AT&T MERLIN LEGEND Release 4.0 Feature Reference page 40

Feature Reference
Authorization codes can also be used for call control and call accounting
through the SMDR printout. SMDR may be programmed so that the "home
extension" or the authorization code is stored in the ACCOUNT field when no
account code is entered. The factory setting is for the home extension to be
stored in the ACCOUNT field.
An authorization code can range from 2 to 11 characters and must be unique
across the system. However, more than one user can use an authorization code
simultaneously. Authorization codes do not all have to be one length
systemwide.
Through system programming, the system manager can assign one
authorization code for each telephone extension. One Authorization Code
button can be programmed on any MLX or analog multiline telephone (except
QCCs). A button with a green LED is suggested.
If a user does not have a physical telephone, a phantom extension may be
programmed as a "home extension" to allow the user to use restricted
telephones and for call control and call accounting purposes.
The Authorization Code feature can be activated by modems and fax machines
as well by dialing
Activation of Authorization Code
You can pick up any telephone (except a QCC) in the system and use an
authorization code. You obtain home extension calling privileges by entering
your home extension's authorization code. Do this in one of the following ways:
Press a programmed Authorization Code button and then enter the
assigned authorization code.
Press the Feature button on an MLX display telephone and then select
Press the Feature button on an MLX telephone or analog multiline
telephone and dial
Press
If you activate the feature while on-hook, the features select an SA/ICOM button
and turns on the speakerphone, if present.
After you activate the feature, the green LED (if present) next to a programmed
Authorization Code button starts to flash slowly to indicate that you may enter
the code's digits. An MLX display telephone shows
multiline display telephone shows
40
Authorization Code
and then entering the authorization code followed by a .
.
.
while off-hook on an SA/ICOM button.
and an analog
.