3Com SuperStack 3 NBX Administrator's Manual page 58

58 C 2: D P
HAPTER IAL LAN
Table 9 Dial Plan Extension Settings (continued)
Field
Call Park
Extensions Range
Start External
Discovery At
External Keyset
Prefix
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.
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.
Purpose (See Notes 1 and 2)
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
■
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
■
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.