Siemens Hicom 150 H Operating Instructions Manual page 8

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Placing the first call on hold and answering the
second call (not for all ISDN telephones)
Enter the code.
You are connected to the call waiting party immediately.
The first party is placed on hold.
Ending the second call and resuming the first one:
Press the key.
Enter the code or wait two seconds.
or (depending on the configuration)
Press the key twice.
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If this function has been configured (ask your service
technician), you prevent or allow a second call Æ page 7
from being signaled by automatic camp-on during an
ongoing call.
Lift the handset.
Enter the code for "off (prevent)".
or
Enter the code for "on (allow)".
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You can suppress the call waiting tone (approx. every
six seconds) for external calls. A one-time special dial
tone then alerts you to the waiting call.
Lift the handset.
or
Enter code for "tone off" or "tone on".