
364 Chapter 37 Private networking: PRI and VoIP tandem networks
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The following tables show the routing tables for Node A and Node C for external and internal
terminating calls.
Routing calls through a tandem network
The following provides a step-by-step description of how calls network through a tandem network.
• “Calls originating from the public network” on page 365
Table 83 Node A destination code table, external termination
Route Absorb length Destination code (public DNs)
4 (PSTN) 1 91604
3 (Node B) 0 91403762 (Node B)
4 (PSTN) 1 9140376* (not internal network)
4 (PSTN) 1 914037* (not internal network)
4 (PSTN) 1 91403* (not internal network)
4 (PSTN) 1 9* (not internal network)
* This wild card represents a single digit.
Table 84 Node A destination code table, internal termination
Route Absorb length Destination code (private DNs)
3 (Node B) 0 392 (Node B)
5 (Node C) 0 393 (Node C)
Table 85 Node C destination code table, external termination
Route Absorb length Destination code (Public DNs)
3 (Node B) 0 91613764 (Node D)
3 (Node B) 0 91613766 (Node F)
4 (PSTN) 1 9161376* (not internal network)
4 (PSTN) 1 916137* (not internal network)
4 (PSTN) 1 91613* (not internal network)
4 (PSTN) 1 9161* (not internal network)
4 (PSTN) 1 916* (not internal network)
4 (PSTN) 1 91* (not internal network)
4 (PSTN) 1 9 (not internal network)
Table 86 Node C destination code table, internal termination
Route Absorb length Destination code (Private DNs)
5 (Node A) 0 391 (Node A)
5 (Node A) 0 392 (Node B)
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