Nortel Networks NN43001-314 User Manual

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Alternative Call Routing for Network Bandwidth Management

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. Telephones B and C and the Branch Office belong to the BO2 zone.

Figure 51
Example of an alternately routed call between a main office telephone and a Branch Office
telephone

Telephone A calls Telephone B (the user dials DN 3121). In this example,
the call alternately routes to the PSTN. (The PSTN telephone number of
Telephone B is 613-966-3121.)

Configuration required

Configure the following:

At the main office:

•

Use one of the dialing plan software packages to process the call, such
as CDP or NARS.

•

Provision an ALTPrefix for the BO2 zone.

•

Provision the ALTPrefix as a Steering Code. Build a Route List Index
(RLI) so these calls go to the virtual trunk or configure the Vacant
Number Routing feature to do the same.

•

Provision the ALTPrefix as a Steering Code. Build a Route List Index
(RLI) and Digit Manipulation Index (DMI) associated with this steering
code that can alternately route calls to the PSTN.

Nortel Communication Server 1000

Branch Office Installation and Commissioning

NN43001-314

01.02

Standard

Release 5.0

20 June 2007