Uniform Dial Plan - Lucent Technologies MERLIN LEGEND Release 6.0 Network Reference Manual

MERLIN LEGEND Communications System Release 6.0
Network Reference 555-660-150
1 Introduction

Uniform Dial Plan

Uniform Dial Plan
The network benefits that we looked at earlier in this chapter are possible through
the combination of core system features—primarily Automatic Route Selection
(ARS), Remote Access, and PRI support—and an additional feature designed
specifically for private networks, the non-local dial plan which is part of the UDP.
UDP can route calls over the private network or PSTN. The use and management
of all these features is discussed in Chapters 2, 3, 4, and 5. This topic presents an
overview of how the network takes advantage of the Release 6.0 non-local dial
plan feature.
Each switch in the private network has both a local dial plan and a non-local dial
plan that together form the UDP. The local dial plan is set up at the local system
as in earlier releases, using System Renumbering. The non-local dial plan is a list
of up to 50 different extension number ranges for other systems in the private
network. When users call one another, the system searches the local dial plan; if
the extension number is not found, it consults the non-local dial plan and
associated routing information in order to send the call directly or indirectly to
another system in the network. Routing information is programmed into as many
as 20 patterns consisting of routes. Routes specify pools, voice/data call type, and
FRLs similar to those used for ARS.
NOTE:
In earlier releases, prior to 6.0, intersystem calls were made by dialing a
pool access code followed by the extension number. With Release 6.0 and
later systems, the process is simplified by the reference list that is
programmed on the local system so that it can find non-local extensions
and direct calls to them. Actual system numbering is always performed at
the local system.
The diagram shown in
network consisting of a MERLIN LEGEND Communications System in New
Jersey, another in Illinois, and a third in California. It resembles the network
shown in
1000 in New Jersey and dials Extension 3400 to reach a co-worker at the
California location. The New Jersey system searches the local dial plan for
Extension 3400.
Because Extension 3400 is not located on the New Jersey system, that system
checks the non-local dial plan to find the extension number. The non-local dial
plan has two sets of extension ranges, both of which include routing information
that directs the call to the same private network trunk. This tandem PRI trunk
connects the New Jersey system to the Illinois system. In the non-local dial plan,
one extension range specifies the extensions on the system in Illinois, while the
other includes the extensions on the system in California.
Figure 1–7
Figure 1–3 on page 1–8. A caller picks up a telephone at Extension
1
gives an example of the systems in a private
Issue 1
February 1998
Page 1-16