Managing Extensions 57
Table 9 provides a more detailed explanation of extension types, including
default extension ranges and values for 3-digit and 4-digit dial plans.
Tab le 9 Dial Plan Extension Settings
Field Purpose (See Notes 1 and 2)
Telephone
Extensions Range
The range of extensions for telephones.
■ SuperStack 3 NBX: 1000–3999
■ NBX 100: 100–449
Length — This pull-down field specifies the number of digits for
telephone extensions.
Auto Attendant
Extensions Range
The range of extensions for Auto Attendants.
Default:
SuperStack 3 NBX: 5500–5599
NBX 100: 500
–599
For both 3-digit and 4-digit dial plans:
■ Extension 500 is reserved as the default Auto Attendant.
■ Extension 501 is reserved as the voice mail Auto Attendant.
Default Auto
Attendant
Extensions
Default extension that the NBX system assigns to the default
Auto Attendant. The Auto Discovery process assigns this
extension.
The system must direct each call coming in on an external line to
an extension. During the Auto Discovery of external lines
(analog lines and Digital Line Card channels), the NBX system
assigns the default extension (500) as the Auto Attendant
extension. After you import the dial plan configuration file and
complete the Auto Discovery process, you can manually
configure the extension for each analog line and each Digital
Line Card channel, if you want.
For both 3-digit and 4-digit dial plans:
■ Extension 500 is reserved as the default Auto Attendant.
■ Extension 501 is reserved as the voice mail Auto Attendant.
Hunt Group
Extensions Range
The range of extensions for hunt groups.
■ SuperStack 3 NBX: 4000–4099
■ NBX 100: 450–499 (maximum of 30 hunt groups)
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
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