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
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