3Com SuperStack 3 NBX, Administrator'S Manual

Page: 59 / 496

Managing Extensions 59
Changing Extension
Length and Ranges
You can view and change extension settings, such as extension length
and extension ranges.
If you are changing from a 3-digit to a 4-digit plan, import the 4-digit dial
plan configuration file
before you configure or autodiscover any devices.
To view and change extension settings:
1 On the Operations tab (Figure 3), click Settings . The Settings dialog box
appears (Figure 9).
Figure 9 Settings Dialog Box
2 Make the desired changes to the extension settings. Table 9 describes
each field.
3 Click OK to enable your changes and exit the dialog box.
Planning Extension Ranges
By planning extension range on your system, you can accommodate your
present and future needs.
Example: If you initially have 60 telephones and expect to add no more
than 100 additional telephones in the future, choose 100–299 as the
telephone extension range (1000–1199 in a 4-digit system). This
arrangement provides 200 extension numbers to handle the planned
160 telephones plus 40 extra extensions to handle unexpected additions.
Once you set the telephone extension range, you can extend it later,
provided that the new range does not overlap any other number range.