Siemens hicom 150 H optiset E standard Operating Instructions Manual page 24

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Speaker
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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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Internal calls: Enter the station number.
External calls: Enter the external code and the station
number.
The other party answers with speaker:
Lift the handset.
or On-hook: Use speakerphone mode and open listening.
The called party does not answer or is busy:
Press the key. The LED goes out.
Your system may also be programmed so that
you have to press the Internal key before you dial
an internal number.
To call an external party, you have to enter an ex-
ternal code before dialing the party's telephone
number (Prime Line is not active; contact System
Support).