Checking the console (console.app), I am seeing (when in the background)
VoIP push for app <private> dropped on the floor.
What could be the reason for this?
If it is significant, I am seeing the messages in pairs.
I.e. at the same time (bar milliseconds)
VoIP push for app <private> dropped on the floor
VoIP push for app <private> dropped on the floor
in the console.app window even though I am only ever receiving a single VoIP (as correctly working in foreground).