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Gateway Attestation (C) - The identity of the caller is not known, as the call originated outside of the network, or internationally. C level is applied when A or B cannot be.

Gateway Attestation (C) ? The service provider has authenticated from where it received the call, but cannot authenticate the call source. An example of this case would be a call received from an international gateway.

Attestation is a crucial part of the STIR/SHAKEN process and includes three categories to determine essential information about the caller by evaluating the ?attestation? level of each call. These attestation levels distinguish a caller's validity to use a specific number.

A status (Full Attestation) ? The service provider has authorized the call as coming from the correct origin, so consumers should feel confident answering their phones. B status (Partial Attestation) ? The service provider can verify where the call comes from but cannot verify that the caller owns the number.

Again, Full Attestation, or an A rating, means that carriers: Are responsible for originating calls. Have pre-existing relationships with the caller and can identify and authenticate the caller. Can verify the association between the caller and the number dialed from.

This attestation provides assurance that the properties of the device (for example, the serial number) are legitimate (as attested to by the device's Secure Enclave and verified by Apple's servers) and not spoofed.

At load-time, the TPM uses a hash function to fingerprint an executable, an executable plus its input data, or a sequence of such files. These hash values are used in attestation to reliably establish code identity to remote or local verifiers.