Private Network Tandem Calling - Nortel ICS Install Manual

• NCRI count allows a call to be forwarded in the network
up to five times before the system releases the call as
undeliverable. However if TAT or TRO occur, the counter
gets reset, as well. This counter is hard-coded.

Private Network Tandem calling

Tandem networking is a chained network established between
two or more MICS systems. All the systems are connected via
PRI SL-1 lines.
In the network example shown below, nodes A, B, and E are
in one location, Nodes C, D, and F are in a second location.
The two systems are tied together between nodes A and C.
Nodes A and C are also connected to the local public network.
Tandem network
Public: 403-765-XXXX
Private ID: 395
private trunk
E
Norstar
private trunk
F
Norstar
Public: 613-766-XXXX
Private ID: 396
This configuration allows both local network users and remote
users on the public network to access the remote PSTNs
through the private lines, thus avoiding public call charges.
N0130943 02
Calgary
Public: 403-762-XXXX
Private ID: 392
private trunk
B
Norstar
private trunk
D
Ottawa
Norstar
Public: 613-764-XXXX
Private ID: 394
Private networking using PRI SL-1 / 129
Public: 403-761-XXXX
Private ID: 391
Lines to public
A
network
Norstar
private trunk
Lines to public
C
network
Norstar
Public: 613-763-XXXX
Private ID: 393
Modular ICS 7.1 Installer Guide
Calgary network
routes only area
codes 403 and
604
Public
Network
Public
Network
Ottawa network
routes all area
codes except
403 and 604