28 CHAPTER 2: DIAL PLAN
Dial Plan Concepts
and Overview
The dial plan configuration file is an ASCII text file that implements the
dial plan and specifies pretranslation (digit manipulation). The system is
shipped with several default dial plan configuration files, typically, a
3-digit and a 4-digit file for each supported country.
The dial plan configuration file includes several tables:
■ Internal — Must be table ID 1
■ Incoming — Must be table ID 2
■ Least Cost Routing — Must be table ID 3
■ Routes
■ Pretranslators
You can create additional tables if necessary.
Each dial plan table consists of a series of entries, each of which includes
a sequence of digits and the action to be performed by the NBX system in
response to sending or receiving those digits. For more information on
the Internal, Incoming, and Least Cost Routing dial plan tables, see “Dial
Plan Tables” later in this chapter.
Usually, you access the dial plan configuration file and manage dial plan
operations, tables, pretranslators, and extension lists through the NBX
NetSet administration utility. If your dial plan is larger than 32,000
characters, however, you cannot edit the dial plan using the NBX NetSet
utility. You must export the dial plan, edit it, and then import it.
Before you configure the dial plan, please be sure that you understand
these concepts:
■ Call Process Flow
■ Inbound and Outbound Call Processing
■ NBX System Database
■ NBX System Dial Plan
■ Pretranslation
■ Routing
In addition, be sure to understand how the dial plan configuration file
can affect other parts of the NBX system. See “System Features Affected
by the Dial Plan Configuration” later in this chapter.
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