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

[Fons van der Beek]

Perhaps irq sharing?

Royce Souther schreef:
> 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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