Siemens hicom 150 H optiset E standard Operating Instructions Manual page 74

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or
Release
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Press the DSS key and announce the call, if desired.
Replace the handset or press the key.
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Press the flashing DSS key or trunk key.
Lift the handset.
or
With on-hook dialing: Use speakerphone mode and
open listening.
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By default, your telephone rings when a call arrives on
your line.
If you want your phone to ring even when calls arrive on
other lines, you can turn your ringer on and off for each
line in your group (Æ page 76).
Your telephone rings (one time only or every four sec-
onds) even when you are engaged in another call (atten-
tion ring volume Æ page 44).