Another device that can be set up for Duo is a landline phone. This should not be used as your main Duo authentication device.
Step 1: Proceed to login.carleton.edu
Step 2: Make sure you are enrolled to Two Factor Authentication
Step 3: Return to login.carleton.edu, and select "Manage Your Phones and Devices"
If this is your first time setting up a device, you should see the following:
If it is not your first device, log in using any of the available options and then click on "Add a device"