"Federal Communications Commission Chairman Ajit Pai today proposed a major step forward to further the FCC’s efforts to protect consumers against spoofed robocalls: new rules requiring implementation of caller ID authentication (...) reduce the effectiveness of illegal spoofing, allow law enforcement to identify bad actors more easily, and help phone companies identify calls with illegally spoofed caller ID information before those calls reach their subscribers."

https://mailman.nanog.org/pipermail/nanog/2020-March/106254.html