
Chapter 46 Setting up VoIP trunks for fallback 395
Networking Configuration Guide
Absorbed length, Normal schedule: If this is a private network PSTN line, and the network uses a
CDP dialing plan, and the remote system identifier is 2, which is part of the remote system DN
structure, and you specified destination digit of 2 for the remote gateway, then configured a
destination code of 82, set this field to 1, so that the 2 is still part of the dialout.
If the destination code is different from the private access code/destination digits for the remote
system (UDP dialing plan) or this is a public PSTN, enter private access code or the public access
number to the remote system into the External # field on the route record. In this case, set the
absorbed length to the number of digits in the destination code. The system will dial out the
External # you entered in front of the rest of the number that the user dialed.
Setting up the VoIP schedule to overflow
Once you have configured the routing and destination codes, ensure that the Routing Service
schedule allows fallback (Overflow) and allows you to activate the service from a control set. You
will note that the Routing Service does not have a Normal schedule. This is because the Normal
schedule is the schedule that runs when no routing services are active.
To set up the VoIP schedule for routing services
1 Double-click Sched 4 and rename it VoIP (Configuration > Telephony > Scheduled Service
> Schedule Column).
2 Click VoIP.
The VoIP schedule panel appears in the right frame.
3 Change the Routing Svc to Manual.
4 Select the Overflow check box.
5 Next steps:
The following describes some further actions you may need to take to ensure that fallback is
working:
— “Activating the VoIP schedule for fallback” on page 395
— “Deactivating the VoIP schedule” on page 396
Activating the VoIP schedule for fallback
Before activating the VoIP schedule, calls using the destination code are routed over the PSTN.
This is because the system is set to use the Normal schedule, which routes the call over the PSTN.
Once the VoIP schedule is activated, calls made with the VoIP destination code are routed over the
VoIP trunk.
The VoIP line must be activated (FEATURE 873) from the control set for the VoIP trunk, which
is specified when the trunk is created (Configuration > Telephony > Lines > Active VoIP
Lines).
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