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BCM 4.0 Networking Configuration Guide
Chapter 37
Private networking: PRI and VoIP tandem networks
PRI trunks and VoIP trunks can be used to create a private network between other BCMs. This
tandem network provides you with the benefits of end-to-end name display and toll-free calling
over the PRI or VoIP private link. Each BCM becomes a node in the network.
This section includes the following information about tandem networks:
• “Routing for tandem networks” on page 363
• “Routing calls through a tandem network” on page 364
• “Using VoIP to tandem systems” on page 367
Figure 121 demonstrates a tandem configuration.
Figure 121 Private tandem network of BCMs
Also refer to “Using VoIP to tandem systems” on page 367 for other examples of tandem systems
using VoIP trunks.
Routing for tandem networks
In this type of network, each Business system node is set up to route calls internally as well as to
other nodes on the system. Each node must have a unique identification number, which is
determined by the type of dialing plan chosen for the network.
VoIP trunks require local gateway configuration and either remote gateway or Gatekeeper
configurations that identify the other nodes in the network.
If the node is also connected to the public network, the usual routing is required for that
connection.
PRI or VoIP line
PRI or VoIP line
PRI or VoIP line
Calgary Ottawa
Local
PSTN
Local
PSTN
Node A
Node B
Node C
Public:
403-761-XXXX
Calgary network routes only
area codes 403 and 604
Public:
613-763-XXXX
Ottawa network routes all area
codes except 403 and 604
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