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Partial Attestation (B) - The originator knows the identity of the caller, but cannot confirm their right to use the Caller ID. Gateway Attestation (C) - The identity of the caller is not known, as the call originated outside of the network, or internationally.

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.

What Is Caller ID Reputation and How Does It Work? Caller ID reputation is a score assigned to phone numbers by the major cell carriers (ie, AT&T, Verizon, and T-Mobile), similar to a credit score. This score helps to identify unknown phone numbers and determine their risk profile.

If a call is assigned full attestation, it means: The carrier is responsible for originating the call. The carrier has a pre-existing direct relationship with the customer who is making the call and can authenticate and identify this caller. The carrier can verify an association with the number used to make the call.

Attestation is the act of witnessing the signing of a formal document and then also signing it to verify that it was properly signed by those bound by its contents. Attestation is a legal acknowledgment of the authenticity of a document and a verification that proper processes were followed.

Jeremy O'Donoghue: The basic idea of attestation is that it is trustworthy evidence or proof about something. In the case of a cybersecurity system, for example, it means that a relying party like a bank or an IoT cloud provider can be confident about what it is that they are receiving from a device.

Essentially, the attestation levels are designed to protect the integrity of the telecom networks and provide a way to signal confidence levels to other carriers that the calls can be trusted, and at what level.