It is very important to activate this option on the monitor as shown in the pictures.
From the settings section you can find the following steps to follow.
Add the device to the "Safire Control Center" program and enter the monitor settings.
In this example the AIN1 Alarm input has been used
Pressing the button that connects AIN1 & GND on the monitor will start a "Ding-Dong" sound.
In the "Zone Type" section you can use up to 8 inputs of the monitor, but AIN2 & GND, AIN8 & GND must always be connected.
Keep in mind that these are inputs and not outputs. If you want to install an external speaker, then you must use the relay outputs, in this case you only have two outputs
For more information about this step consult the FAQ:
Enable alarm output on SF-VIDISP monitor