Thanks for that, insightful The quality on both ends with those settings is quite good -- but the extension side still has a ridiculous -- almost duplicate -- echo!
If I turn the txgain right down, I lose all sound.....of course the signals in ztmonitor show up perfect then, but can't hear anything (DTMF tones too low or whatever...) Still wondering if it's an impedance issue...or something along those lines/chipset..etc.... I'm going to attempt upgrading Zaptel now, without upgrading the asterisk Chris ----- Original Message ----- From: "Chris Bagnall" <[EMAIL PROTECTED]> To: "'Chris Earle (CBL)'" <[EMAIL PROTECTED]>; "'Asterisk Users Mailing List - Non-Commercial Discussion'" <asterisk-users@lists.digium.com> Sent: Sunday, January 22, 2006 9:13 AM Subject: RE: [Asterisk-Users] Re: Connection TDM400P to UK PSTN > > Successfully got the adapters to allow the BT phones to ring > > on lines coming out of a TDM.......... but now my latest > > problem is echo. > > Suggestions / Experiences in UK appreciated > > Most of our clients with BT lines tend to have ISDN BRIs, but we do have one > in Northampton running 3 analogue lines from a TDM400. > > zaptel.conf is as follows: > fxsks = 1-3 > loadzone = uk > defaultzone = uk > > The TDM driver is loaded with opermode=UK and the output from dmesg confirms > this. > > Relevant settings from zapata.conf are as follows: > echocancel=yes > echocancelwhenbridged=yes > echotraining=800 > rxgain=8.0 > txgain=-4.0 > busydetect=yes > group = 1 > context = inbound > channel => 1-2 > group = 2 > context = inbound > channel => 3 > > They're running Asterisk/Zaptel 1.0.10. There were major echo issues when we > first deployed the system back in September, but some careful tweaking of > rxgain and txgain seems to have largely resolved the situation. Certainly my > experience has been that rxgain and txgain have far more impact on echo > reduction than any of the echo-specific settings. Get the gains right first, > then play with the echo-specific settings. > > Regards, > > Chris > -- > C.M. Bagnall, Director, Minotaur I.T. Limited > This email is made from 100% recycled electrons > > > > -- > This message has been scanned for viruses and dangerous content by > MailScanner, and is believed to be clean. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ --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