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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Introduction
Page 1-19Uniform Dial Plan
1
Uniform Dial Plan 1
The private 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 two additional features
designed specifically for private networks:
■ the non-local dial plan, which is part of the Uniform Dial Plan (UDP). UDP
can route calls over the private network, SDN, or PSTN.
■ the Group Calling enhancement, which allows assignment of a non-local
UDP extension as a calling group member. (This feature is available for 6.1
or later systems.)
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 private network takes advantage of the
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 private 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 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 UDP ranges and routing patterns
programmed on the local system so that the system can find non-local
extensions and direct calls to them. Actual system numbering is always
performed at the local system.
The diagram shown in Figure 1–8
gives an example of the systems in a private
network consisting of a MERLIN LEGEND Communications System in New
Jersey, another in Illinois, and a third in California. It resembles the private
network shown in Figure 1–3 on page 1–9
. A caller picks up a telephone at
Extension 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