AT&T MERLIN LEGEND Installation & Maintenance Manual page 637

General Feature Use
Any available line button on multiline telephones can be
programmed for one-touch use of a feature.
Note: Some features, such as Auto Dial, must be programmed
onto line buttons in order to use them. Other features, such as
Privacy, should be programmed onto line buttons so that the
LED next to the line button lights to show that the feature is in
use.
Feature Codes
Feature codes are 1-, 2-, and 3-digit codes that activate features.
To use a feature code, first press the dedicated feature button on
MLX telephones or a programmed feature button on analog
multiline telephones, or dial # on single-line telephones. This
sends a signal to the system that a feature code is about to be
dialed. Then dial the code; the feature is activated.
Note: Some features, such as Personal Speed Dial, can be used
only by dialing feature codes.
The Display
For MLX telephones with displays, select features from the
Feature screen and the Menu screen. See "Display" in Chapter 2
of the System Reference for more information on using features
with the display.
F-2 General Feature Use