As I understand it, the echo cancelers in Asterisk only work with the
Analog cards (FXS/FXO). If you are getting echo on a digital line,
there is a problem with either a DAC, the T1 clocking, or you are
getting bit errors. You have a Switch in the middle - perhaps the
switch is doing doing digital-analog conversions instead of sending the
digital data straight through. The cause of the echo could very well be
there, and the echo cancelers (even if they worked on a digital line)
would not help because the cause of the echo is somewhere else, not at
the Digium card. Check your Tadiran switch for any echo cancel
options. I'm not familiar with that switch so I am no help to you on
that, but I am pretty sure that its not the Digium card or Asterisk.
Regards,
--Jason Bachman
Scott Gifford wrote:
Hello,
We're in the process of setting up an Asterisk server, and are having
echo problems. We have a Digium TE110P, and have tried the MG and
MARK2 AGGRESSIVE echo cancellers, with a variety of gain levels and
training times, and with both trunk and 1.2 branch versions of
Zaptel, Libpre, and Asterisk. In all cases, callers from the PSTN
hear their own voice echoed back after 1.5-2 seconds; none of these
adjustments made a difference, except adjusting gain made the echo
quieter.
We followed these instructions in trying to eliminate echo:
http://www.asteriskdocs.org/modules/tinycontent/content/docbook/current/docs-html/x1695.html
Our lines come in from the telco in a PRI, then connect to a Tadiran
switch which hands the lines off to Asterisk over a T1 card.
We have done loopback tests with the Digium card with a loop plug in
it.
We're a bit stumped as to what to try next. Any suggestions or
advice?
Thanks
---Scott.
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