[Asterisk-Users] Faint background noise/crackle on FXS port on TDM400P

[Mark van Kerkwyk]

Hi, I have had this issues for ages but have ignored it, but my handsets 
get  faint background crackle on the FXS port. When I connect the handset 
directly into my PSTN, it goes away complete, so I am generating this from 
somewhere in my asterisk box. I get it immediately when the phone goes 
off-hook and it stays through the dialing and call progress.

I can't think of any other devices generating any interference along the 
line anywhere between the FXS port and my phone handset.

Any ideas ?

regards

Mark
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