Great info! They got the line back in service today, so they might've accidentally disconnected my pair over the week... Verizon tends to do that when rearranging services for other customers (in my experience). It's interesting that I was able to continue hearing the hum and crackle without the dialtone, as though there was still battery present.
I still have the hum and the crackle (actually, the crackling is more disturbing than the hum). But I'll take the steps to get it squared away. If nothing else, I'm making a lot of friends who are completely unappreciated by their employer, even though they've maintained a system that's saved countless lives and kept folks connected that otherwise couldn't.
