Have had numerous calls from this number, beginning in November 2012.  Never answered, and they never left a message.  I did some detective work, and found out the number comes from a Magic Jack phone (YMax communications).  I used Skype to call the number and it went straight to message, saying "You have reached the desk of Sharla Schimmoeller" (I *think* I have the right spelling -- as she appears on LinkedIn as a Sr. Telemarketer -- working from home, B2B).  Not clear on any other details, but that should help.  That number is now blocked as well.  I'm also on the National Do Not Call Registry.