AT&T Definity ISDN 7507 - Manual (Page 38)

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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