what happens when you drop your gains? use /etc/asterisk/zaptel.conf and fiddle with tx and rx values. Works, most of the time.
-----Original Message----- From: John McEntee [mailto:[EMAIL PROTECTED] Sent: Wednesday, October 11, 2006 12:25 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: [asterisk-users] Echo problems on ISDN. (mainly incoming calls) OK I have been battling with echo problems with asterisk on ISDN for a few weeks now, and still can't solve it (although I think I have tried everything I can find.) I will try a post everything I think is possibly relevant that I can remember with the hope someone can point me in the right direction. current spec I am using (Trixbox 1.0 was still in beta at the time an didn't detect the TE110 card, and modules didn't load properly when I tried manually either ) [EMAIL PROTECTED] 2.8 Wildcard TE110P ISDN PRI card (set to E1, I live in the UK) Telewest Q931 ISDN connection (currently 8 lines 100 phone numbers) dell SC1425 server (3.2 Ghz, 512MB, 80GB) SIP phones aastra 9133i run 1.4.0 firmware. This is on a live system with about 50 users. (I have a identical system for DR so can easily test out of hours) Most the time there is no echo, If I phone my wife (on a normal telewest analog line) I get a slight echo (fairly quiet) that she does not noticed. This happens on other phone calls but the user can tolerate this (would prefer to solve it) If a big customer (one with several thousand employees) phones me, I can hear a very loud echo with an annoying delay (0.5-1.0 sec, ish), which the users cannot tolerate. The customer does not get the echo, currently the user phones back? Any suggestion on How to solve the echo problems? I have tried with echo cancellation at 800 and changing the RX and TX gains to no effect. I have read that ISDN should not have echo problems and that may I sould ask about the gains on the line provided by the telco. Can anyone give me more information about this as if I phone Telewest I want to pretend that my PBX supplier has told me to ask XXX. As the first thing they ask me is to contact my my PBX supplier (I had a slight problem getting the ISDN card to initially connect) Thanks John _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
