Siemens Hicom 150 H Operating Instructions Manual page 30

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A telephone can be used to monitor a room. The func-
tion must be activated on the telephone that you want
to monitor.
Calling this telephone lets you hear what is going on in
the room.
Activating the telephone to be monitored:
Lift the handset and direct it towards the noise source.
Enter the code.
Deactivating the telephone to be monitored:
Replace the handset.
Monitoring the room:
Lift the handset.
Enter the internal number if the telephone in the room
you wish to monitor.