Lucent Technologies MERLIN LEGEND Release 6.0 Network Reference Manual page 179

MERLIN LEGEND Communications System Release 6.0
Network Reference 555-660-150
5 System Management
General Programming in Networks
Automatic Route Selection (ARS)
This topic describes two aspects of ARS as it is used in private networks:
The general steps for setting up ARS in order to facilitate the use of PSTN
facilities by non-local users
ARS Facility Restriction Levels (FRLs) assigned to extensions and how
their operation differs in a private network.
There are no new ARS programming procedures for networked systems.
However, existing procedures are used differently and the planning required for
ARS takes the whole network into consideration rather than just a single system.
Setting Up ARS for Network Use
This topic describes the steps for modifying ARS in order to allow calling out on
PSTN facilities connected to a non-local system in the network. It also provides
tips for system managers whose local PSTN lines/trunks are being accessed by
remote users. This section does not summarize ARS procedures but instead
points out the factors that you must consider. Before reviewing this information,
read Chapter 2,"Call-Handling Scenarios" and Chapter 4, "Security." For
programming procedures and details, see "Automatic Route Selection" in Chapter
4 of System Programming .
Follow these general steps:
1. Pools. Assign tandem trunks to pools.
2. ARS Tables and Digit Manipulation. At the system where calls originate,
use one or more ARS tables for routing network calls. The type of table
required depends upon how users in your system will employ networked
lines. Typically, you might need an Area Code table. For example, if the
remote system is in the 617 area code and your local system is in the 908
area code, the Area Code Table that you set up might include the entry
All tables that specify tandem trunk pools must prefix the ARS access code
of the remote system.
For all fully programmable ARS tables, ARS tables 17 & 18, Dial 0 table,
and Special Numbers table, the Remote Access code must not be
programmed in the prepended digits attributes table of each table.
!
.
CAUTION:
Unless networked systems are collocated, each system should have
at least one loop-start line connected to the PSTN. The line is
required to allow connection of a power-failure telephone to the
Power-Failure Transfer (PFT) jack on a module as a power outage
backup and for correct routing of emergency and other N11 calls. To
5
5
Issue 1
February 1998
Page 5-3