AT&T 7406BIS - Manual (Page 20)

Voice Features
Note: When placing and answering calls or using the voice features, you have the
option of doing so by lifting the handset or by pressing the Speaker button. If your
voice terminal is set for the Speakerphone feature, pressing the Speaker button
simultaneously activates the built-in microphone so that you can place and answer calls
without lifting the handset.
Abbreviated Dialing (AD)
Note: If you hear the intercept tone while programming,. start over from the
beginning. Abbreviated Dialing buttons must first be assigned by your System
Manager.
To program or 1 On a separate sheet of paper, jot down the outside
reprogram an outside numbers, extensions, and feature codes you want to
number, extension, or program as items on your personal list (see example)
feature code into a
personal list
2 Press [ Program ] (while off-hook)
or dial Abbreviated Dialing program code (while off-hook)
[confirmation tone]