The system, built in compliance with Italian Railway regulations, integrates and manages, through a specific GIS-based graphical interface, both the SOS telephone service and the Audio Advice of Emergency arranged along one or more tunnels.

• A fully redundant fiber-optic network;
• A distributed DBMS provided by a cluster of servers;
• A Call Manager in redundant configuration;

• Several Workstation multiscreen;
• SOS cabinet for emergency call with VoIP phones, audio advice amplifiers, alarm collection and carry out of PLC remote commands.