AT&T MERLIN LEGEND Release 3.1 System Manager's Manual page 259

Adding an Extension
Open the System Programming menu from the console or a PC with SPM.
If your system uses the Set Up Space numbering plan (see Form 2a),
single-renumber the extension jack following the instructions in "Single
Renumbering" in the "System Renumbering" section of System
Programming , Chapter 3.
NOTE:
This task requires Extension Forced Idle for this extension jack.
If you are adding a personal line, Loudspeaker Paging, or Pool buttons
(Hybrid/PBX only), assign the outside lines/trunks to the buttons on the
telephone, following the instructions in "Assign Trunks or Pools to
Telephones" in the "Telephones" section of System Programming ,
Chapter 3.
Also, you may choose to copy line/trunk button assignments, pool
dial-out code restrictions (Hybrid/PBX only), and Night Service
information (for operator positions only) as described in "Copy Line/Trunk
Assignments" in the Telephones" section of System Programming ,
Chapter 3.
NOTE:
This task requires an idle condition: Extension Forced Idle.
Assign intercom or system access buttons by following the instructions in
"Assign Intercom or System Access Buttons" in the "Telephones" section
of System Programming , Chapter 3.
NOTE:
This task requires an idle condition: Extension Forced Idle. Also, you may
choose to use the Copy Extension procedure described in "Copying
Feature and SA/ICOM Buttons" earlier in this chapter.
If the telephone is an analog multiline telephone and does not have a
built-in speakerphone (BIS) or Hands-Free Answer on Intercom (HFAI),
identify it as such to the system by following the instructions in "Analog
Multiline Telephone Without Built-in Speakerphone (BIS) or Hands-Free
Answer Intercom (HFAI) Capability" in the "Telephones" section of
System Programming , Chapter 3.
If the telephone is an analog multiline telephone and requires a
dedicated pair of extension jacks to provide Voice Announce to Busy or
to provide voice and data features, identify it to the system as such by
following the instructions in "Analog Multiline Telephones with Voice
Announce to Busy" in the "Telephones" section of System Programming ,
Chapter 3, or the instructions in "Data Features" in Chapter 4 of System
Programming .
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Managing the System