Siemens 600Series ユーザーズマニュアル

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ROLMphone 300/600 Series User Guide
Muting the Speakerphone
If you have a Mute key, you can press it to turn off the microphone, so 
that you can carry on a conversation in your room that the other party 
on your line cannot hear.
Mute is also helpful when someone puts you on hold, since it lets you 
hear your party reconnect even if there is a high noise level in your 
room.
To mute the 
speakerphone
During your conversation, press the Mute 
key.
The status light next to the Mute key blinks 
to remind you that Mute is active.
To cancel
Press the Mute key or lift the handset.
Open Listening
If you have a speakerphone, you may use your handset and, at the same 
time, let someone nearby listen to the conversation over the speaker. 
This feature is called Open Listening. While Open Listening is active, 
someone nearby can hear your conversation, but whatever they say 
will not be picked up by the speakerphone.
To use Open 
Listening during 
a handset call
During your conversation, press the 
Speaker key.
To use Open 
Listening during 
a speakerphone 
call
During your conversation, lift the handset 
and press the Speaker key.
To cancel
Press the Speaker key again.