NEC P/N 1093099 - Manual (Page 132)

Privacy
124 ◆ Features DSX Feature Handbook
Privacy
Description
An extension with Privacy blocks incoming Barge In attempts and Call Waiting (Camp-On) signals. Privacy
helps extension users that don’t want their conversations interrupted.
Note that if an extension with Privacy enabled is on a call with an extension with Privacy disabled, they are
still subject to Barge In attempts and Call Waiting signals to the non-private extension.
Operation
None
Use Privacy to prevent interruptions at high priority extensions.