Siemens Hicom 150 H Operating Instructions Manual page 23

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It is important that you reach the called party, but the
number is busy.
Lift the handset.
Enter the internal station number.
Wait (approx. 5 seconds) until the busy tone is followed
by the ring tone.
The called party can then respond Æ page 7.
The called party can prevent automatic call wait-
ing Æ page 8.
If this feature is configured (consult system
support), you will hear the ring tone
immediately.
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This function is only available if it has been configured
by the service technician (contact System Support).
Precondition: You have dialed an internal number and
hear a busy signal. It is important that you reach the
called party.
Enter the code.
The called party and person to whom this party is
talking hear an alerting tone every two seconds.
If the called party has a system telephone with display,
the following appears on the screen: "Override: (station
no. or name)".
You can now start talking.
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