Twilio Performs SHAKEN/STIR Verification on Incoming Calls to Your Phone Numbers

Twilio Elastic SIP Trunking now perform SHAKEN/STIR verification on incoming calls to your Twilio local phone numbers. It can be used to display a trust indicator or to make a routing decision, such as bypassing a voice captcha or IVR and directing the call to an end user.

A verified call that has been given the highest attestation under SHAKEN/STIR means that the carrier that originated the call both (1) knows the identity of the caller, and (2) knows the caller has the right to use the phone number as the caller ID.

There is a new header called X-Twilio-VerStat with the verification result. The new header is only present for incoming calls with SHAKEN PASSporT identity headers. Today, the United States is the only country where carriers instrument a call authentication framework like SHAKEN/STIR.