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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.

Lastly, ?C? or ?gateway? attestations mean the 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.

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.

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.

"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. 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.

The origid , standardized as part of STIR / SHAKEN, represents the originating point of a call in each network and opens up the possibility of streamlining the traceback process. The third is potentially to provide some form of display to the end user that the caller ID has been verified.

Verification is usually done by the party asking for evidence of information provided. This could be an employer or recruiter during the hiring process. Attestation is typically requested by the party that owns a document, such as a potential employee.

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.