I also just got a call today. 11/21/2014. I couldn't answer as I was at work and they were calling my cell. Shows up as 317317. I have Boost Mobile. When I tried calling back, I got "The number or code you have dialed is incorrect."
When I answer this number .. There's a beep almost like a fax machine is trying to connect.. I get calls a lot from this number .. I wonder what will happen if I save it to my phone book and then block it ...