Nortel Networks NN43001-314 - Manual (Page 91)

Dialing Plan Overview 91
Bandwidth utilization for the Branch Office is tracked at the main office and
can be displayed in LD 117 using the PRT INTERZONE command. To
provide the correct bandwidth utilization to the main office Call Server,
when a Branch Office is calling another node in the network, the calls must
be tandemed through the main office Call Server in both the inbound and
outbound direction.
Entering the main office Gateway endpoint identifier in the Tandem Endpoint
field for each Branch Office gateways configured on the NRS only provides
tandeming in the outbound direction from each Branch Office (from Branch
Office to main office).
To tandem calls through the main office in the inbound direction (from main
office to Branch Office), one must make use of the dialing plan capabilities
of the CS 1000 to first route the call to the main office. The main office
prepends a prefix to the dialed number and the number is routed to the
Branch Office.
Tandeming all Branch Office calls through the main office allows the main
office to keep track of the bandwidth being used at each Branch Office.
Application
This feature applies to the Branch Office and the Adaptive Bandwidth
Management feature. Specifically, it applies to calls made to and from the
Branch Office from either telephones registered locally at the Branch Office
(digital, analog [500/2500-type], and IP Phones) or trunks at the Branch
Office to another node in the network. It does not apply when using Branch
Office IP Phones that are registered with the main office (for example,
Normal Mode).
Dialing Plan Overview
Depending upon the type of dialing plan used in the network (Coordinated
Dialing Plan [CDP], or Uniform Dialing Plan [UDP] or a combination of both)
the general idea is to have all calls that are terminating at a Branch Office
first dial a number that will get routed to the main office associated with that
Branch Office. The main office recognizes this number as belonging to
the Branch Office and appends a tandem prefix to this number using Digit
Manipulation Index (DMI). The main office then routes the call to the Branch
Office while accounting for the additional bandwidth used.
See Figure 25 "A call between two branch offices tandems through the main
office" (page 92) for an example of a tandem call.
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
.