"async" with a spoofed random local number figures fairly prominently, too... actually leaves a robo-recording on my answering machine after illegally ringing my phone... credit card scam suggesting rate changes to my card that I should have received in the mail and to get a new zero interest card. Female voice speaking American English but I bet if I were to "press 1" I'd be talking to someone in a Pakistani boiler room call center.
Please please please enable me to block inauthentic CID (spoofed) calls.
I've received about 5 of those V calls in the past 10 days, and none have been blocked. Nomorobo seems to work only half of the time., Two were from RI numbers registered to unknown people, one was registered to a local fire department across the state, and another was a known survey/cruise scam from Orlando, It's just ridiculous that we're promised a fix and the fix might as well be worthless. Between these, spoofed local numbers, and calls split second apart, Nomorobo has become a band-aid patching the Hoover Dam. I have picked up a new iPhone app called YouMail, and it has squelched so many more of these calls, including the God-awful ringless voicemail spam callers; I wish Cox would make this available or add some level of authentication. There is a special corner in h-e-double hockey sticks reserved for these sub-bottomfeeders.
Who promised a fix? Any call-blocking service or device is only effective against known numbers. You can't stop unknown numbers from ringing your phone. Well, I can, but that's only my allow-list strategy.
You on the right track to build your own strategy.