Siemens Hicom 150 H Operating Instructions Manual page 23

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You can prevent unauthorized persons from using your
telephone during your absence.
Precondition: You must have configured a personal
identification number (PIN) for your telephone
Æ page 24.
To lock and unlock the telephone:
Lift the handset.
Enter the code for "on" or "off".
Enter the telephone lock PIN Æ page 24.
While the telephone is locked, a special dial tone
sounds when you lift the handset. You can con-
tinue to dial internal numbers as usual.
An authorized party Æ page 32 can also lock and
unlock your telephone.
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