Phone Scam Alert

I got a call Thursday around 6PM from a 412 number with "Pittsburgh" as the only I.D. A woman's voice, probably a recording, said "Hello, this is Grace. I'm calling on a recorded line. Can you hear me OK?" When I asked "What is this about?" I got an immediate hang-up. I believe this was an attempt to record me saying "Yes" as part of some sort of scam. Never say "yes" over the phone to anyone you're not sure is on the up-and-up!