AT&T 7406BIS - Manual (Page 6)

Call appearances/
feature buttons
Select Ring
button
Message light
Conference button
Drop button
Volume control
(under voice
terminal)
Handset Display
Shift button
Display-viewing
adjustment
Speaker button
Mute button
Feature button
Transfer button
Hold button
Shiftable feature
buttons
Speaker volume-
control buttons
Dial Pad
Figure 1. 7406BIS Voice Terminal