Nortel 1000 Configuration Manual page 170

170 Alternative Call Routing for Network Bandwidth Management
6. The call terminates on IP Phone B from the PSTN in the BO2 zone
A call from a branch office telephone to another branch office
telephone
Figure 70 "Call between a branch office telephone and another branch
office telephone" (page 171)
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 Normal 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.
Copyright © 2005-2007, Nortel Networks
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insert 966 (in order to compose the DID number of the destination
telephone which is 9663121, a local call.)
(action labeled 3 in Figure 68 "Call between a main office telephone and
a branch office telephone" (page
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
168)).
shows an alternately routed call between three