Caller ID displayed "Out of Area", along with an unknown 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 like AJ, the previous poster above said, it rang continuously for almost 2 minutes, then the call automatically disconnected.
I did a reverse number search on whitepages.com and it listed this number as a "Non Fixed Voip phone number
e.g. Skype or Google Voice" and that the "Phone owner's name" is "not available."