AT&T Definity ISDN 7507 - Manual (Page 15)

Conventions
The following conventions are used in the procedures:
Gray Type Procedural steps in gray type are steps that you should
follow if you do not have a button assigned for the
feature.

xxxxx

This box represents a call appearance button which is
used exclusively for placing, receiving, or holding calls.
The button has a red light and a green light and is
labeled with an extension number (shown as

xxxxx

).

Feature

and

Feature xxxxx

[handset tone]
Each of these boxes represents a button that has a
feature assigned to it. The button is labeled with the
feature name, sometimes followed by an extension
number or a person’s name (shown as

xxxxx

).
The tone that appears in brackets after a step indicates
what you should hear from your handset after
successfully performing that step.
For a list of tones and their meanings, see the section titled Tones and Their
Meanings.
For a list of glossary terms, see the section titled Key Words to Know.