Select System Numbering Plan - AT&T MERLIN LEGEND Release 3.0 Programming Summary Manual

Select System Numbering Plan

Select System Numbering Plan
WARNING:
To avoid possible loss of system programming information, renumber
the system before you program the rest of the options described in this
chapter.
The three available system numbering plans listed below appear on System
Planning Form 2a.
2-Digit. This plan is for systems with fewer than 50 extensions and no
plans to exceed that number in the foreseeable future. Each of the first
58 extension jacks is assigned a 2-digit extension number, beginning
with 10 and ending with 67. Any remaining extensions are assigned
4-digit numbers, starting with 6800 and ending with 6885.
3-Digit. This plan is for systems with 50 or more extensions or plans to
grow to that number in the foreseeable future. All extensions are
assigned a 3-digit number, starting with 100 and ending with 243.
Set Up Space. This plan is for systems with a need to customize
extension numbers or use extension numbers of varying lengths (one
to four 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 modes 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.
System Renumbering 3-3