Thanks. I wish I knew more about telephone operations. I still believe the U.S. telephone companies COULD do something about this but won't. I also believe they make money from illegal calls. But I'm open to the truth if anyone can explain how these scammers use our phone system to their advantage.
Received IRS SCAM phone calls from other numbers recently, so I tried calling this former IRS SCAM number from June 2015. It's still operating almost a year later. Today, I chatted with some middle-eastern guy for a couple minutes, told him I knew he was running a scam, then hung up. Although I doubt reporting the call will do any good, I'm going to do it anyway.