This started showing up several months ago. It really angers me because sometimes when you are expecting a call from doctor/pharmacy you can't afford not to answer it for fear of missing an important call.
Then you get the calls purportedly from the IRS threatening you with arrest IF you don't call their number. Elderly folks can get scammed over this easily. The FCC and the telephone companies could shut them down cold if they wanted to.
This past March I was at my desk when the phone rang and it was my own phone number. My phone was calling itself. :-)