Managing Extensions 55
Some countries reserve numbers beginning with 11 for numbers of national importance. To accommodate this requirement, you can begin the telephone extension range at 120.External
Extensions Range The range of extensions that are connected to external devices,
such as Analog Line Card ports, Digital Line Card ports (BRI-S/T,
T1, E1, ISDN PRI), Call Park, and Paging extensions.
Default:
■SuperStack 3 NBX: 6000–7999
■NBX 100: 600–799
Call Park
Extensions Range The range of extensions for Call Park. This feature allows the
user to temporarily park a telephone call and then pick it up at a
different telephone. Call Park extensions must be a subset of
external extensions.
■SuperStack 3 NBX: 6000–6099
■NBX 100: 601–609
Start External
Discovery At The extension to use when autodiscovering external devices.
The system assigns extensions starting with this number and
incrementing upward as they are discovered. If the highest
extension is reached, the system starts looking from the
beginning of the external range and selects the first unused one.
Typically, systems do not use all of the available external
extensions from 600–799 in a 3-digit dial plan or from
6000–7999 in a 4-digit dial plan.
Default:
■SuperStack 3 NBX: 7250
■NBX 100: 750
External Keyset
Prefix In Keyset mode, when a button on an NBX Business Telephone
directly accesses an outside line, the NBX system must check
Class of Service. The system prepends the External Keyset Prefix
value (typically 8, 9, or 0) when it makes a call in Keyset mode.
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.
Tab le 9 Dial Plan Extension Settings (continued)
Field Purpose (See Notes 1 and 2)