As a major step in its work to combat illegal robocalling, the STI-GA issued a Request for Proposal (RFP) to select a Secure Telephone Identity Policy Administrator (STI-PA). The STI-PA applies and enforces the rules as defined by the STI-GA to put the SHAKEN protocol into action. This solution helps to authenticate calls and let consumers know the information displayed on their caller ID can be trusted — or when that is not the case.