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"Gateway Attestation", "C", indicates the call can only be verified as coming from a known gateway, for instance, a connection to another service provider.

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.

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.

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 (Partial attestation) indicates that the telecom carrier that originated the call knows the customer that initiated the call but does not have an LOA indicating that the customer is authorized to use the Caller ID that the call is being originated from.

Caller ID authentication technology enables subscribers to trust that callers are who they say they are, reducing the effectiveness of fraudulently spoofed calls.

Key Attestation is a feature which allows developers to analyze the security of the cryptographic material managed by Android Keystore.

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.

THE ATTESTATION STANDARDS APPLY whenever an independent CPA has been engaged to issue, or issues, an examination report, a review report or an agreed-upon procedures report on subject matteror an assertion about the subject matterfor which another party is responsible.

SSAE 16 requirements The first audit (Type 1) occurs when the accuracy of a service provider's description and assertion is tested by auditors. The second (Type 2) is when the first audit is combined with the implementation and effectiveness of the controls for a specific period of time.