This was more prevalent years ago, but it can still happen today: “swingers” is the term for when the wires running from telephone poles touch another telephone line during periods of strong winds. A more serious problem that can also create static is when a telephone wire crosses with a power line. When this happens worse problems than static arise; fires and serious bodily harm.
Sometimes you can hear static on an analog line because of nearby computer equipment. Try removing the biggest culprits (cell phones) and that can make a difference.
If the problem is at the Demarc with the inside wiring disconnected, the phone company would have to fix that. However, if the problem is from within, try a spare pair or replace the cable.
Contact ACS today for service to your phone system!