Ascotel IntelliGate 2025/2045/2065
Part 3 Planning a private network 701
Fig. 3.78: Networking with Centrex
System 1 is connected with Centrex. A DDI range 200...299 is defined there.
I. e., Centrex regards all numbers 200...299 as internal numbers in the Centrex
range in system 1.
The Centrex range also contains other internal numbers, e.g. 300 and 350.
If subscriber 300 wants to reach subscriber 250, he simply dials 250.
If subscriber 300 wants to reach a subscriber in the public network, he dials 0
(exchange access prefix) followed by the subscriber number, e.g. 032 6241399.
For the operation to be exactly the same for a user of system 1, you need to set
up the following configurations.
1. All the subscriber numbers in the Centrex range, i.e. 300 and 350, are created
as PISN subscribers in system 1.
2. A route is defined (route 2) with the trunk group (trunk group 1) that contains
all the exchange lines to the Centrex. PISN subscribers 300 and 350 are allo-
cated the corresponding route (route 2). The protocol in the trunk group must
be configured to DSS1 and the type to "Public".
3. An additional route (route 1) is defined for calls to the public network. This is
the route configured as the route for exchange output for internal subscrib-
ers. Trunk group 1 is also configured in this route.
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PINX 1
DDI 200.. 299
200.. 299
300
Centrex
350
Transition
250
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