
334 Chapter 32 Public networking: Tandem calls from private node
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Dialing plan/Routing:
• Coordinate Dialing plan with private network node.
• Assign each line pool to a route
• Create destination codes for the private network node, and the public network, using the
appropriate routes. On public route, drop the public network access code off the dial string. On
the private route, drop the private network access code off the dial string.
Telephones:
• System telephones are not involved in tandem transactions. However, for calls destined for the
system, ensure that the telephones have the appropriate line/line pool assignments to receive
calls from both the public and private networks.
Caller access on a tandem network
In this type of configuration, there are three types of callers:
Each type of caller has a specific method of accessing the other two systems.
Callers using BCM
These callers can:
• call directly to a specific telephone
• select an outgoing line to access a private network
• select an outgoing line to access features that are available on the private network
• select an outgoing central office line to access the public network
• use all of the BCM features
Callers in the public network
These callers use the public lines to:
• call directly to one or more BCM telephones
• call into BCM and select an outgoing TIE line to access a private network
• call into BCM and select an outgoing central office line to access the public network
• call into BCM and use remote features
Callers in the private network node
These callers use private lines to:
• call directly to one or more BCM telephones
• call into BCM and select an outgoing TIE line to access other nodes in a private network
• call into BCM and select an outgoing central office line to access the public network
• call into BCM and use remote features
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