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

Definition. TN-Validation-Passed-A. Twilio received the SIP INVITE, with a SHAKEN PASSporT, and was able to fetch the public certificate of the originating service provider from the Certificate Authority that signed the call to verify that no one tampered with the SIP INVITE during transit. Attestation level A.

No-TN-Validation: Indicates that all the validation checks passed and the digital signature was confirmed to be valid; however, the call was assigned either a B or Partial attestation or C or Gateway attestation.

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.

STIR/SHAKEN is a framework of technical protocols and implementation procedures that is used by the originating service provider to authenticate an originating caller's identity (Caller ID). STIR/SHAKEN also enables the terminating service provider to verify the Caller ID to reduce the chance of fraudulent robocalls.

October 28, 2022. A verified phone call lets you know when a call you're receiving is actually from the number that appears on caller ID, and is not a spoofed call.

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.

STIR/SHAKEN digitally validates the handoff of phone calls passing through the complex web of networks, allowing the phone company of the consumer receiving the call to verify that a call is in fact from the number displayed on Caller ID.

The feature, known as Verified Calls, will display the caller's name, their logo, a reason why they're calling and a verification symbol that will indicate the call has been verified by Google. The feature arrives at a time when spam calls are on the rise.

As part of Bandwidth's STIR/SHAKEN roadmap, we provide an Inbound Verification (VERSTAT) feature. With this feature, Bandwidth customers can receive STIR/SHAKEN verification results for inbound calls via SIP headers. This is an optional feature that can be enabled in the Bandwidth Dashboard at no additional charge.