Are you referring to the Sentry Mode Live View function? The one in which you can send your voice through the external speaker?
If so, yes, mine works on my LR refresh Model S. You enable it by going into your Tesla app on your phone, choosing Security, then pressing the button to view the live camera.
Once you do that, then press on "View Live Camera". You'll see three buttons at the bottom of that screen: Honk, Flash (headlights), and a microphone button. Press that one to talk.