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Signature-based Handling of Asserted information using toKENs (SHAKEN) is an industry framework for managing and deploying Secure Telephone Identity (STI) technologies with the purpose of providing end-to-end cryptographic authentication and verification of the telephone identity and other information in an IP-based service provider voice network. This specification expands the SHAKEN framework, introducing mechanisms for authentication, verification, and transport of calling name and other enhanced caller identity information (e.g., images, logos) and call reason, and describing how they are handled in various call origination and termination scenarios.