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If the call is authenticated the Verstat Parameter would be updated as TN validation passed. If the call is not authenticated, then the terminating service provider would set it TN validation failed. In this case, they can also block the call.

STIR/SHAKEN uses digital certificates, based on common public key cryptography techniques, to ensure the calling number of a telephone call is secure. In simple terms, each telephone service provider obtains their digital certificate from a certificate authority who is trusted by other telephone service providers.

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.

1. The verstatparameter is a tel URI parameter within the P-Asserted-Identity header or the From header. P-Asserted-Identity: tel:+15617500080;verstat=TN-Validation-Passed. There are currently three different options to convey verification results through the verstat parameter: TN-Validation-Passed.

Does STIR/SHAKEN apply to SMS/text messaging? Currently STIR/ SHAKEN applies to phone calls only. However, work is on-going in the communications industry to evaluate the best authentication method for SMS / text messaging.

Mobile and A& have been exchanging calls using SIR/SHAKEN since 2019. o date, Mobile says it's protected over 80 million customers from more than 33 billion suspect calls. A& has blocked or labeled more than 16 billion robocalls since 2016.

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.