A bitmap of this subscriber's current state (pending, established, deleting, tunneling, tunnelAcct, terminated, counted, clientHandleSet, sentAcctStart); more than one bit can be set at once, and no bits set means the subscriber is still in a transient initial state. An admin reads this to see exactly where a session is in its lifecycle, e.g. authenticated but not yet accounted, or in the process of being torn down.