[asterisk-users] High Pitched Noise

[Rob Schall]

Doubtful. I'm using the hardware echo cancel on the card. Any other
reasons the calls would get that noise and/or dropped right after
hearing the noise?

Rob


Eric "ManxPower" Wieling wrote:
> 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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