Nortel Modular ICS 7.1, Инструкция по установке

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Dialing plans /
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N0130943 02 Modular ICS 7.1 Installer Guide
Call-by-Call Services Example
This example highlights the use of PRI Call-by-Call Services.
Call-by-Call routing
It shows two offices of a company. One office is in New York,
the other is in Toronto. Each office is equipped with a Norstar
system and a PRI line. Each office has to handle incoming and
outgoing calls to the public network. In addition, employees at
each office often have to call colleagues in the other office. To
reduce long-distance costs, and to allow for a coordinated
dialing plan between the offices, private (tie) lines are used to
handle inter-office traffic.
Network calls are external calls, even though they are dialed
as if they were internal calls. Only the features and
capabilities available to external calls can be used.
When programming a button to dial a Network number
automatically (autodial), network calls must be treated as
external numbers, even though they resemble internal
telephone numbers (DNs).
Toronto Office
New York Office
Network #: 2221
Rec'd #: 2221
Internal #: 2221
DID #: 763-2221
Network #: 6221
Rec'd #: 6221
Internal #: 6221
DID #:562-6221
Central
Office
Central
Office
PRI
PRI
Public Network
Tie Connection
Toronto office New York office
Network #: 2221
Rec’d #: 2221
Internal #: 2221
DID #: 763-2221
Network #: 6221
Rec’d #: 6221
Internal #: 6221
DID #: 763-6221
PRI
Tie connection
PRI
Central
Office Central
Office
Public network