More by trial and error, we backed off the gain until it disappeared but with no detriment to the call quality (didn't want people to sound like a whisper).
Our situation was somewhat different to yours though, we were seeing the issues on calls from our PBX, not on calls through the IP phones. Who hears the echo, the IP phone user or the remote user? Steve -----Original Message----- From: Asterisk [mailto:[EMAIL PROTECTED] Sent: 13 December 2004 12:36 To: 'Asterisk Users Mailing List - Non-Commercial Discussion' Subject: RE: [Asterisk-Users] Echo on one E1 line, but not the other Both ISDN lines are going into the same * box - span 1 is the "test" isdn line and span 3 is the "live" isdn line. The two ISDN lines are situated right next to each other! As mentioned there is no problem with the test line, so there isn't a problem with * as such (I don't think!). Perhaps I haven't got the configuration quite right. When you say that you adjusted the gain, is that the tx/rx settings in zapata.conf ? How did you determine the correct settings: by placing a call and monitoring using ztmonitor ? Thanks. Julian -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Steve Hanselman Sent: 13 December 2004 12:13 To: '[EMAIL PROTECTED]'; 'Asterisk Users Mailing List - Non-Commercial Discussion' Subject: RE: [Asterisk-Users] Echo on one E1 line, but not the other It looks like this is a splice between a couple of ISDN-30 lines and one or more PBX's? Are they both with the same provider, or with different providers? We ended up adjusting the gain our ours as we would hear a distinct echo on certain calls. Other than that, you'll need to do the usual tests, check for shared interrupts, also, see if disk activity causes a problem. (check /proc/interrupts for shared interrupts). Have you also checked the output of the pri commands to ensure that you're not getting line errors? Steve -----Original Message----- From: Asterisk [mailto:[EMAIL PROTECTED] Sent: 13 December 2004 12:04 To: 'Asterisk Users Mailing List - Non-Commercial Discussion' Subject: [Asterisk-Users] Echo on one E1 line, but not the other We're rolling out Cisco 7940 phones, linked to *, which is running a TE405p EuroISDN. We have 2 ISDN lines, one we had for testing, and one for general (40+ users) use. During the testing phase, we had 10 phones linked to the second ISDN line, and there were no problems with echo at all. Lucky me. However, since we have started rolling out, we've had quite loud complaints that there is "a terrible echo". If I direct my 7960 to use the primary line, there is an echo. If I use the second line (dialling the same external number) there is no echo at all. What could be the issue ? I have noticed on the primary line there is a "detected rx/tx on channel xx, echo cancellation disabled" (or something like that. Is this the cause ? We have several fax / modems going through the line - should I always dedicate a channel to them ? I've included my zaptel.conf and zapata.conf file below. Any help / comments appreciated. # # Zaptel Configuration File # # This file is parsed by the Zaptel Configurator, ztcfg # span=1,1,0,ccs,hdb3,crc4 bchan=1-15,17-31 dchan=16 span=2,0,0,ccs,hdb3,crc4 bchan=32-46,48-62 dchan=47 span=3,2,0,ccs,hdb3,crc4 bchan=63-77,79-93 dchan=78 span=4,0,0,ccs,hdb3,crc4 bchan=94-108,110-124 dchan=109 loadzone=uk defaultzone=uk ############################################# ;zapata.conf [general] [trunkgroups] [channels] musiconhold=default language=en rxwink=300 ; Atlas seems to use long (250ms) winks usecallerid=yes hidecallerid=no callerid=asreceived callwaiting=yes usecallingpres=yes callwaitingcallerid=yes useincomingcalleridonzaptransfer=yes threewaycalling=yes transfer=yes cancallforward=yes callreturn=yes echocancel=yes echocancelwhenbridged=yes echotraining=yes echotraining=800 ;relaxdtmf=yes rxgain=0.0 txgain=0.0 ;callgroup=1 ;pickupgroup=1 ;adsi=yes context=isdn32-b pridialplan=unknown group=1 signalling=pri_cpe switchtype=euroisdn channel=1-15,17-31 context=meridian-b group=2 signalling=pri_net switchtype=euroisdn channel=32-46,48-62 context=isdn32-a pridialplan=unknown group=3 signalling=pri_cpe switchtype=euroisdn channel=63-77,79-93 context=meridian-a group=4 signalling=pri_net switchtype=euroisdn channel=94-108,110-124 _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users The information contained in this email is intended for the personal and confidential use of the addressee only. It may also be privileged information. If you are not the intended recipient then you are hereby notified that you have received this document in error and that any review, distribution or copying of this document is strictly prohibited. If you have received this communication in error, please notify Brendata immediately on: +44 (0)1268 466100, or email '[EMAIL PROTECTED]' Brendata (UK) Ltd Nevendon Hall, Nevendon Road, Basildon, Essex. SS13 1BX UK Registered Office as above. Registered in England No. 2764339 See our current vacancies at www.brendata.co.uk _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users The information contained in this email is intended for the personal and confidential use of the addressee only. It may also be privileged information. If you are not the intended recipient then you are hereby notified that you have received this document in error and that any review, distribution or copying of this document is strictly prohibited. If you have received this communication in error, please notify Brendata immediately on: +44 (0)1268 466100, or email '[EMAIL PROTECTED]' Brendata (UK) Ltd Nevendon Hall, Nevendon Road, Basildon, Essex. SS13 1BX UK Registered Office as above. Registered in England No. 2764339 See our current vacancies at www.brendata.co.uk _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users