telephone switches are programmed to switch calls to 911 if
random digits are pressed
digits and noise are ‘seen’ by the switch
the ‘hookswitch’ is randomly pressed (or appears to be pressed)
The assumption is that a person partially incapacitated and trying - but failing to dial 911 - needs help.
You can talk with your local carrier to see of this programing is in place. I suspect your ‘static’ may be the issue. The likely culprit is the outside plant having a corrosion problem.
Does this happen after a rainstorm?
We did not have rain yesterday, so I do not think that’s the issue. We do often lose DSL when precipitation takes place. The wires into and throughout this place are over 20 years old. May be time for an overhaul.