Nortel ICS Install Manual page 139

For example, a user in the west end branch might dial 9-555-
1212 (for a local call) or 9-1-613-555-1212 (for a long distance
call). These public calls are routed to the Meridian 1 by the
Norstar routing table. Routing tables at the Meridian 1 will
then select an appropriate public facility for the call.
Private network calls are made by dialing a four-digit private
network DN. For example, if a user in the west end branch
wishes to call a user in the east end branch within the private
network, they dial 6221.
Private networking using routing tables
West end Branch
West-end branch
Network #: 2221
Network #: 2221
Rec'd #: 2221
Internal #: 2221
PRI (SL-1)
PRI SL-1
N0130943 02
Rec'd #: 2221
Internal #: 2221
Meridian M1
Meridian M1
Central
Central
Office
Office
Private networking using PRI SL-1 / 139
Network #: 6221
Network #: 6221
Rec'd #: 6221
Internal #: 6221
Internal #: 6221
Meridian 1 Meridian 1
DN: 4221
DN: 4221
PRI (public protocol)
PRI (public protocol)
East-end Branch
East-end branch
Rec'd #: 6221
PRI SL-1
PRI (SL-1)
Modular ICS 7.1 Installer Guide