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138 Alternative Call Routing for Network Bandwidth Management
Example: ALTPrefix assigned is 777. The dialed number becomes 777
3121.
4. The call is routed by CDP or VNR to the outgoing route using an RLI.
Example: 7773 is a steer ing code, translated to go to an RLI where
there is one entry, a PSTN trunk route.
5. The main office manipulates the digits and the call is routed to the PSTN
in the MO zone (action labeled 2 in Example of an alternately routed call
between a main office telephone and a Branch Office telephone).
Example: Use DMI to delete and insert digits on the PSTN trunk route.
•
delete 3 digits (remove the ALTPrefix 777)
•
insert 966 (to compose the DID number of the destination telephone
which is 9663121, a local call.)
6. The call is routed through the PSTN and arrives at the Branch Office.
The call is treated as an intrazone zone call and is carried through the
PSTN trunk, terminating at IP Phone B in the BO2 zone (action labeled
3inFigure 51 "Example of an alternately routed call between a main
office telephone and a Branch Office telephone" (page 136)).
A call from a Branch Office telephone to another Branch Office
telephone
Figure 53 "Example of an alternately routed call between a Branch Office
telephone and another Branch Office te" (page 139) shows three systems:
one main office and two branch offices.
All three systems are configured with the same Virtual Private Network
Identifier (VPNI). All systems have virtual trunks.
The Wide Area Network (WAN) is shown with a gatekeeper/Network Routing
Service (NRS) that can be co-resident with one of the Signaling Servers.
Telephone F belongs to Branch Office 1 in Normal Mode and telephone B
is a Branch Office 2 telephone in Nor mal Mode.
There are three bandwidth zones indicated by the dashed lines (main office
zone [MO zone], Branch Office zone [BO2 zone], and Branch Office 1 zone
[BO1 zone]). Telephone F and Branch Office 1 belong to the BO1 zone.
Telephone B and the other Branch Office belong to the BO2 zone.
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
.