Nortel BCM50 Configuration Manual page 397

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