Siemens Hicom 300 E - Manual (Page 20)

Step by Step
Answering calls and Making calls
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Incoming call on loudspeaker
(voice calling)
A colleague addresses you d irectly over the speaker.
The speakerphone mode is automatically activated (not
with optiPoint 500 economy/basic).
Answering via sp eakerphone is immediately possible.
or
C
Lift the handset and reply.
You can ad dress the colleague directly
(
Æ page 24).