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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.

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.

: an official verification of something as true or authentic. the notary's attestation of the will. 2. : the proof or evidence by which something (such as the usage of a word) is attested.

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.

Attestation is a kind of testimony or confirmation. It is customary to sign a deed, make a will or sign other written documents in the presence of a witness who also signs the document to attest to its contents and the authenticity of the party's signature.

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.

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.