AT&T ISDN 7506 Benutzerhandbuch

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Mute
To mute your handset
1
Press 
 
Mute
 
speaker or the
Speakerphone
Green light comes on
Current call is muted (far end cannot hear you)
To remove mute
1
Press 
 
Mute
  
again
Mute light goes off
Conversation can resume
Note:    
Switching from the handset to the
Speakerphone while the Mute feature is on will
automatically turn the Mute feature off. The same is
true for switching from the Speakerphone to the
handset.
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