circumstances, and came to the<br>following conclusions.<br><br>If you are on a distant loop, or analog lines with issues, those issues<br>need to be addressed or you need a workaround.
<br><br>In a few cases, I converted to ISDN-BRI, which has been one of my best<br>decisions, because I get excellent quality as well as high-speed call<br>completion...<br><br>In one case, I put in an ADIT 600 channel bank, and still had serious
<br>echo problems. I tried and tried, but found no simple solution by<br>messing with the zapata drivers. Installing a hardware tellabs echo<br>canceller totally solved the echo issue. I have the zapata.conf echo<br>cancellation totally off, and the lines sound great. These are also
<br>lines that are odd, meaning about 15K feet from the CO, with periodic<br>instabilities during rain/snow.<br><br>I went through the various tweaks, milliwatt tests, etc, but only the<br>hardware could solve it (and in minutes after installation as opposed to
<br>the hours I spend working with software).<br><br>Depending on the amount of channels you have, you may consider a<br>channelbank with tellabs, or one of the new digium analog cards with ec,<br>though I have not used the new digiums yet myself. They are expensive
<br>solutions, but the best solutions too.<br><br>I wish there were 4 port card that had great EC, but there isn't. I<br>wait for the day that we have pci-express voip cards at our disposal,<br>that would be something... Asterisk would take off entirely at that
<br>point, since the latencies that cause so many problems would be gone,<br>and the capacities would be so much higher.<br><br>Just in case I went over your head here, sip>sip should produce no echo.<br>If it does there are other issues. If you are going analog>analog and
<br>hear no echo, I would have a look at the network itself.<br><br>Regards,<br>Greg<br><br>-----Original Message-----<br>From: <a href="mailto:asterisk-users-bounces@lists.digium.com">asterisk-users-bounces@lists.digium.com
</a><br>[mailto:<a href="mailto:asterisk-users-bounces@lists.digium.com">asterisk-users-bounces@lists.digium.com</a>] On Behalf Of Dan Elder<br>Sent: Thursday, January 12, 2006 2:53 PM<br>To: <a href="mailto:asterisk-users@lists.digium.com">
asterisk-users@lists.digium.com</a><br>Subject: [Asterisk-Users] SIP phones unbeatable echo<br><br>Hey all again, I'm wrestling with echo problems on our sip extensions.<br>I've set these items in zapata.conf but tweaking these values doesn't
<br>seem to make much difference<br><br><br>echocancel=yes<br>echocancelwhenbridged=yes<br>echotraining=2500<br>rxgain=8.0<br>txgain=1.0<br><br><br>are there other settings that can help me tame this beast? Been<br>searching but not turning up anything that'll work here.
<br><br>Thanks in advance.<br><br>_______________________________________________<br>--Bandwidth and Colocation provided by <a href="http://Easynews.com">Easynews.com</a> --<br><br>Asterisk-Users mailing list<br>To UNSUBSCRIBE or update options visit:
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