Overview

SHAKEN/STIR is a set of protocols designed to authenticate caller ID information and verify that it is coming from a legitimate source. It uses digital certificates to validate your ownership of the phone number, ensuring carriers can trust that your calls are genuine.

When enabled, your calls are more likely to display as a “Trusted Call”, improving the chance that recipients pick up.

Why SHAKEN/STIR Matters

• Boosts call completion and answer rates

• Helps prevent caller ID spoofing and fraud

• May display a “Trusted Call” label on outgoing calls

• Does not remove nuisance labels

Requirements

• An EIN (Employer Identification Number) is mandatory for SHAKEN/STIR registration.

• If you don’t have an EIN, we recommend registering your number with the Free Call Registry instead.

How to Enable SHAKEN/STIR

1. If you already registered for A2P SMS:

   • Your phone numbers are automatically enrolled in SHAKEN/STIR.

   • This applies to all new A2P applications submitted after April 23, 2025, and older sub-accounts are also being updated automatically.
     

2. If you have not registered for A2P SMS:

   • You can manually enable SHAKEN/STIR for your numbers now from trust centre
     

Benefits at a Glance

Note: SHAKEN/STIR won't remove nuisance labels but may boost answer rates due to the "Trusted Call" label.

 Tip: SHAKEN/STIR works best when combined with CNAM registration, which displays your business name   alongside your number.

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