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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.

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

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.

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.

Attestation levels B-level attestation: The service provider has authenticated the call origination but cannot verify that the caller is authorized to use the calling number. C-level attestation: The service provider has originated the call on the network but cannot authenticate the call source.

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.