Mitel 430 - Direct Dialling Plan (DDI plan)

Routing elements
117
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
5. 4 Direct Dialling Plan (DDI plan)
Fig. 54 Direct dialling plans in relation to the other routing elements
Direct dialling is used to reach internal users directly from the public network or from
another PINX. The incoming call is linked with a call distribution element 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 start-
ing from the left using the setting DDI cut in the trunk group configuration.
76
54
31
73
5
8
9
1
6
1
23
1
2
3
4
5
8
9
Special destinations (PSTN overow, voice mail, mobile phone integration,
IP remote management (SRM), modem
Net-
work
side
Incoming calls
Outgoing calls
Changeover one or several
switch groups
ACD Server
ACD queue
External remote control
Transfer
General bell
KT Lines
Key
telephones
Direct Dialling Plans
User side
User congurationsUser groupsCall distribution
elements
Routes
Trunk groups
Network interfaces
Queue with announcement