Caller I.D. showed "Belmont NC". My number has been unlisted for years, so it's either a bot calling progressive numbers or perhaps a vendor that sold off numbers. Not a huge concern.
Call came ou of the blue during a meeting. I did not answer at the time. I later tried to call back, out of curiosity and to ask them not to call me again. I got a "calls blocked to this number" response. This 800notes site is helpful.