Device and User Mode- How to tell which users/Agents are logged in

I have a cuatomer that we just updated to Fpbx 3 / asterisk 13. They have been using D&U for a couple of years. I asked a year ago how I could tell who was logged in without an answer. Isn’t there some way to query the system to see who is logged in? Is this a Freepbx “feature” or an Asterisk feature ? I have 60 users and 45 devices so I need this functuality.