The numbers that call you and you answer and they hang up are actually part of the patroit act and used to monitor suspects the the NSA is keeping tabs on. If you have recieved a call from this number or any numbers that call you then hang up, you need to think what does the NSA want with you.
This is one of three va numbers that calls and hangs up. When I try to call them back it's either a non-working number or a fax machine. It's getting to be annoying.