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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.

Before completing a call to the intended party, one of three levels of Attestation is assigned: Full Attestation, Partial Attestation, and Gateway Attestation. Full Attestation (A) means the service provider authenticated the caller and phone number.

Full Attestation (A) - The identity of the caller is known, and they have the right to use the Caller ID for this call. Partial Attestation (B) - The originator knows the identity of the caller, but cannot confirm their right to use the Caller ID.

STIR/SHAKEN digitally validates the handoff of phone calls passing through the complex web of networks, allowing the phone company of the consumer receiving the call to verify that a call is in fact from the number displayed on Caller ID.

Full Attestation (A) - The identity of the caller is known, and they have the right to use the Caller ID for this call. 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 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.

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.