rang my land line 4 hours ago.  Caller ID said Clinton MD.  Voice mail contained 3 seconds of a low hum.  

Same here....

I also just recived a call from this number. I'm in NJ

I received a call from this number today stating to be the FBI. Once I called back a regular answer machine came on. People are crazy now a days.

I got a call from this number, automated message to get a free security system and free installation just for letting them put a small sign in your yard. Push 1 to talk with someone. Maybe Debt collectors trying to be shrewd. If everyone get a free system they are out of business.