
Chapter 46 Setting up VoIP trunks for fallback 397
Networking Configuration Guide
Figure 117 Example PSTN fallback
BCM Santa Clara BCM Ottawa
• IP address: 47.62.84.1 • IP address: 47.62.54.1
• DNs 3000-3999 • DNs 2000-2999
• From this system, dial 9 to get onto
PSTN
• From this system, dial 9 to get onto
PSTN
• Dialing plan: CDP • Dialing plan: CDP, destination code is
part of DN
Routing Routing
• Target DN 2244 (first digit is unique
to system)
• Target DN 3322 (first digit is unique to
system)
• Remote gateway destination digit: 2 • Remote gateway destination digit: 3
• Destination code: 2 • Destination code: 3
• VoIP/private network dialout: no
external #, user dials 2244 (no
absorbed digits)
• VoIP/private network dialout: no
external #, user dials 3322 (no
absorbed digits)
Ottawa
Santa Clara
IP network
PSTN
DN 3322
Gateway destination
digit (Ottawa): 2
Route 867 (VoIP)
Route 774 (PRI line)
Route 009 (PSTN line)
Destination code: 2
Route 867, absorb 0
Route 774, absorb 0
Destination code: 9
Route 009, absorb 1
DN 2244
Gateway destination digit
(Santa Clara): 3
Route 867 (VoIP)
Route 774 (PRI line)
Route 009 (PSTN line) with
Destination code: 3
Route 867, absorb 0
Route 774, absorb 0
Destination code: 9
Route 009, absorb 1
Dialout:
14085553322
Dialout:
3322
Dialout:
16135552244
Dialout:
2244
Gateway: 2
Gateway: 3
(Packet Data Network)
(Public fallback line)
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