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34 CHAPTER 2: DIAL PLAN
Dial Plan Tables Dial plan tables contain information that controls how the system routes
calls. Each dial plan configuration file consists of at least three dial plan
tables. This section discusses these topics:
■ Dial Plan Command Format
■ Internal Dial Plan Table — Must be table ID 1
■ Incoming Dial Plan Table — Must be table ID 2
■ Least Cost Routing Dial Plan Table — Must be table ID 3
■ Adding New Dial Plan Tables
CAUTION: Tables 1, 2, and 3 must exist. Do not delete them. You may
create additional dial plan tables if necessary, but they must be numbered
4 or higher.
If the Least Cost Routing table exists, it takes precedence over the Internal
table. If the system cannot find a Least Cost Routing table, it attempts to
find a corresponding entry in the Internal table. If you have entries for the
same purpose in both the Least Cost and Internal tables, the behavior of
the dial plan can be confusing.
See “
Dial Plan Command Format” next for a description of dial plan
command syntax and structure. For a complete list and description of dial
plan commands, including command arguments and examples, see “
Dial
Plan Configuration File Commands” on page 100.
Dial Plan Command
Format
Each dial plan table contains a sequence of commands. These commands
collectively determine how calls are handled.
Most of the dial plan commands have a very similar format, as shown in
Figure 2
.