Administrator's Guide

Features and technical reference
555-233-5061656 Issue 5 October 2002
Dial plan
The dial plan provides information to the switch on what to do with dialed digits.
A table defines the intended use of a code beginning with a specific first digit or
pair of digits. These digits tell the system how many digits to collect before
processing the full digit string. For example, a digit string beginning with 8 may
tell the system to wait for 4 more digits because this is the first digit of a 5-digit
internal extension.
All feature access codes, extensions and trunk access codes must be consistent
with the dial plan.
Detailed description
The dial plan provides information to the switch on what to do with dialed digits.
A table defines the intended use of a code beginning with a specific first digit or
pair of digits. These digits tell the system how many digits to collect before
processing the full digit string.For example, a digit string beginning with 8 may
tell the system to wait for 4 more digits because this is the first digit of a 5-digit
internal extension. For more information about the tables that define the dial plan,
see:
■ Dial Plan Analysis Table
■ Dial Plan Parameters
You can also administer a UDP as part of the dial plan to be shared among a group
of switches. For more information, see Uniform Dial Plan. So that calls route to
the desired switch, a UDP requires the following information:
■ A PBX code, which represents the first 1 to 5 digits of an extension and can
range from 0 to 9xxxxxx with a maximum of 50,000 PBX codes on
DEFINITY R or 20,000 PBX codes on DEFINITY SI/DEFINITY CSI.
■ An RNX, which is associated with the PBX code and is used to select an
AAR pattern for the call. This information is required for each PBX code.
The 3-digit RNX can be an AAR location code or, for ENP calls, an ENP
code.
■ A PBX ID (1 to 63), which represents a specific switch (optional).
■ Whether or not the PBX code is local to this system (optional).