3Com NBX 100 Administrator's Manual page 49

You may see a warning that "destination extension list is empty." This
means that a particular type of device is not installed. You may safely
ignore this type of warning.
International Dial Plan Issues
Several international dial plan issues warrant attention. See these topics:
Customizing an International Dial Plan. If there is no customized
dial plan for your country, you may need to modify the default dial plan.
See "Modifying a Dial Plan Configuration File"
default dial plan, you can test the changes by making a simulated call.
See "Testing a Dial Plan"
Autodiscovering Internal Telephones. If you autodiscover your
company's internal telephones, Auto Discovery usually begins at number
100 or 1000. However, for some countries, internal telephones begin at a
higher number to allow you to directly dial numbers of "national
importance." Auto Discovery allocates telephone extensions numbers
within this range.
The default dial plan for the NBX V3000 system allows you to allocate
internal telephones to extension numbers 1000 through 3999.
The default dial plan for the SuperStack 3 NBX system allows you to
allocate internal telephones to extension numbers 1000 through
3999.
The default dial plan for the NBX 100 allows you to allocate internal
telephones to extension numbers 100 through 449.
For more information on Auto Discovery, see "Using Auto Discovery for
Initial System Configuration" in the NBX Installation Guide.
Dialing Outside Lines. To obtain an outside line, dial 9 or 0 as
appropriate for your country.
WARNING: You must first obtain an outside line before you can dial
emergency numbers.
Managing the Dial Plan Configuration File
on page 51.
on page 54. If you edit the
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