Commonplace
My home phone is the target of spam calls with spoofing ID's every day, including the case where the caller ID is my own phone number. I speculate the purpose of that particular spoof is to get you to answer the call out of curiosity.
Aggressive use of my VoIP service's Caller ID filtering feature now keeps the actual unwanted ring-throughs down to a typical of a few per week. Before I dumped my old land line in favor of this VoIP service, spam calls per day had reached an intolerable point.
The FCC will never catch up to these scammers / spoofers - they move much too quickly. It took the FCC years to shut down the infamous "Rachael from cardholder services" scam but within months imitators were back on the phone lines, even re-using the "Rachael" part.