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UNIFORM NUMBERING PLAN (UNP) - VOICE AND DATA
NEAX2000 IVS
2
Business/Hotel/Data Features and Specifications
NDA-24271, Issue 1.0
Page 323
UNIFORM NUMBERING PLAN (UNP) - VOICE AND DATA
General Description
In the numbering plan for a network to be configured through the use of Tie Lines, a Uniform Numbering Plan
(UNP) is employed. When UNP is employed, a station user from any PBX within the network can call a desired
party by using a uniform dialing method based on the UNP.
Station Application
All stations.
Operating Procedure
The following describes two applications of the UNP:
Station Number
As shown in Figure 1, all the stations of each PBX connected using Tie Lines are assigned a Station Number of
3 or 4 digits, and the location of the PBX can be identified by the first two digits of the Station Number.
When this numbering plan is employed, a station user from any PBX within the network can call a desired party
using a uniform dialing method.
Office Code and Station Number
When this numbering plan is employed, each PBX in the network is assigned a 1, 2, or 3-digit Office Code and
each station in the PBX is assigned a 2, 3, or 4-digit Station Number, as shown in Figure 1. Normally, when
calling another station, the calling station dials as follows:
P+/- xxx- xxxx
Access
Code
Office
Code
Station
Number
+: 2nd DT
-: No Tone
x: 0 - 9
p: 0 - 9