I just noticed today that the Zoom client checkbox to "hide incoming calls while in a meeting" is greyed out so cannot disable it. I've been rummaging around in the client preferences as well as the zoom portal and so far don't see any place to change this.
I noticed this because some of our users are complaining that the Zoom meeting option to join audio by calling you on your phone seems to have stopped working when using their Zoom phone. I'm wondering if some kind of interaction with the "hide incoming calls while in a meeting" option, but cannot test since cannot disable the option now!