This read-write enumeration is the administrative control an operator uses to take the Clarent Gatekeeper out of service, choosing between locked, unlocked, and shuttingDown states to shut it down gracefully or forcefully. Setting it to shuttingDown initiates an orderly wind-down of the gatekeeper's call handling rather than an abrupt stop. For example, an admin sets gkAdminState to shuttingDown ahead of planned maintenance so in-progress calls can complete before the gatekeeper stops accepting new ones, using gkGracefulShutdownPeriod to control how long that takes.