Caller ID isn't authenticated. The old way is that PBX systems could set the Caller ID to give number for extension. The new way is that VoIP callers set whatev

Caller ID isn't authenticated. The old way is that PBX systems could set the Caller ID to give number for extension. The new way is that VoIP callers set whatever number they want. The FCC is pushing STIR/SHAKEN protocols to add authentication. It is supposed to have been rolled out in US in 2021. I don't know if it solves the problem of overseas VoIP calls since it sounds like only authenticates between providers in US.