MERLIN LEGEND Communications System Release 6.1
Feature Reference
555-661-110
Issue 1
August 1998
Features
Page 673Tandem Switching
This section describes how line/trunk operations are set up and used for optimal
cost savings and functionality across private networks, including the following
topics:
■ Switch identifiers
■ ARS access to lines/trunks on remote networked systems
■ Remote access settings to allow network routing
■ Feature interactions with line/trunk features such as pools and PRI
“Uniform Dial Plan Features” on page 710
describes how the system is set up and
used for one aspect of private networks: non-local dial plan extensions, including
the following topics:
■ Intersystem calling between extensions located at different systems in a
private network
■ Details of UDP routing for intersystem calls and other routed calls
■ Feature interactions across private networks
Tandem switching offers the following features and benefits:
■ Toll Savings. Private networked trunks allow you to realize cost savings
on long-distance and toll calls in the two following ways:
— Callers on a local system can use ARS to reach the public switched
telephone network via outside trunks connected to networked remote
systems, decreasing the cost of toll calls. No special dialing is required.
See “Automatic Route Selection (ARS), Uniform Dial Plan Routing,
and Remote Access” on page 675 for details.
— In addition, organizations can use private networked trunks to make
calls between networked systems, which may be geographically distant
from one another. For details about this functionality, see “Uniform Dial
Plan Features” on page 710.
■ Service Cost Savings. There are two ways that organizations can save on
costs incurred from service providers:
— Customers order a point-to-point T1 facility from a service provider, then
use system programming to set it up for tandem PRI or tandem T1
services. As necessary, a service provider can provide amplification for
these digital tandem trunks, but does not supply switching services.
— Release 6.0 and later systems support fractional use of PRI and T1
facilities through drop-and-insert equipment placed between networked
systems that tandem trunks connect. This technique is often used to
provide 2B data services on the dropped channels or B-channels, while
reserving the remaining lines for voice traffic. All T1 channels (emulated
tie and Switched 56 data) and PRI B-channels must still be programmed
and all do count towards the system maximum of 80 lines. To learn more
about using and setting up T1 and PRI tandem trunks, refer to “Primary
Rate Interface (PRI) and T1” on page 489.
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