Sounds like a classic case of the card being on the same IRQ as some other device in the system. "cat /proc/interrupts" will give you additional information. You'll have to move the card to a different slot if you find that it is sharing an IRQ.

Thomas Artner wrote:
hmm.. does really nobody had such an issue before?


Thomas Artner wrote:
Hi!

I am using asterisk with two tdm400p cards.
Sometimes (one call out of ten), when a call comes in and is taken,
there is some terrible noise for a short time in the line (for about a
second).
Both partys can hear the noise. And sometimes the call has to be hung
up, because the noise doesn't disappear.


Has anyone any idea where the problem could be?


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