Polycom devices notification when entering

Polycom devices notification when entering and exiting the lobby

When a host uses the Personal Room Webex meeting and invites a Polycom unit (500 Group series, Poly X30, or RealPresence Debut) and admits them into the meeting and expels them from the meeting, we hear a beep notification, but we do not hear a beep notification when they move the Polycom devices in and out of the lobby. We use the lobby multiple times throughout a meeting, and this would help tremendously to alert the hosts to confirm that no one has join the meeting inadvertently. How can this feature be enabled?