AT&T MERLIN LEGEND Release 2.0 MLX Direct-Line Consoles Operator's Manual page 73

Features
Dialing a Feature Code
Many features have a 1-, 2-, or 3-digit feature code. If all your
line buttons are programmed, or a feature does not appear on
the Menu or Feature screen, you can use additional features
by dialing their feature codes (listed on the user cards in the
tray under the telephone and in Appendix A of this guide).
To use a feature code:
1. Press Feature.
2. Dial the feature code.
Using a Programmed Button
Some features can be programmed onto a line button for
one-touch use or to turn features on and off. Your console
may already have features such as Night Service
programmed onto a button. You can program any unlabeled
line buttons with additional features. When a feature is
programmed on a button, just press that button to use the
feature.
To program features onto buttons, you can select the feature
from your display or you can dial a programming code on
your dialpad. Use the following instructions to program
features from the display or with programming codes.
Using Features
4-5