https://arstechnica.com/tech-policy/2018/10/robocallers-evolved-to-sidestep-new-call-blocking-rules-ags-tell-fcc/

The Federal Communications Commission should let phone companies get more aggressive in blocking robocalls, 35 state attorneys general told the commission yesterday.

The FCC last year authorized voice service providers to block more types of calls in which the Caller ID has been spoofed or in which the number on the Caller ID is invalid. But the FCC did not go far enough, and robocallers have "evolved" to evade the new rules, the 35 attorneys general wrote in an FCC filing: