I got the same thing. The beauty is if you have Google voice you can block the number. Most VoIP providers offer a number blocking as well and I think it is free to do. Regular land line providers can block a specific number but i think they still charge to do it.
I'm blocking the number as of now. Great Blog it saved me a lot of time.
The caller ID says Education Manager. They not only call my home and don't leave a message, but they are calling my son's cell phone as well. I'm afraid it might have to do with anything from tests for college to colleges he is applying to. Whoever it is, I don't appreciate whoever it is using private information to make hang up calls and not leave a message.