I tried changing all the problem phones to 2 conductor pinouts on the line cords. This had no affect on the problem though. I haven't yet verified if there is anything on the display when the off hook squawk condition occurs.

I had one phone that used to randomly phantom dial the operator & other extensions before I changed from a DVXII to an XTS phone cabinet. This is one of the problem extensions now. I did change this person's phone out prior to the cabinet changeover which seemed to resolve the phantom dial problem.

However, knowing that this same extension is one of the ones currently having issues, it is possible that just the port and not specifically the phone itself is actually having a problem. It could be phantom dialing again. I did re-use the same DTIB cards from the old DVX system.

That's No moon, its a space station!