Robo-voice (female) says my property and assets are being monitored and to call this number. Of course, I didn't call back. This scam has been going on for years. I'm blocking this number, although I know they'll just use another next time.
Yes, it's a scam. The IRS will never call you, they will contact you by mail. They will also not threaten you with arrest nor demand payment over the phone via iTunes or other gift card. Just block and ignore these calls.