To turn off the speaker and return to handset

1Pick up handset

Red light next to [ Speaker ] and red light next to [ Mute ] go off

Speaker goes off

To mute the microphone associated with the handset so the other party cannot hear you

1Press [ Mute ]

Red light goes on and other party cannot hear you

2Press [ Mute ] again to resume talking to other party through handset

Red light goes off and other party can hear you again

To activate the speaker while using the handset

1Press [ Speaker ]

Red light next to [ Speaker ] and the red light next to [ Mute ] go on steadily

The speaker is active, and the handset is turned off

To end a call

(while handset is on-hook and only speaker is active)

1Press [ Speaker ]

Red light next to [ Speaker ] and red light next to [ Mute ] go off

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AT&T 8410 manual