Zone-based digit manipulation – Nortel Networks SRG 50 NN43001-307 User Manual

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Dialing Plan configuration

It is possible to divide a system into several zones. It is also possible to
divide a customer within a system into different zones. It is more common to
assign one zone to one system and one customer.

Zone-based digit manipulation

For SRG users in Normal Mode, it may be desirable to provide routing that
is different from that provided to main office users. For example, it may be
desirable to route certain calls directly to the SRG PSTN trunk, rather than
receive the same routing as non-SRG users in the main office.

To achieve this, the Zone Access Code Behavior (ZACB) and Zone Digit
Prefix (ZDP) properties of the branch office zone are used to add digits to the
digits dialed by the SRG user. The resulting digit string is then used to route
the call. The net effect of this is that an SRG user’s and a main office user’s
call can be routed differently, even though the dialed digits were the same.

For example, if 1 87654321 is dialed, where 1 is the Access Code, then:

•

for a main office user, the call is routed based on the dialed digits.

•

for an SRG user, the digits undergo zone-based digit manipulation (such
as inserting 101), and the call is routed based on the new manipulated
digit string (in this example 1 101 87654321).

By performing this zone-based digit manipulation, calls from main office
users and SRG users undergo different routing. Some applications are:

•

routing all SRG user calls to the SRG PSTN trunk

•

routing SRG user local calls to the SRG PSTN trunk

•

routing all SRG user calls to the main office PSTN trunk

•

routing SRG user long-distance calls to the main office PSTN trunk

Special considerations apply in the case where a single Access Code
is used for both on-net and off-net calls, especially when UDP is used.
Routing of on-net and off-net calls is normally different. The Call Server
ESN Special Number provisioning and Gatekeeper Numbering Plan Entry
provisioning should be used to provide this different routing.

In the case where a single Access Code is not shared, that is, where
one Access Code is exclusively used for UDP on-net dialing, standard
procedures should be used. See Dialing Plans Reference (NN43001-283).

For a given branch office, there may be more than one zone defined at the
main office. Therefore, different SRG users may receive different routing
treatments.

Nortel Communication Server 1000

Main Office Configuration Guide for SRG 50

NN43001-307

02.02

Standard

Release 5.0

3 December 2007