AT&T MERLIN LEGEND MLX-20L Supervisor Manual page 28

About Your Calling Group Supervisor
Telephones
Line Buttons
The 20 or more buttons in the center of your telephone are
line buttons which connect to system lines. You may have a
different label on one or more of these buttons; consult your
system manager for an explanation of their purpose and use.
The number of line buttons depends on the type of telephone
as follows:
20 on the
22 on the
28 on the
34
on the
Two or more of these buttons are labeled either ICOM
(Intercom) or SA (System Access). You have either ICOM or
SA buttons, but not both.
On telephones with ICOM buttons, you use ICOM buttons for
inside calls and buttons labeled with telephone numbers for
outside calls. On telephones with SA buttons, you can make
both inside and outside calls on SA buttons. You must enter
a dial-out code (usually 9 ) before you make an outside call
using an SA button. You can also use line buttons for outside
calls.
You can program any unlabeled line buttons on your
telephone with calling group features or with user features.
See your telephone user's guide for more information on
programming standard features on your telephone.
2-12
Buttons
MLX-20L telephone
BIS-22 and BIS-22D telephones
MLX-28D telephone
BIS-34 and BIS-34D telephones