Siemens Hicom 150 H Operating Instructions Manual page 17

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In a conference call, you can talk to as many as four (two
in the case of Office Point) other parties at the same
time. These may be internal or external users.
Lift the handset.
Call the first party.
( ) Press the key.
Call the second station. Announce the conference.
( ) Enter the code.
A tone sounds every 30 seconds to indicate that a
conference is in progress. Contact System Support for
instructions on how to turn it off.
If the second party does not answer:
( ) Press the key.
Enter the code or wait two seconds.
or (depending on the configuration)
( ) Press the key twice.
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( ) Press the key.
Call the new party. Announce the conference.
( ) Enter the code.
etc.
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Replace the handset.
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( ) Enter the code.
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