AT&T MERLIN LEGEND Release 4.0 Feature Reference page 545

Feature Reference
At a Glance - Continued
Factory Settings
(continued)
Pool
Main Pool
Dial-In Tie Trunk
Automatic-In Tie Trunk
Remote Access Code
Extensions
Trunks
Description
System renumbering is the process of reassigning extension numbers to
extensions, adjuncts, trunks, telephones, ranges of extensions on a DSS,
Automatic Route Selection (ARS), calling groups, Idle Line Access, Listed
Directory Number, paging groups, park zones, Pools, and Remote Access.
When the system is turned on, it identifies the type of module installed in each
slot in the control unit and automatically assigns extension numbers. When
assigning extension numbers, the system begins with the lowest-numbered slot
containing extension jacks and assigns numbers starting with the bottom
(lowest) jack and moving consecutively up to the top jack. The system then
moves in ascending order to the next slot that contains extension jacks and
repeats the assigning process.
The factory default assigns 2-digit extension numbers, starting with extension
10. If a user needs a specific extension number, it is simpler to connect the
user's telephone to the extension jack that is already assigned the requested
extension number than it is to renumber the jack where the telephone is
connected.
Both the number of digits and the extension numbers assigned by the system
can be changed to individually address a company's needs. For example,
extension numbers can match room numbers.
Whenever extension numbers are renumbered, the following must be
considered:
Extension numbers can contain digits 0 through 9 in any combination,
except that no extension can begin with 0. Zero is a fixed extension
representing the primary system operator. The system can also be
programmed to associate 0 with a QCC operator position.
Extension numbers can contain one to four digits and must be unique. If
you renumber an extension number with one or two digits, you cannot
70 (all numbering plans)
891 (all numbering plans)
892 (all numbering plans)
889 (all numbering plans)
10–66 (2-digit plan)
100–299 (3-digit plan)
801–880 (all numbering plans)
System Renumbering
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