30 CHAPTER 2: D IAL P LANDial Plan Conceptsand OverviewThe dial plan configuration file is an ASCII text file that implements thedial plan and specifies pretranslation (digit manipulation). The system isshipped with several default dial plan configuration files, typically, a3-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■ PretranslatorsYou can create additional tables if necessary.Each dial plan table consists of a series of entries, each of which includesa sequence of digits and the action to be performed by the NBX system inresponse to sending or receiving those digits. For more information onthe Internal, Incoming, and Least Cost Routing dial plan tables, see “DialPlan Tables” on page 35.Usually, you access the dial plan configuration file and manage dial planoperations, tables, pretranslators, and extension lists through the NBXNetSet administration utility. If your dial plan is larger than 32,000characters, however, you cannot edit the dial plan using the NBX NetSetutility. You must export the dial plan, edit it, and then import it.Before you configure the dial plan, please be sure that you understandthese concepts:■ Call Process Flow (page 31)■ Inbound and Outbound Call Processing (page 31)■ NBX System Database (page 32)■ NBX System Dial Plan (page 32)■ Pretranslation (page 33)■ Routing (page 33)In addition, be sure to understand how the dial plan configuration filecan affect other parts of the NBX system. See “System Features Affectedby the Dial Plan Configuration” on page 34.
