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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.

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.

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.

Simply put, an attestation letter (often called an Executive Summary Report) is a statement or declaration from an independent third party that lends credibility to the part of the organization undergoing review.

"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 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.

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.