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There are three SHAKEN attestation levels, A, B, and C This simply means that the call has been routed through a gateway that is STIR-SHAKEN compliant. Calls with this level of attestation are most likely to be blocked or tagged as spam.

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.

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.

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.

As a Call Center Software, CallHub can enable STIR/SHAKEN for you. All you need to do is fill a form to register for STIR/SHAKEN. You will find this form within the CallHub dashboard. The details will be sent to the carrier and after the successful verification, STIR/SHAKEN will be enabled for you.

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

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.

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. After completing this check, the incoming call is given one of three types of attestation: Full Attestation.

Under United States federal law, the applicable portion of the attestation must be completed for each passenger age two or older and the attestation must be provided to the airline or aircraft operator prior to boarding a flight to the United States from a foreign country.