Siemens hicom 150 H optiset E standard Operating Instructions Manual page 45

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Speakerphone mode?
simultaneously Save.
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To help the other party understand you clearly while you
are talking into the microphone, you can adjust the tele-
phone to the acoustics in your environment: "Quiet
room", "Normal room" and "Noisy room".
or Press one of these keys while the phone is idle.
Select and confirm.
or To set the room type: Keep pressing these keys until
the setting you want appears on the screen.
Save.
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You are engaged in a call.
or To raise or lower the volume: Keep pressing the keys
until the desired volume is set.
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You can swivel the display unit. Adjust the display unit
so that you can clearly read the screen.
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