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Many would call it the most important part of STIR/SHAKEN. In the STIR/SHAKEN process, attestation occurs when the originating telephone service provider verifies the call's source and call number to attest the incoming number's authenticity.

Procedure for Attestation/Apostille Authentication of Documents. Applicant Regional Authentication Centres (RACs) (Details of RACs is available at following link) Deposition of Documents with authorized Outsource Service Provider. ... Receipt of apostilled/Attested documents from Outsource agencies.

Lastly, ?C? or ?gateway? attestations mean the provider has originated the call on the network, but cannot authenticate the call source.

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.

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.

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.

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. C level is applied when A or B cannot be.

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.

STIR/SHAKEN uses digital certificates, based on common public key cryptography techniques, to ensure the calling number of a telephone call is secure. In simple terms, each telephone service provider obtains their digital certificate from a certificate authority who is trusted by other telephone service providers.

Attestation. In a STIR/SHAKEN call, the originating service provider signs (or attests) to their relationship with the caller and their right to use the calling number.