US Federal Communications Agency (FCC) new requirements for telecom operators, obliging to apply a technical standard for caller ID authentication () in order to combat the falsification of telephone numbers during automated calls. Telephone operators and voice service providers from the United States that initiate and terminate calls are instructed to implement verification that the Caller ID matches the real number of the caller by June 30, 2021.
Fraudsters and spammers are increasingly using the Caller ID spoofing technique to pass fake caller number information to bypass blacklists and nudge the user into answering the call.
The STIR/SHAKEN specification is based on the verification of the Caller ID with a digital signature associated with the certificate of the operator through whose network the call was initiated. The callee operator can verify the correctness of the digital signature using the public keys distributed through the public repository.
Source: opennet.ru