The H323 device registration status with the gatekeeper.
The status changes from unknown to registered when the H323
device successfully registers itself with the gatekeeper.
notApplicable: The registration status is not applicable
for this H323 device
unknown: The registration status of the H323 device
with the gatekeeper is unknown
registered: The H323 device has registered with the
gatekeeper successfully
unregistered: The H323 device is no longer registered
with the gatekeeper
rejected: Registration request from the H323 device
was rejected by the gatekeeper.