Siemens Hicom 300 E - Manual (Page 16)

Step by Step
Answering calls and Making calls
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Open listening
You can allow other persons in the room to listen in on
the call. Always inform the other p arty that you are
switching to the speaker.
Precondition: You are making a call with the handset.
To activate:
Press the key. The lamp lights up .
To deactivate:
Press the key. The lamp goes out.
Switching to speakerphone
This function is not available with the optiPoint 500
economy/basic.
Precondition: You are making a call with the handset.
and
I
Hold the key down and replace the handset. Then re-
lease the key and continue the call.
Switching to the handset
Precondition: You are on the phone in speakerphone
mod e.
C
Lift the handset. Continue the call.
Speaker
S peaker
Speaker