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78 CHAPTER 2: DIAL PLAN
There are two implementation techniques you can use: unique extension
ranges or site codes, as described next.
VTL Connections
Using Unique
Extension Ranges
If you can restrict the extension ranges on each of the NBX systems so
that they do not overlap, you can configure the dial plans to route calls
based only on the extension that is being dialed. The caller does not have
to dial any digits to specify the site.
Assess your growth plans for each site to verify that, as you add
telephones, you do not exceed the extension ranges that you have
defined.
Figure 8
depicts a configuration that uses unique extension ranges
Figure 8 Multi-site Network using Virtual Tie Lines
In the sample network shown in Figure 8, each site is set up to use a
unique range of telephone extensions. The dial plan on each of the
systems is configured so that whenever a call is made to an extension not
located at the local site, the NBX system sets up a VTL connection to the
appropriate site.
To make a call to a user in Dallas, a user in Chicago dials a Dallas
extension (3000 through 3999). The dial plan on the Chicago NBX system
is configured to set up the necessary VTL connection to the Dallas NBX
system, and then to the extension at that site.
WAN
Chicago
NBX System
Extensions
1000 – 1999
Atlanta
NBX System
Extensions
2000 – 2999
Dallas
NBX System
Extensions
3000 – 3999