David Caldwell wrote:
> Hi all,
>
> I think my echo problem might be due to a very long cable run from the
> TDM cards to the phone socket. I will relocate the Astlinux server and
> test for echo again.
>
> In the meantime, I've been trying to find a tool called 'ztmonitor'
> mentioned in a number of articles about echo and gain used for tweaking
> the Zap cards. Is this included with Astlinux or is there an alternative
> I can use?
>
David,
How long of a cable run are we talking about here? While I don't have
a ton of experience with echo (I RARELY encounter it at all), the TDM400
seem like they have a lot of echo problems.
Are you in the UK? Are you sure that your zone settings are correct?
What about the settings for the card/modules itself? I know there are
some options that you can pass at module load time to make sure that the
card matches the impedance of the line in the country that you are in.
As far as ztmonitor, I have modified the zaptel.mk file to install it
by default (rev 171). Also, I have uploaded a version you can try:
http://www.krisk.org/asterisk/ztmonitor
It's sha1 is:
f69d55c68fd30eb1319e2500677ab4c8d4c6791d ztmonitor
--
Kristian Kielhofner
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