AT&T MERLIN LEGEND System Reference Manual page 216

Features
Multiline Telephones
Single-Line Telephones
Considerations
0n all other multiline telephones, Account Code Entry is activated by pressing a
programmed Account Code button or by pressing the Feature button and
dialing 82. After the account code is dialed, the entry is completed by pressing
a programmed Account Code Entry button or dialing #. On MLX display
telephones, the feature can also be activated and completed by pressing the
Feature button and selecting the feature from the display. Once the entry is
completed, the user can select a System Access, Personal Line, or Pool button,
lift the handset, and make the call.
Note: If the multiline telephone user completes the entry by dialing a #, account
codes cannot be entered with System Speed Dial or Personal Speed Dial, since
the # is used to complete the entry and cannot also be used to activate Speed
Dial.
To make another outgoing call while on a call, the system operator puts the first
call on hold, activates Account Code Entry, dials the account code, completes
the entry, and selects the System Access, Personal Line or Pool button on which
to make the call.
When Account Code Entry is assigned to a button, the feature is automatically
activated and the green LED next to the button flashes when the handset is
lifted and a Personal Line, or Pool button is selected for an outgoing call. On
MLX display telephones, the feature name is shown on the display to indicate
that the feature is activated. The user can then enter the account code, press
the Account Code Entry button (the green LED is steady), select the outside
line, and proceed with the call.
To enter an account code, the single-line telephone user must be listening to
internal dial tone. The feature is activated before a call by dialing #82, and the
entry is completed by dialing #. To change an account code previously entered,
the single-line user must put the caller on hold and obtain an internal dial tone
before activating and competing the feature.
Single-Line telephones must have touch-tone dialing to activate the feature and
must be programmed through Idle Line Preference to select a System Access or
intercom button when the user lifts the handset.
Single-line telephone users cannot enter account codes with System Speed Dial
or Personal Speed Dial since the # is used to complete the entry and cannot
also be used to activate Speed Dial.
Forced Account Code Entry applies only to outside calls that a user
originates. A user can answer incoming calls, add outside calls to a
conference call, and join call on shared lines without entering an account
code.
The programmed Account Code button works only to activate and complete
the account code entry. To enter account code by using a button, a separate
Auto Dial button must be programmed.
Forced Account Code Entry 2-167