Nortel Networks NN43001-314 User Manual

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132

Alternative Call Routing for Network Bandwidth Management

Calls preceded by the ALTPrefix can be handled by the Vacant Number
Routing (VNR) feature. Use Flexible Numbering Plan (FNP) software for
this type of routing.

Examples of Alternative Call Routing for NBWM in operation

The main office systems shown in the diagrams in this chapter are CS
1000E systems. However, this feature is supported on any CS 1000 system.

A call from a Branch Office telephone to a main office telephone

Figure 49 "Example of an alternately routed call between a Branch Office
telephone in Normal Mode and a main of" (page 132)

shows two CS 1000

systems. The system shown on the left is a main office. The system
shown on the right is a Branch Office. Both systems have access to
the PSTN. The Wide Area Network (WAN) is shown in the center with a
gatekeeper/Network Routing Service (NRS) that can be co-resident with a
Signaling Server. IP Phones are also shown associated with each system.
Telephone A belongs to the main office. Telephone B is a telephone at the
Branch Office registered to the main office. There are two bandwidth zones
indicated by the dashed line (main office zone - MO zone and Branch Office
zone - BO2 zone). Telephone A and the Media Gateway belong to the MO
zone. The Branch Office and Telephone B belong to the BO2 zone.

Figure 49
Example of an alternately routed call between a Branch Office telephone in Normal Mode
and a main office telephone

Telephone B calls Telephone A (the user dials DN 5262). In this example,
the call alternately routes to the PSTN. (The PSTN telephone number of
Telephone A is 613-966-5262.)

Nortel Communication Server 1000

Branch Office Installation and Commissioning

NN43001-314

01.02

Standard

Release 5.0

20 June 2007