AT&T 7406BIS manual Mute button

Mute button	For turning off the microphone of the built-in speakerphone
	or the handset so that the caller cannot hear you. Note: If
	your voice terminal is set for the Speaker (listen only) feature,
	pressing the Mute button will affect only the handset.

Feature button

Transfer button

Hold button

Shiftable feature buttons

Speaker volume- control button

Dial pad

Volume control (under voice terminal)

For accessing a feature, labeled with a feature name and equipped with a green light.

For transferring a call to another voice terminal.

For putting a call on hold.

For accessing each, two features, labeled with feature names; features on the top of the label are accessed when [ Shift ] is activated.

For adjusting the volume of the speaker or the built-in speakerphone.

For dialing the telephone numbers and accessing features (12-button pad).

For adjusting the volume of the tone ringer.