I had to answer because I was expecting a call from this area code. The usual dead air for 4-5 seconds - then sudden onset of background noise (like a boiler room) and someone asked for me by my first name. When he said he was a licensed contractor I hung up.
Received a call @ 12:00 PM I answered saying, "Wrong number. Put this on your do not call list." No response I said it. So I said it again. No response again, so I hung up.