The Intercom feature requires certain technical setup to be completed. For the announcements to be sent, the relevant destination has to be physically connected and assigned within the software.
Room - the Room button sends announcements to the simulation area, therefore a DAK (Digital Audio Kit) has to be connected and assigned to the Room (corresponding to the simulation area) via the Rooms tab of the System module, as a Separate In-room intercom device.
Simulator - a Maestro-ready simulator can be connected and used for sending announcements through the manikin.
Facilitator - a device (e.g. headset) can be connected for direct communication with the facilitator, which can be assigned to the room as Separate Hallway intercom device via the Rooms tab of the System module.
For further info on using the Intercom feature, see How can I add new/ customized intercom announcements?