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 oth-
er 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 con-
ference is in progress. Contact System Support for in-
structions 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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