Vtl Connections Using Unique Extension Ranges - 3Com 3C10402B Administrator's Manual

330 C 12: V
HAPTER IRTUAL
VTL Connections
Using Unique
Extension Ranges
C
ONNECTIONS
VTL connections cannot be configured to run through firewalls or NAT
■
routers.
When you calculate the number of devices on a system, do not
■
include the number of VTLs.
There are two implementation techniques you can use: unique extension
ranges (see the next section) or site codes (see
If you can restrict the extension ranges on each of the 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 your defined extension ranges.
Figure 20 depicts a configuration that uses unique extension ranges.
Figure 20 Multi-site Network using Virtual Tie Lines
Chicago
System
Extensions
1000 – 1999
In the sample network shown in
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 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 system is
page
WAN
Dallas
System
Extensions
3000 – 3999
Figure 20, each site is set up to use a
331).
Atlanta
System
Extensions
2000 – 2999