3x FXO lines from a standard telecom provider no VOIP
When people are making and receiving calles they don't come in clear. I can confirm that on a few occasions I called in and when listening to the Voice Prompts of the auto attendant I could hear the static/cracks
I have done the FXO impedance matching
Checked that the line's were not inversed (polarity)
DSL comes in on the first FXO port and it has been properly filtered, I have disconnected it then reconnected it and did notice anything related to it, somethime it would do the sound when it was and even when it wasn't connected
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