Nortel 1000 Configuration Manual page 162

162 Alternative Call Routing for Network Bandwidth Management
How Alternative Call Routing for NBWM works
When a user dials a station-to-station call between two different zones (that
is, the calling and called telephones are not located in the same geographic
area) and the bandwidth limit has been reached, then the Alternative Call
Routing feature is invoked.
The following steps occur in Alternative Call Routing scenarios.
Call from branch office telephone in Normal Mode
1. The interzone station-to-station call is attempted. There is insufficient
2. The main office inserts the ALTPrefix associated with the originator's
3. The main office uses Coordinated Dialing Plan (CDP) or Vacant Number
4. A request is made to the NRS in order to determine the endpoint. The
5. The call is routed on the virtual trunk to the branch office.
6. The branch office treats the ALTPrefix as a steering code. The
7. The call is routed over the PSTN/MCDN trunks to the telephone at the
Call from main office telephone to branch office telephone
1. The interzone station-to-station call is attempted. There is insufficient
2. The main office inserts the ALTPrefix associated with the originator's
3. The main office uses CDP and recognizes the ALTPrefix as a steering
4. The main office determines the RLI and uses a DMI to change the
5. The call is routed over the PSTN/MCDN to the telephone at the branch
With the ALTPrefix digits inserted, the resulting number must be one that
CDP or VNR software can process as a steering code.
Copyright © 2005-2007, Nortel Networks
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bandwidth available to make the call.
zone (the branch office in this case) before the dialed digits.
Routing (VNR) to route the call to a virtual trunk.
NRS returns the branch office address as the endpoint.
branch office determines the Route List Index (RLI) and uses a
Digit Manipulation Index (DMI) to change the dialed number into a
PSTN/MCDN format number.
main office or other branch office.
bandwidth available to make the call.
zone (the main office in this case) before the dialed digits.
code.
dialed number into a PSTN/MCDN format number.
office.
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007