Audio Device Select Phone Audio

Is there an option to add in the config to select Phone Audio as your audio device for people that like to use video but maybe don’t have microphones so they call in?
I thought i saw a forum post a while ago with someone doing it but can’t seem to find it again or any reference to settings to enable.
Other software we use has a similar function but you dial a unique code on the phone to sync it to your video session.
Thank you.