Siemens 300 H - Manual (Page 18)

Step by Step
Taking calls and setting up calls
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You are addressed directly by a colleague over the loud-
speaker. Handsfree conversing and open listening are
activated automatically.
You can answer immediately in the handsfree convers-
ing mode. (Note: optiset E advance has open listening
only.)
or
Q
Lift the handset and reply.
You can speak to the colleague directly
(
Æ page 22).