Caller ID "AHAA" ... MAY 29@9:18am EDT… I do not answer calls I don't know. They did not leave a message. Search indicates this number belongs to American Hearing Aid Associates which I have no association with. I am on the DO NOT CALL list. They better not call again.
I answered the phone just to stop it from ringing, despite Caller ID's implication that it would be a nuisance call. On the contrary, it was a representative from an audiology group to which my regular physician had once referred me. The group tested me for free and was offering to do so again. Admittedly they're not totally altruistic, as they would hope to sell a hearing aid if the test deems one to be useful. They'll freely admit that, though -- after all, they're a business, not a public service. The caller knew me by name as well as my history with the group. I asked him about the PA area code (I live 100 miles away), but he explained it was a particular phone service that didn't represent origin of call.
So it's likely that any call from this number is legitimate, or at least worth answering.