What Are The STIR/SHAKEN Attestation Ratings?

Ratings

The three types of attestation categories used by STIR/SHAKEN include:

Full Attestation (Full or A)

This is when the carrier originates the call, is able to verify an association with the number calling, and it has a pre-existing relationship with the number.

Partial Attestation (Partial or B)

The carrier knows the customer, but does not know the source of the number calling, and therefore, the call and/or text message might be spam.

Gateway Attestation (Gateway or C)

The carrier is unable to authenticate the call source and the call will be flagged and/or blocked as spam.