Hello all, I'm contemplating upgrading a client's asterisk system from 1.0.9 to 1.2 beta to take advantage of some of the new echo cancellers in the later zaptel packages. Problem is, I'll be doing it without physical access to the box and without being able to personally test the new echo cancellation for them, so I'll be relying on information they provide me with. Their setup involves a Rev. I TDM400 card with 3 FXO modules connected to standard BT analogue lines. They've been complaining about echo for some time, despite the multitude of options I've tried in zapata.conf to limit the echo problem. Here are the current zapata.conf settings: echocancel=yes echocancelwhenbridged=yes echotraining=800 rxgain=12.0 txgain=8.0 (rxgain and txgain calculated by running ztmonitor on a number of different calls over a period of a few days, aiming to keep the levels in the middle) 1) Is an upgrade to 1.2 likely to help at all? 2) If yes, which echo canceller is most likely to yield favourable results, and are there any changes I should make in the conf file? Thanks in advance. Regards, Chris -- C.M. Bagnall, Director, Minotaur I.T. Limited This email is made from 100% recycled electrons
On Nov 13, 2005, at 8:36 AM, Chris Bagnall wrote:> Hello all, > > I'm contemplating upgrading a client's asterisk system from 1.0.9 > to 1.2 > beta to take advantage of some of the new echo cancellers in the later > zaptel packages. Problem is, I'll be doing it without physical > access to the > box and without being able to personally test the new echo > cancellation for > them, so I'll be relying on information they provide me with. > > Their setup involves a Rev. I TDM400 card with 3 FXO modules > connected to > standard BT analogue lines. They've been complaining about echo for > some > time, despite the multitude of options I've tried in zapata.conf to > limit > the echo problem. > > Here are the current zapata.conf settings: > echocancel=yes > echocancelwhenbridged=yes > echotraining=800 > rxgain=12.0 > txgain=8.0 > > (rxgain and txgain calculated by running ztmonitor on a number of > different > calls over a period of a few days, aiming to keep the levels in the > middle)Chris, Before you upgrade to 1.2 and potentially break a lot of things, have you followed the instructions available at <http://www.voip-info.org/ wiki/view/Asterisk+zapata+gain+adjustment> to adjust the rxgain and txgain? I can't say without testing the machine, but those levels look extremely high to me , and might be exacerbating, if not causing the echo problem. Try to adjust the gains quantitatively using milliwatt lines first before you go the upgrade route. Tom
I have personally done this recently, and my advice is definately DO IT. In my situation, I noticed a marked improvement in echo and general audio quality. I too had gain settings that were "out of whack" compared to what others had experienced, but as long as your following the documented methods (ztmonitor, etc.) then whatever works for you is fine. One word of warning though, when I went to 1.2Beta2, my gain settings were all out of kilter again. Calls were suddenly far too quiet. I ended up setting them all back to 0 (you'll need to perform your tests all over again). This may be because of the different default echo canceller in the Zaptel drivers? Anyway... good luck. =========================================Rod Bacon Empowered Communications Ground Floor, 102 York St. South Melbourne Victoria, Australia. 3205 Phone: +613 99401600 Fax: +613 99401650 FWD: 512237 ICQ: 5662270 ========================================= Chris Bagnall wrote:> Hello all, > > I'm contemplating upgrading a client's asterisk system from 1.0.9 to 1.2 > beta to take advantage of some of the new echo cancellers in the later > zaptel packages. Problem is, I'll be doing it without physical access to the > box and without being able to personally test the new echo cancellation for > them, so I'll be relying on information they provide me with. > > Their setup involves a Rev. I TDM400 card with 3 FXO modules connected to > standard BT analogue lines. They've been complaining about echo for some > time, despite the multitude of options I've tried in zapata.conf to limit > the echo problem. > > Here are the current zapata.conf settings: > echocancel=yes > echocancelwhenbridged=yes > echotraining=800 > rxgain=12.0 > txgain=8.0 > > (rxgain and txgain calculated by running ztmonitor on a number of different > calls over a period of a few days, aiming to keep the levels in the middle) > > 1) Is an upgrade to 1.2 likely to help at all? > > 2) If yes, which echo canceller is most likely to yield favourable results, > and are there any changes I should make in the conf file? > > Thanks in advance. > > Regards, > > Chris
Mojo with Horan & Company, LLC
2005-Nov-14 13:56 UTC
[Asterisk-Users] Upgrading 1.0.9 to 1.2 beta
I'd just work on upgrading the zaptel portion, don't do asterisk until you're ready. Swapping 1.0.9 for something in the 1.2.0 line went pretty painless for me, and asterisk couldn't care less as far as I can tell. I'm using 1.0.10 asterisk and 1.2.0rc2 zaptel. Moj Chris Bagnall wrote:> Hello all, > > I'm contemplating upgrading a client's asterisk system from 1.0.9 to 1.2 > beta to take advantage of some of the new echo cancellers in the later > zaptel packages. Problem is, I'll be doing it without physical access to the > box and without being able to personally test the new echo cancellation for > them, so I'll be relying on information they provide me with. > > Their setup involves a Rev. I TDM400 card with 3 FXO modules connected to > standard BT analogue lines. They've been complaining about echo for some > time, despite the multitude of options I've tried in zapata.conf to limit > the echo problem. > > Here are the current zapata.conf settings: > echocancel=yes > echocancelwhenbridged=yes > echotraining=800 > rxgain=12.0 > txgain=8.0 > > (rxgain and txgain calculated by running ztmonitor on a number of different > calls over a period of a few days, aiming to keep the levels in the middle) > > 1) Is an upgrade to 1.2 likely to help at all? > > 2) If yes, which echo canceller is most likely to yield favourable results, > and are there any changes I should make in the conf file? > > Thanks in advance. > > Regards, > > Chris-- Mojo <mojo@horanappraisals.com> Office Manger, Horan & Company, LLC (907) 747-6666 x112