Could you be having ECFO? See:
http://lists.digium.com/pipermail/asterisk-dev/2006-August/022062.html
http://lists.digium.com/pipermail/asterisk-dev/2006-August/022111.html
Rob Schall wrote:
This is a PRI 24 channel line. We have backup pots lines, but they
aren't in use. The problem we were having was happening on only a single
channel or 2.
Rob
Noah Miller wrote:
Hi Rob -
After about having the server running for about an hour, our callers
occationally hear a high pitched beep that lasts the entire call. In
some cases, the noise doesn't start until a minute or 2 into the call,
while others last the entire call. In some of the more serious cases,
calls are dropped after the noise has occurred as well.
Another symptom has been really bad static on a specific channel. After
reseating the card to try to fix both this as well as the problem above,
the problem usually goes away, but it seems to come back quicker each
time. Also, the channel that the static occurs on changes after each
reseating (after some time).
What kind of PSTN lines are they? If they're POTS lines, can you plug
a regular phone in and test the noise then? Also have you looked at
other hardware devices inside the asterisk box? I've heard disk
drives (hard, floppy, optical) that make loud enough noises that they
interfere with analog phone lines. Do you have another machine to
test the card in?
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