Siemens Hicom 150 H Operating Instructions Manual page 38

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If you have activated call forwarding for a trunk, a
special dial tone sounds when the line is seized.
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Normally, audible signaling of all calls for the executive
is heard only in the secretary's office.
You can activate audible signaling so that calls are only
signaled on the executive telephone and on a second
telephone assigned to it.
Activating this function:
Lift the handset.
Enter the code.
Enter the number of the trunk key you wish to use.
Deactivating this function:
Lift the handset.
Enter the code.
Enter the number of the trunk key you wish to use.