[asterisk-users] Customer complains of noise on line I cannot reproduce.

[Steve Totaro]

Check for IRQ issues, move the card to a different slot.

You could ask permission to record calls so maybe you can hear the
sound yourself.

I would then go ahead and swap out cards.  I have had TDM400 with bad
modules and also bad ports on the cards themselves, so it could a
hardware issue.

This is what I suspect, especially if you did not put any surge
suppression on your telco lines.  Usually, at least in my experience,
ticks or beeps indicate IRQ, hissing or loud static indicate something
with/on the board is bad.  ALWAYS use surge suppression on your lines!

Thanks,
Steve Totaro

On Wed, Feb 27, 2008 at 11:36 AM, Royce Souther <osgnuru at gmail.com> wrote:
> I have setup a few Asterisk systems for customers using Digium TDM400 cards
> and Aastra phones. No problems with sound quality at all except at this one
> site.
>
> Every time I try their system I don't hear any problems but they tell me
> that it is really bad. They describe it a a loud scratching sound.
>
> Are there any tests that can be done to pinpoint the problem? Has anyone
> seen this before? Are there known causes for this?
>
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