AT&T 7406BIS - Manual (Page 23)

To see number stored
on an Abbreviated
Dialing (AD) button 1 Press selected [ AD xxxxx ] while on-hook
●
Stored number is shown
2 Press [ Normal ] to return to normal display or repeat step
1 to see another number
To place a call using an 1 Press selected [ AD xxxxx ] (while off-hook)
Abbreviated Dialing
(AD) button
●
Call is automatically dialed