Lucent Technologies MERLIN LEGEND Release 7.0 Feature Reference page 765

MERLIN LEGEND Communications System Release 7.0
Feature Reference 555-670-110
Features
Tandem Switching
For detailed information on modifying ARS in order to allow calling out on PSTN
facilities connected to a non-local system in a network, refer to the Network
Reference . The general rules are listed below:
Assign tandem trunks to a pool or pools including only one type of trunk
(PRI, T1-emulated tie programmed for voice and/or data, or analog tie). For
information about assigning trunks to pools, see
For 10xxx and 101xxxx equal access Interexchange Carrier (IXC), Dial 0,
and N11 calls from a collocated networked system that is not connected to
the PSTN, the tandem trunks must be assigned to the main pool so that
these calls can be routed across the network to another system's public
switched telephone network PSTN trunks. For equal access calls, the
system automatically prepends the local ARS access code, which must
match the ARS code of the non-local system.
!
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 617.
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.
At the system where calls are delivered to the PSTN, digit manipulation
may also be required. In the example above where calls are routed from
the 908 area code to the 617 area code, the system in the 617 area code
absorbs 1617. ARS tables can be used, under some circumstances, to
send calls to yet another networked system. It may be necessary to add or
absorb digits for further routing. For more information refer to the Network
Reference .
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
ensure that the correct services are reached, if the loop-start line is
used for emergency or other N11 calls, it should be assigned to the
main pool. In this case, IXC calls determine the number of loop-starts
required. Refer to the Feature Reference guide for details on the PFT
feature.
Issue 1
April 1999
''Pools'' on page 500.
705