Appears to be Share Group Inc - which is purported to be a chaity fund raiser, but they appear to "robo" call and never leave a message. Right now I answered and evidently no one was able to pick up the robocall and there was no answer. More infurating is that if you try to call back - a recorded voice answers that states that "Your call was unable to be made" - whehn I suspect that it was simply a recorded answr on their end trying to suggest that the phone system was at fault.
They have called repeatedly over the past two weeks. It is Share Group Inc., some telemarket for various charities -- whatever that means. Just call back the number and hit the option (number two I think) to be removed from their telephone list.