STIR/SHAKEN is a technology framework designed to reduce fraudulent robocalls and illegal phone number spoofing.
Regulators and legislators continue to enact new rules to ensure service providers implement effective ways to combat illegal robocalls. In response, phone companies are deploying Caller ID authentication with the STIR/SHAKEN standard developed by the Internet Engineering Task Force (IETF) to provide a means to certify the identity of originating calls.
STIR: Secure Telephony Identity Revisited
SHAKEN: Secure Handling of Asserted information using toKENs.