I seriously doubt the calls are really sourced from Mississippi; they're likely OUTSIDE the U.S.--and exempt from Do Not Call Registry enforcement....or FBI, CIA, Homeland Security---or even InterPol for that matter.
I just got the same thing--and I'm pretty sure the scammer is using a robo-dialer program that first checks randomly generated numbers to see if they're "live"---then they'll likely call again to see if they get people ( or "marks" as they're called by scammers and con artists ) to answer.
The key to defeating these scumbag scammers is simply to NEVER EVER answer their calls. If you have an answering machine service and have recorded your personal greeting---do you really think it's wise to let potentially dangerous callers know your name??? Think about it.
These scumbags LOSE MONEY calling dead numbers ( phones where only a generic pre-recorded answering machine voice answers ).