Caller ID "American" Caller was a recorded voice soliciting donations on behalf of American veterans. Told him I don't donate to any charity over the phone or one that I don't investigate in advance. He hung up.

I have no idea who called.  Said hello several times but got no reply.  They have called several times.  Looked up 872 prefix and I don't know anyone in Chicago nor do I do business with any companies in Chicago.  I have since blocked them.