I got a couple calls from it as well. If you call it back, call from the phone you were called on, in my case my cell-I hate solicitor calls on my cell, when the call goes thru a recording comes on asking if you would like to be placed on their do not call list and just hit 1. Took a couple times for the call to go thru, disconnect once or twice.
If you don't know who it is, don't answer it. All that does is let them know that they've got a real number and they'll bug you more. This number has been added to my very long list of blocked calls now....problem solved....that is until they spoof another number.
Called on 11/09/2012. Caller ID showed "Security Info." Left a recorded (robocall) message on my answering machine about the free security system. I'm on the DNC so filed a complaint with the FTC. Added the 802 area code to my blocked list. Hope that stops them.