This object indicates the current gateway congestion
notification state.
The value of 'true' means the gateway will notify
MGC when the gateway is congested.
The value of 'false' means the gateway won't notify
MGC when the gateway is congested.
This object is 'true' when cmedxCallCongEnabled is
set to 'true' and at least one of MGCs enabled the
CRR notification (cmedxCrrNotifyEnabled is not 0).