A, B, and C on the STIR article

• Wikipedia says STIR/SHAKEN is a suite of protocols and procedures intended to combat caller ID spoofing.
• It says STIR is Secure Telephone Identity Revisited, defined in IETF RFCs, and that it adds a digital certificate to the SIP information used to route VoIP calls.
• The article says there are three attestation levels. A, Full Attestation, means the provider recognizes the entire phone number as registered to the originating subscriber.
• B, Partial Attestation, means the call came from a known customer but the entire number cannot be verified, as with a PBX extension the provider has not registered.
• C, Gateway Attestation, means the call can only be verified as coming from a known gateway, for example a connection from another provider.

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