Siemens Hicom 150 H Operating Instructions Manual page 12

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Lift the handset.
Internal calls: Enter the station number.
External calls: Enter the external code and the station
number.
The called party does not answer or is busy:
Replace the handset.
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You can prevent your station number or name from ap-
pearing on the displays of external parties you call. The
feature remains active until you deactivate it.
Lift the handset.
Enter code for "suppress" or "restore".
System Support can turn caller ID suppression
on and off for all telephones.