I used to work on reliability of the emergency number in South Australia which could stand: - failure of reserved circuits from outlying exchanges - failure of

I used to work on reliability of the emergency number in South Australia which could stand: - failure of reserved circuits from outlying exchanges - failure of trunk exchange - failure of operators exchange - evacuation of operators - failure of backup operator exchange - evacuation of backup operators - failure of special circuits to emergency services - evacuation of emergency services operations rooms - failure of backup lines to emergency services - emergency services advertised alternate numbers (spread across multiple exchanges in some cases) etc etc Can't work out why just the emergency service number failed not other things as well. Bit surprised.