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
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