Zoom Phone calls do not go straight to voicemail when status is set to Do Not Disturb

[pwoltman]

Scenario:

Users have Yealink T54W deskphones, as well as the Zoom Workplace desktop app (with call control enabled) and in some cases have the Zoom mobile app.  Do Not Disturb sync is enabled.

If you push the DND button on the Yealink phone: your Zoom status is set to Do Not Disturb for 24 hours.  Incoming calls do not ring your desk phone, desktop app or mobile app.  Caller hears 30 seconds of ringing before receiving the voicemail prompt.

If you set your status to Do Not Disturb via the Zoom Workplace desktop app: the Yealink phone also shows DND as well as the mobile app.  Incoming calls do not ring anywhere, but caller still hears 30 seconds of ringing before getting the voicemail prompt.

If you set your status to Do Not Disturb via the Zoom mobile app (Android): the Yealink phone and desktop apps also show the DND status.  Incoming calls do not ring anywhere, and caller is immediately sent to voicemail.

If you disable call control toggle from the Zoom Workplace app after setting status to Do Not Disturb: incoming calls go directly to voicemail

This seems like a flaw in the system, where Do Not Disturb set via the Android app results in immediately playing the voicemail greeting, but setting DND via the deskop app with call control enabled, or via the Yealink phone, does not result in the same immediate voicemail behavior.