
118 Chapter 6 Typical network applications using MCDN
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• Set telephones to receive incoming calls through target lines.
• Configure the PSTN fallback and enable QoS on both systems.
4 Reboot each system.
This system uses fallback to PSTN so calls can be routed across the PSTN connection if VoIP
traffic between the Business Communications Manager systems becomes too heavy.
A similar system is shown below, except that only one of the Business Communication Managers
has a line to the PSTN network. In this case, all public calls from both systems are funneled
through the system with the PSTN connection and all communication between the systems occurs
over IP trunks. To facilitate this system, you need to ensure that the routing codes on the
non-PSTN system point to the system connected to the PSTN, and then, to the PSTN. On the
PSTN-connected system, the system and routing codes must be configured to recognize and pass
public calls from the other system out into the PSTN network.
This also means that if the VoIP trunks are inaccessible between the systems, there is no provision
for a fallback route.
Figure 39 Routing all system-wide public calls through one Business Communications Manager
The Programming Operations Guide provides a detailed description of the configurations required
for tandeming a system over PRI lines. Except for the VoIP trunk requirements, the system and
routing configurations would be similar.
WarehouseHead Office
PSTN
Intranet
VoIP trunk
System
telephone
Business
Communications
Manager
Business
Communications
Manager
System
telephone
Company server
Remote Office
remote
i2004
i2004
telephone
i2004
telephone
i2050 Software
Phone
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