Instruction manual

Electronic Switched Network Page 1391 of 3156
Features and Services
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Flexible ESN “0” Routing is part of the existing BARS (57) and Network
Alternate Route Selection (NARS) (58) packages and has no interaction with
other features besides these. Since NARS has two translation tables, two
Flexible ESN “0” Routing data blocks will be included in NARS. This means
that a call could be configured to route in two different ways.
This feature is applicable to all route types and network types supported by
ESN. For information on the appropriate prompts and responses in Service
Change (LD 90), refer to the Software Input/Output Guide - X11
Administration (553-3001-311).
Network Alternate Route Selection
Network Alternate Route Selection (NARS) is an integral part of Nortel
Networks’s ESN. Network Alternate Route Selection (NARS) is designed for
large business customers with numerous distributed operating locations,
enabling the customer to tie together the switches at the various operating
locations to create a private telecommunications network. NARS is described
in detail in the Basic and Network Alternate Route Selection: Description
(553-2751-100).
BARS/NARS Incoming Trunk Group Exclusion
Incoming Trunk Group Exclusion (ITGE) is an enhancement to the BARS/
NARS feature. Standard call blocking is applied on outgoing calls to a
specific Numbering Plan Area (NPA), NXX, Special Number (SPN), or
Location Code (LOC) at the ESN node if the call is from a specific incoming
trunk group.
This prevents loopback routing through the caller’s home switch (home NPA,
NXX). Calls that should have been made off-net from the caller’s home
switch are blocked outgoing at the Node. Main users are prevented from using
the ESN to make calls to certain NPA, NXX, SPN, or Location Codes (LOC)
that they are restricted from making at the home switch.