I didn't answer; no message left.  Caller ID said Mortgage Services.

Ditto Bob's post.  Now blocked.

I called the number back(after I blocked MY number), and got the same message in the same voice that I've gotten with other numbers, something like: "If you are not interested in our special promotions, please press one." DON'T DO IT! Pressing one will tell them that they've got a live number, and you'll get even more scam calls.