The FCC is finally going to require wireless carriers to implement anti-robocalling technology, after asking them nicely for more than a year to do so at their convenience. Of course, the FCC itself is now required to do this after Congress got tired of waiting on them and took action itself.
The technology is called Secure Telephony Identity Revisited / Secure Handling of Asserted information using toKENs, mercifully abbreviated to STIR/SHAKEN, and amounts to a sort of certificate authority for calls that prevents phone numbers from being spoofed. (This is a good technical breakdown if you’re curious.) More