
366 Chapter 37 Private networking: PRI and VoIP tandem networks
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Calls originating in the private network
Table 88 describes how each node handles calls originating in the public network.
Node A Ottawa
PSTN
An external user in Calgary dials a 761-xxxx number which is answered with DISA. User
enters a CoS password and an Ottawa public network number.
Incoming interface: Public
DN type: Public
Destination: Local (DISA DN)
Node A receives it and identifies it as being for C. Uses the private trunk to route the call
to C.
Incoming interface: Local (DISA user)
Destination: Remote PSTN
Node C receives the call and identifies it as a public number and routes it out over the
local PSTN.
Incoming interface: Private
Destination: Local PSTN
Table 88 Calls originating from the private network within a tandem network (Sheet 1 of 2)
Received Destination Description
Node B Node B DN is internal, therefore no trunk routing is required.
Incoming interface: Intercom
DN type: Local
Destination: Local
Node A Ottawa
PSTN
User in Node A dials the private network access code for Node C, followed by an
Ottawa public number.
Incoming interface: Intercom
DN type: public
Destination: Remote PSTN
Node C receives the call and identifies it as being for the public network. Node C routes
the call over the local public network.
Incoming interface: Private
DN type: Public
Destination: Local PSTN
Node B Calgary
PSTN
User on Node B dials a public DN.
Node B recognizes it as being the responsibility of Node A and uses private trunk to
route the call to A.
Incoming interface: Intercom
Destination: Remote node
Node A receives the call and identifies it as being for the public network. Node A routes
the call over the local public network.
Incoming interface: Private
Destination: Remote PSTN
Table 87 Call originating from the public network to a tandem network (Sheet 2 of 2)
Received Destination Description
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