Enrolling a phone number to your Duo multi-authentication profile will enable Duo to call your phone to verify your identity. This method works with cell phones and landlines.

Enroll your phone number for callback

1. Visit the Account management system.
2. Log into the Central Authentication Service (CAS) with your Directory ID and Passphrase. 
3. Click My Security on the left panel.
4. Click Add a device.
   
   
5. Select Landline as the Device Type.
   
6. Enter the Device Name and your Phone Number in the format (123) 456-7890. Confirm the number, then click Submit.