I've been away from Ma Bell since the 1960s, so I have no idea how ESS offices work. I am experiencing a situation that has me baffled, and wonder if someone here can shed any light.

I have three lines in my home, all to the same C.O., of course, all with the same prefix. There are two numbers in a nearby city (diferent area code) that I cannot call all of a sudden. I dial the number from any of my lines and nothing happens... just silence; no reorder, no timeout. Just like "Siezed, not stepped" or "A&D No Crosspoints." These two numbers are working, the party at that end can call out and receive other calls, and I can call any other number in that area code and prefix. I've reported the problem to 6-1-1 and they report that it's been 'assigned to a tech' and should be resolved within a week. Anyone have any ideas?