Talk Back System enables free broadcasting and telecommunication in a particular area such as deck and machinery areas in the ship. All substations can be called to the main and remote stations with the maximum capacity of 45 substations. It can be connected to the PAGA and the PABX system as well. This system has the function of both ‘call in all’ and ‘call in group’ and of the automatic switch of power for the main and the emergency situations.