STIR/SHAKEN bundle added by default to all the approved Primary Customer Profiles

We are adding the STIR/SHAKEN bundle by default upon approval of a Primary Customer Profile (PCP). This is being done for all the new PCPs. We will also backfill STIR/SHAKEN for all existing PCPs without STIR/SHAKEN bundles.

What is STIR/SHAKEN?

STIR/SHAKEN is a caller authentication framework meant to help restore trust by reducing fraudulent robocalls and illegal phone number spoofing. 

Why is this happening?

In a STIR/SHAKEN call the originating carrier (Twilio in this case) signs calls with different attestation levels based on knowing the caller and the caller's right to use a phone number. The three attestation level are Full Attestation (A), Partial Attestation (B), and Gateway Attestation (C):

• A means the Identity of the caller is known, and they have the right to use the callerId in the outgoing call to the PSTN.

• B means the Identity of the caller is known but Twilio does not know if they have the right to use the callerId.

• C means all others, including international calls

Carriers take this into consideration so the better your attestation, the better chance of your calls being answered.

What should you do?

A STIR/SHAKEN will now be in your account by default. However, you still should complete the STIR/SHAKEN process by assigning phone numbers in your account to the approved Primary Customer Profile. This associates a single identity with the phone number. Please review the STIR/SHAKEN documentation for more information.