Siemens Hicom 150 H Operating Instructions Manual page 14

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If this feature is configured (contact System Support),
you can reserve a busy trunk for your own use.
When the trunk is free, you receive a call.
Lift the handset.
Enter the external code. The external trunk is busy; you
hear a busy signal tone. Wait about 5 seconds until the
busy tone ends.
The trunk is reserved.
Replace the handset.
When the reserved trunk becomes free:
Your telephone rings.
Lift the handset. You hear the CO dial tone.
Enter the number of the external station.
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If this function has been configured (contact System
Support), you can selectively assign a specific number
(DID number) to your telephone before making an exter-
nal call. The assigned number then appears on the
called party's display.
Lift the handset.
Enter the code.
Enter the DID number you wish to use.
Dial the external number.