[asterisk-users] High Pitched Noise

[Rob Schall]

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?
>
> - Noah
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