How do I set No-Ring for "Potential Spam" calls?

Thanks. But I don't want it to block all calls not in my contacts list. I just want the ones Verizon tags as potential spam not to ring. I get enough legitimate calls from people not in my contacts list that I don't want to block them all. But so far Verizon has been really good about tagging spam, so I'd just like to stop those from ringing. They can still leave voicemail, so I'll get the message if the call is legit.

Some more searching and I found the answer to my own question: Verizon's Call Filter app seems (based on the description) to do exactly what I want. I was looking for a setting on my account page on Verizon's website, and what I needed to look for was an app. There's a pay version ($3/month) that offers added features, but the free version will shunt calls directly to voicemail or (if you prefer) dump them entirely. You can set it for all spam calls, medium & high risk, or high risk only. All I need is to shunt spam calls to voicemail so I'll probably stick with the free version. Thanks to Lawrence and Tim for the hints that sent me in the right direction!