Ron ZL4TDR – STSMHS Server Transport System Message Handling Server (STSMHS) its Architecture. The STSMHS is part of the NZ Automatic Building Fire Alarm System. It is a ”Life Critical System” that validates and then forwards valid fire alarms to the 111 Fire Emergency Centers where they are then sent to the NZ Computer Aid Dispatch System. That causes Fire Appliances to be dispatched to the building where the fire alarm was activated.