Get this call at least once a day.  Called them back from an anonymous computer phone line that I have set up and some foreign accented person answered the call.  When I asked him who it was, he hung up.  Of course.  When they don't answer,you get a "Majic Jack" unable to answer the call.  Person sounded like they were in a call center type of room as I could hear other voices/phones in the background.
In short, I have not seen many messages about this number so assume it is a SCAM