Kevin Walsh wrote:
Try playing with the "FXS Port Impedance" in the "Regional" settings.
Mine is set to 600.  I imagine that a mismatch here could cause that
sort of thing.

I've just been through them all... I can change its properties (some have a lot of hum, some have a lot of hiss).

The true extent of the problem is apparent through the on-hold music (I was dialling myself to test!). The noise is louder than that, so it drowns it out.

Tony
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