Same here Tom. I get calls from that area a lot, and never answer them, and they never leave a message. They seem to come up with new numbers pretty frequently, as I block them if they don't leave a message, and I still get more calls from Rochester with different numbers.
I work in a doctor's office in Olean, and get calls like these constantly. I answer, they say nothing and the line disconnects. Get at least a dozen of them a day.