3Com NBX 100 Administrator's Manual page 63

To convert a dial plan between 3- and 4-digits, follow these steps:
1 If the conversion is part of a hardware upgrade:
a Install the new hardware.
b Install new licenses on the new system. You cannot move licenses
from the old system to the new system. Licenses keys are tied to a
system (hardware) ID number.
2 If you are upgrading your hardware, migrate your data from the old
system to the new system. For details on data migration, see
Data" on page 339.
3 Make sure the system is set up for the type of dial plan you want. For
example, if you are converting an existing system from a 3-digit to a
4-digit dial plan, import the 4-digit dial plan. (Login to the NBX NetSet
utility as administrator and click Dial Plan > Operations.) The 4-digit dial
plan is the default dial plan for SuperStack 3 NBX and NBX V3000
systems.
4 Login to the NBX NetSet utility on the new system and then click Dial Plan
> Convert Extensions.
Existing extensions of these extensions types are automatically converted
to conform with the dial plan (3-digit or 4-digit) that is currently installed
on the system:
Call Park extensions
Voice mail port extensions
Virtual Tie Lines
Paging extensions
5 Manually specify new values for any of these existing extension:
Telephone Extensions
Auto Attendant Extensions
Hunt Group and ACD Group Extensions
External Extensions (digital channel and analog port extensions)
To modify an existing extension, click Dial Plan > Operations > Modify
Extensions, and edit the list of extensions so that each extension falls into
the range for its extension type:
Extension Type
Internal Extensions
3-digit Dial Plan Defaults
100-449
Managing Extensions
"Migrating
4-digit Dial Plan Defaults
1000-3999
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