Brian,
You may actually get better results lowering size of the buffer. Here
are my settings that have been working nice so far on TDM400 (1+ year):
echocancel=64
echotraining=800
echocancelwhenbridged=yes
rxgain=2.0
txgain=-4.0
Notice difference between receive and transmit levels. That's essential,
too.
Andrei (MPI)
Brian Swan wrote:
I've spent the last week or so troubleshooting echo problems at my
Wife's business, and I've been able to clear up about 99% of the echo,
but there is still a little residual echo that I can't seem to "tweak
out". The users describe it as "buzzing or crackling", but what it
sounds like to me is a slight echo, but just of one syllable of the word.
I've followed the numerous suggestions in the mailing list archives
which is what has enabled me to get this far. After trying all the
echo cancelers, and all the settings on each I settled on:
- KB1 (with AGGRESSIVE_SUPRESSOR)
- echocancel=128
- echotraining=600
- rxgain=0
- txgain=0
If I turned up the echocancel to 256 I'm able to eliminate the
"buzzing" echo, however, on inbound calls I get a HUGE very loud echo
that takes a good 20 seconds to go away (which I don't get on
echocancel=128). Does anyone have any suggestions on how
troubleshoot/tune this to eliminate the "buzz"?
Here's my setup:
Asterisk 1.2.9.1
Zaptel 1.2.6
TDM400P (3xFXO, 1xFXS)
6 Cisco 7960's running chan_sccp2
Along the same lines, in my hunt for echo, I was rather disappointed
that I couldn't really find any tools to help troubleshoot the issue.
It seemed like the general consensus was "Play with all the settings
until it sounds good". I did manage to compile the Zaptel driver with
the Zaptel "preload" patch, which helped me visualize my echo problems
a bit, but preloading didn't get rid of the buzz. Also, I've
eliminated inside wiring by moving the Asterisk box to my demarc to
test, I also tried the TDM400P on different hardware to ensure it's
not a motherboard issue. But, at the end of the day, those are all
just stabs in the dark...
If anyone has any suggestions, I'd sure appreciate it!
Thanks!
Brian
_______________________________________________
--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
