Thanks guys!

I'm going to play with some filters and beads. See if that works
first. I agree that it actually is Verizon's problem (and I will
inform them when I can't get it resolved.) but I want to see if I can
avoid the headace of trying to explain them the issue. $5 worth of
filter/beads might not be so badly spend if it works. Oh by the way...
found out that the powersupply is 48V! (my bad!)