The desired state of the gateway.
The testing(3) state indicates that no signaling
packets can be passed.
When a managed system initializes, all gateways start
with cmedGatewayAdminStatus in the down(2) state.
As a result of either explicit management action or
per configuration information retained by the
managed system, cmedGatewayAdminStatus is then changed
to either the up(1) or testing(3) states (or remains in
the down(2) state).