Aastra Ascotel IntelliGate 2065 - 4.3 Direct Dialling Plan (DDI plan)

Ascotel IntelliGate 2025/2045/2065
Part 2 Routing elements 223
4.3 Direct Dialling Plan (DDI plan)
Fig. 2.33: Direct dialling plans in relation to the other routing elements
Direct dialling is used to reach internal subscribers directly from the public net-
work or from another PINX. The incoming call is linked with a call distribution ele-
ment on the basis of the call number's direct dial portion.
Within a direct dialling plan, number ranges are created by agreement with the
public network operator; these numbers match up with the anticipated direct dial
portions of the call numbers. In a three-digit direct dialling plan, for example,
number ranges of 300…399 and 500…549 are created.
Depending on the country in which the PBX is operated, the ISDN public exchange
may send the complete call number or only a part of it. If the complete call
number is sent, the digits that do not form part of the direct dialling number can
be truncated starting from the left using the setting "Truncate DDI" in the trunk
group configuration.
Network
connections
Trunk
groups
DDI plans
Routes Call distribution
elements
User groups Subscriber
configurations
Subscriber
side
Network
side
1
2
haz0698aaena0
Key telephones
KT lines
Changeover switch for one or
more switching groups
Outgoing calls
Incoming calls
1
Operator console(s)
2
External Remote Control
4
ACD server
5
ACD queue
General call
3
1 3
3
4 5