Select System Numbering Plan - AT&T MERLIN LEGEND Release 2.0 Programming Summary Manual

System Renumbering

Select System Numbering Plan

CAUTION:
To a void possible loss of system programming information, renumber
the system before you program the rest of the options described in
this book.
Three system numbering plans are available. The choice should appear on
System Planning Form 2a. The three plans are as follows:
The 2-digit plan (for systems with fewer than 50 extensions and no
plans to exceed that number within two or three years): Each of the
first 58 station jacks is assigned a 2-digit extension number, beginning
with 10 and ending with 67. Any remaining extensions are assigned
4-digit numbers, beginning with 6800 and ending with 6885.
The 3-digit plan (for systems with 50 or more extensions or plans to
grow to that number within the next year or so): All extensions are
assigned a 3-digit number, beginning with 100 and ending with 243.
The Set Up Space plan (for systems with a need to customize their
extension numbers or use extension numbers of varying lengths—1 to
4 digits): All extensions are assigned 4-digit numbers in the 7000
range. Extension numbers 1000 through 6999 are also available for
use when you renumber.
In all three numbering plans, the system assigns 3-digit extension numbers to
pools (Hybrid/PBX only), calling groups, paging groups, remote access
codes, the Listed Directory Number, park codes, and Idle Line Access (Key
and Behind Switch modes). In addition, the system assigns 9 for Automatic
Route Selection (Hybrid/PBX only) and Idle Line Access (Key and Behind
Switch only).
Zero (0) represents a special extension number—actually a fixed dial code—
for the primary operator or QCC queue. Any extension number except 0 can
be renumbered.
Extension numbers can be composed of any combination of digits; however,
no number can begin with 0. Trunk numbers (801 – 880) are not considered
to be extensions and cannot be renumbered.
Select System Numbering Plan
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