Caller ID displays as "National Cit CA", following by an unrecognizable number. I let it go to my answering machine to screen the call. They didn't leave a message. I dialed back the number and encountered a busy signal.  The line then disconnected.

This number and Caller ID is most likely spoofed since the line automatically disconnected after dialing and no live person answered the call. In addition, Whitepages.com has flagged this number as "Suspected Spam."