The emergency intercom system was installed in the Israel's metro, through the emergency telephones, the workers and passenger can call control room, the master station can select to make a two way audio call or an one way announcement to any locations.
The broadcasting intercom system was installed in the Cairo metro, through the fire telephones, the workers and passenger can know the dangerous information, the master station can select to make a two way audio call or an one way announcement to any locations.
