If the system is already on / always on when a person comes in to use the room, chance are they won't notice. If there is sufficient noise going on in the room, one might not hear the camera moving around and while a person might see that, they'd have to be bored and looking directly at it notice. Do you really notice how many systems (HVAC, Lights, computers, A/V) are on when you walk into a meeting room? Especially if you aren't using them or they don't appear to be doing anything they get ignored. Now the beeping of somebody trying to call in requesting that you answer the Video Call, would surely get noticed. That is why the auto-answer should just go away and die. That would solve 90% of the issue (the other 10% being public addresses).