3Com 3C10402B Administrator's Manual page 311

Dial Plan Configuration File Commands 311
Arguments
— One of these: Telephone, Park, Auto Attendant, Hunt
szExtensionType
Group, External.
— The lowest desired extension for this device type.
szLowestExtension
— The highest desired extension for this device type.
szHighestExtension
Example: These commands define the extension range for telephones as
100 through 449, for call park as 601 through 609, for Auto Attendants
as 500 through 599, for hunt groups as 450 through 499, and for
external lines as 600 through 799.
ExtensionRange Telephone 100 449
ExtensionRange Park 601 609
ExtensionRange Autoattendant 500 599
ExtensionRange HuntGroup 450 499
ExtensionRange External 600 799
CAUTION: Do not define extension ranges that overlap. The only
exception is Park, which must be within the External range.
ExternalSettings Syntax
ExternalSettings szExternalKeysetPrefix
szFirstAutoDiscoverExtension szDefaultAutoExtension
Description Specifies settings for several aspects of external devices.
Arguments
— The digits that are prepended to external calls
szExternalKeysetPrefix
made in Keyset mode. This is used to determine the Class of Service (CoS)
for external calls made in Keyset mode. Typical values for this digit are 8,
9, or 0 (zero). This prefix is set to the appropriate number in each
country's dial plan.
Example: In the default internal dial plan table, the digit 9 instructs the
system to connect the call to an external line. When a telephone has a
button mapped to an external device, and the user places a call using
that external device, the system prepends the digit
szExternalKeysetPrefix
to the digits dialed by a user; then the system applies the dial plan tables
to determine call Class of Service.