Siemens OPENOFFICE ME 사용자 설명서

Prerequisite: You are engaged in a call in speakerphone 
mode.

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and 

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Lift the handset. Proceed with your call.

You can let other people in the room join in on the call. 
Let the other party know that you have turned on the 
speaker.

Prerequisite: You are conducting a call via the handset.

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Press the key shown. The LED lights up.

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Press the key shown. The LED goes out.