Received a call from this number and when I looked it up it appeared to be a cell phone or personal land line. I called it back just out of curiosity. It's a robo-dialer set to look like a residential phone. Not sure what company it is. When you call, the reception sounds terrible and the automated message states "The survey you were called about is now over" or something. Don't worry about answering this number, it's not an important call.
Called office but came in on 3rd line so I was immediately suspicious. No response to my greeting so I hung up. I never say hello again or wait around; you're not there when I answer, you're GONE!