
Chapter 4 VoIP Trunk Configuration 61
IP Telephony Configuration Guide
Figure 25 PSTN fallback diagram
Before configuring fallback, you must have both your VoIP trunk and your fallback line properly
configured and line pools created for each. For information on creating a VoIP line pool, see
“Putting VoIP lines into a line pool” on page 57. You create a PSTN line pool in the same manner.
Ensure that you use a different line pool for PSTN lines than for VoIP lines.
Setting up PSTN fallback includes:
• Setting up a VoIP schedule
• Configuring routes
• Creating a destination code
• Configuring digits
• Activating the VoIP schedule
• Turning on QoS monitor
Setting up a VoIP schedule
Setting up a VoIP schedule allows you to create two different call routes for a single destination
code. One of these is a VoIP route. The other is typically a PSTN route. The PSTN route uses the
‘Normal’ schedule which runs when no other schedule is activated.
To set up the VoIP route:
1 In the Unified Manager, open Services, Telephony Services, Scheduled Services, Common
Settings, Schedule Names:
BCM A
BCM B
IP network
PSTN
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