<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:12pt"><div>The echo between our extensions (using Polycom 550 handsets) disappears once I removed the Digium echo module. We are still experiencing some echo on land line calls, using dahdi to connect to our PRI circuit. <br><br>What kind of settings do you recommend for the "txgain and rxgain"? Do I make the gain changes in chan_dahdi.conf?<br><br>Thank you! <br><br>This is my system.conf:<br>===================================================<br># Span 1: WCT1/0 "Wildcard TE121 Card 0" (MASTER) <br>span=1,1,0,esf,b8zs<br># termtype: te<br>bchan=1-23<br>dchan=24<br>echocanceller=mg2,1-23<br><br># Span 2: WCTDM/0 "Wildcard AEX410 Board 1" <br>fxoks=25<br>echocanceller=mg2,25<br>fxoks=26<br>echocanceller=mg2,26<br>fxoks=27<br>echocanceller=mg2,27<br># channel 28, WCTDM/0/3, no
module.<br><br># Global data<br><br>loadzone = us<br>defaultzone = us<br></div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><br><br>This is my chan_dahdi.conf<br>============================================================<br>[trunkgroups]<br><br>[channels]<br>context=from-pstn<br>signalling=fxs_ks<br>rxwink=300 ; Atlas seems to use long (250ms) winks<br>usecallerid=yes<br>hidecallerid=no<br>callwaiting=yes<br>usecallingpres=yes<br>callwaitingcallerid=yes<br>threewaycalling=yes<br>transfer=yes<br>canpark=yes<br>cancallforward=yes<br>callreturn=yes<br>echocancel=yes<br>echocancelwhenbridged=no<br>faxdetect=incoming<br>echotraining=800<br>rxgain=0.0<br>txgain=0.0<br>callgroup=1<br>pickupgroup=1<br><br>;Uncomment these lines if you have problems with the disconection of your analog
lines<br>;busydetect=yes<br>;busycount=3<br><br><br>immediate=no<br><br>#include dahdi-channels.conf<br>#include chan_dahdi_additional.conf<br><div style="font-family: arial,helvetica,sans-serif; font-size: 13px;"><font size="2" face="Tahoma"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Noah Miller <noahisaacmiller@gmail.com><br><b><span style="font-weight: bold;">To:</span></b> Asterisk Users Mailing List - Non-Commercial Discussion <asterisk-users@lists.digium.com><br><b><span style="font-weight: bold;">Sent:</span></b> Tue, December 8, 2009 7:37:28 AM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [asterisk-users] Echo issue<br></font><br>
Hi -<br><br>> I am having echo issues on our Asterisk box using a PRI circuit. I was<br>> using the software echo cancellation and that helped a bit but didn't solve<br>> it completely. So I went and bought a Digium echo cancellation module for<br>> the TE121 card. That made it even worst, getting more echo on external<br>> calls and between internal extension to extension. The echo doesn't happen<br>> all the time, but enough to get complaints from our users.<br>><br>> Completely fed up with the issue, I removed the module from the card. Can<br>> someone guide me on how to fix/tune/address the echo issues.<br><br>You can likely eliminate most echo on a PRI by setting txgain and rxgain.<br><br>Are you using dahdi or zaptel? If Dahdi, what do your system.conf and<br>chan_dahdi.conf look like? If zaptel, what do your zaptel.conf and<br>zapata.conf look like?<br><br>When you say you have
echo on calls that are internal extension to<br>internal extension, are the endpoints using dahdi/zaptel or some voip<br>technology (sip, iax, mgcp, skinny, etc)? If voip, any echo is<br>acoustically generated by the endpoints themselves. On voip calls<br>I've often had this happen when the endpoints are using headsets, or<br>have gain levels set very high.<br><br><br>- Noah<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><br>asterisk-users mailing list<br>To UNSUBSCRIBE or update options visit:<br><span> <a target="_blank" href="http://lists.digium.com/mailman/listinfo/asterisk-users">http://lists.digium.com/mailman/listinfo/asterisk-users</a></span><br></div></div>
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