This is legitimate.  It is from your local police department alerting you of some dangerous situation such as a robbery in your neighborhood or something like that. It's some new, universal-type alert system.

I was sound asleep at 2:45 this morning (Tues.29 Jan 2013).  My bedside phone rang. (830  303 3077)
It woke me and I answered "hello."  A recorded voice of a woman said, "EMERGENCY!  
Please do not hang up.  Press one on your phone for more information."
I did not press one.  I hung up, and there were no more calls for at least an hour.
I could not go back to sleep for about an hour.  If I had pressed "1" what emergency message
would I have heard?

I don't think there was any emergency.  I hope I don't get another such call.
Henry Riemenschneider, 830 303 3077.  My brother is in intensive care in a SA hospital.
My thought about the late/early phone call was about him.  Obviously it was not.
I have grown children and grandchildren, and I thought about them and other possibilities.