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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Introduction to the DEFINITY system
19Understanding the dial plan
2
Understanding the dial plan
Your dial plan tells your system how to interpret dialed digits. For example, if you
dial 9 on your system to access an outside line, it is actually the dial plan that tells
the system to find an external trunk when a dialed string begins with a 9.
The dial plan also tells the system how many digits to expect for certain calls. For
example, the dial plan may indicate that all internal extensions are 4-digit numbers
that start with 1 or 2.
Let’s take a look at an example dial plan so you’ll know how to read your system’s
dial plan. The following figure shows an example of a simple dial plan.
If you look at the lower half of the Dial Plan Record screen, you see the First Digit
Table. This table defines the dialing plan for your system.
The rows in the First Digit Table indicate what the system does when the row’s
first digit is dialed. The columns indicate how long the dialed string will be for
each type of call. For example, this dial plan shows that when users dial a 4-digit
number that starts with 2, they are dialing an extension.
The first digit table may have any of the following codes:
■ Attendant (attd) — Defines how users call an attendant. Attd access
numbers can be any number from 0 to 9 and contain 1 or more digits. In our
example figure, the system calls an attendant when users dial 0.
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DIAL PLAN RECORD
Local Node Number: _
ETA Node Number: _
Uniform Dialing Plan: _______ ETA Routing Pattern: _
UDP Extension Search Order: ____________________
FIRST DIGIT TABLE
First Length
Digit -1- -2- -3- -4- -5- -6-
1: __________ __________ __________ extension_ __________ __________
2: __________ __________ __________ extension_ __________ __________
3: __________ __________ __________ __________ __________ __________
4: __________ __________ __________ __________ __________ __________
5: __________ __________ __________ extension_ __________ __________
6: __________ __________ dac_______ __________ __________ __________
7: __________ __________ __________ __________ __________ __________
8: __________ __________ __________ __________ __________ __________
9: fac_______ __________ __________ __________ __________ __________
0: attd______ __________ __________ __________ __________ __________
*: __________ __________ fac_______ __________
#: __________ __________ fac_______ __________