56 CHAPTER 2: DIAL PLAN
Table 8 lists typical extension ranges in a 3-digit and a 4-digit dial plan.
Table 9
describes these ranges in more detail and gives the default ranges
and values for 3-digit and 4-digit dial plans.
Tab le 8 Typical Extension Ranges for 3-digit and 4-digit Dial Plans
Extension Type 3-digit (See Notes 1 and 2) 4-digit (See Notes 1 and 2)
Telephones NBX 100:
100–449
SuperStack 3 NBX:
1000–3999
Auto Attendant 500–599 500, 501, plus 5500–5599
Hunt Group NBX 100: 450–499
(maximum of 30 groups)
SuperStack 3 NBX:
4000–4099
External Extensions
(includes line card
ports and Call Park)
600–799
(external Auto Discovery
starts at 750)
6000–7999
(external Auto Discovery
starts at 7250)
Call Park (must fall
within External
Extension range)
NBX 100:
601–609
SuperStack 3 NBX:
6000–6099
Note 1: The NBX 100 is shipped with a factory default 3-digit dial plan. If you import
any 4-digit plan, you must manually specify any 4-digit extension ranges that are not
set by the imported plan. You must also manually change any device extensions so
that they fall within the appropriate range.
Note 2: The Superstack 3 NBX is shipped with a 4-digit dial plan. If you import any
3-digit plan, you must manually specify any 3-digit extension ranges that are not set
by the imported plan. You must also manually change any device extensions so that
they fall within the appropriate range.
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