AT&T MERLIN LEGEND System Reference Manual page 161

Features
Single-Line Telephones
Considerations
For information on special characters
and their meanings, see Appendix D.
2-112 Directory
Single-line telephone users cannot use the Extension Directory feature or the
Personal Directory feature but can dial the listings in the System Directory by
dialing the System Speed Dial codes assigned to the listings.
The following parameters apply to the System Directory
The listings are established and changed only through system
programming by using the Labeling feature.
Up to 40 listings are stored with a small processor module, and up to 130
listings are stored with the large processor module.
Each listing consists of a three-digit speed dial number, an 11-character
name field, a 40-digit number field, and a two-digit tag field. The tag field
is used to mark the listing and suppress the display of a confidential
number when the number is dialed via the display or the System Speed
Dial code associated with the number while dialing, users see only the
System Speed Dial code associated with the listing. Dialing the marked
number by using the System Directory listing overrides any calling
restrictions assigned to the telephone if the number dialed includes a toll
number in addition to an access code.
The tag does not however, prevent the telephone number from being
displayed when an MLX-20L telephone user selects Show Number to
display the telephone number associated with an individual listing.
Names are created and associated with listings in the System Directory
through the telephone feature.
Special characters may be needed when programming outside Auto Dial
buttons. Each of these characters counts as one of the 40 digits allowed
in the telephone number.
The following parameters apply to the Extension Directory:
The listings are established and changed only through system
programming by using the Labeling feature.
All of the extensions in the system can be stored.
Each listing connsists of a seven-character name field and a number field
for up to four digits.
While the extension is being dialed, it cannot be suppressed from display
telephones.
The following parameters apply to the Personal Directory:
In systems with a small processor module, only 16 users of MLX-20L
telephones can have Personal Directories; in systems with a large
processor module, the number of MLX-20L telephones with Personal
Directories is limited to 48.
A maximum of 50 listings can be included in a Personal Directory.
Each listing consists of an 11-character name field, a 28-digit number
field, and a two-digit tag, which is used to suppress the telephone
number during dialing.