Siemens Hicom 150 H Operating Instructions Manual page 16

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You can call a second party while engaged in a call. The
first party is placed on hold.
Press the key.
Call the second station.
Return to the first party:
Press the key.
Enter the code or wait two seconds.
or (depending on the configuration)
Press the key twice.
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Enter the code.
Combine the calling parties into a three-party
conference
Enter the code.
Connecting the other parties to each other
Replace the handset.