The STI Governance Authority (STI-GA) has issued new guidance on improper attestation in the STIR/SHAKEN framework. The guidance defines improper attestation as cases where an originating service provider signs a call with an attestation level inconsistent with the information it has about the call. The STI-GA emphasizes the importance of adhering to the correct attestation levels and provides examples of improper attestations. Service providers need to be cautious as improper attestation may result in the revocation of their authorization to authenticate calls using STIR/SHAKEN.