AT&T MERLIN LEGEND Release 3.1 System Manager's Manual page 262

Removing an Extension
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 an idle condition: Extension Forced Idle for this
extension jack.
If you are removing a personal line, Loudspeaker Paging, or Pool button
assignments (Hybrid/PBX only), follow the instructions in "Assign Trunks
or Pools to Telephones" in the "Telephones" section of System
Programming , Chapter 3.
NOTE:
This task requires an idle condition: Extension Forced Idle for this
extension jack.
To remove intercom or System Access button assignments, follow 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 for this
extension jack.
If the telephone does not have a built-in speakerphone (BIS) or Hands-
Free Answer on Intercom (HFAI), remove it as such from 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 required a dedicated voice or voice pair of extension
jacks to provide the Voice Announce to Busy feature, or to provide voice
and data features, remove them from 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 .
Remove the features, following the instructions for each feature in
"Optional Telephone Features," "Optional Group Features," and "System
Features" in System Programming , Chapter 3, or in Chapter 5,
"Centralized Telephone Programming," of System Programming .
Remove the extension from any of the group-assigned feature forms or
lists on which it appears, and remove its individual telephone form from
the planning forms package.
When you have finished, file the form(s) with the rest of the planning
forms.
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Managing the System