DIRECT DIALING INWARDS CALL SERVER : TELEPHONE FEATURES
Ed. 042/4 Réf. 3EH 21000 BSAA
Configuration
T Configuring the installation number:
T Filling in the substitution table:
T Completing the DDI numbering plan:
Activation/Use
Functional analysis
A "DDI with more than 4 digits" mechanism is based on the analysis of all the received digits. They are
modified using a substitution table and analyzed by the Public numbering plan. Programming such a
mechanism requires you to have a global view of your DDI sequences.
Procedure to follow
- check the DDI sequences
- deduce the installation number by removing the "intercity prefix", "intercity code" if found
- deduce the minimum number of digits required to cover the DDI ranges
- analyze the remaining digits and create the DDI modification table
- configure the DDI numbering plan
- activate the mechanism
Application using the above example
- DDI sequences:
• 1st sequence: 1 41 23 40 10 to 1 41 23 40 19 for stations 120 to 129
• 2nd sequence: 1 41 23 41 00 to 1 41 23 41 19 for stations 130 to 149
- 3rd sequence: 1 41 33 40 15 to 1 41 33 40 24 for stations 150 to 159
- Deduction of the installation number:
Digits 1 41 are common to the 3 sequences of DDI numbers: these 3 digits will make up the ins-
tallation number. THE "INSTALLATION NUMBER" FIELD CAN BE LEFT EMPTY IF THERE IS NO
COMMON DIGIT.
- Deduction of the minimum number of digits to cover the DDI ranges:
1 or 2 digits, at least, are necessary in order to join a series of stations.
• 1st sequence: 1 41 23 40 1 0 to 1 41 23 40 1 9: 10 stations with 1 digit (0 to 9)
• 2nd sequence: 1 41 23 41 00 to 1 41 23 41 19: 20 stations with 2 digits (00 to 19)
- 3rd sequence: 1 41 33 40 15 to 1 41 33 40 24: 10 stations with 2 digits (15 to 24)
- analysis of the remaining digits (by removing the installation number and the digits necessary to
- by MMC-PM5 (Expert View): Numbering -> Installation Numbers
-by MMC-Station: Global -> InsNum -> Public
- by MMC-PM5 (Expert View): Numbering -> DDI Number Modification Table
-by MMC-Station: Num Pln -> PubNMT
- by MMC-PM5 (Expert View): Numbering -> Public Numbering Plan
-by MMC-Station: NumPln -> PubNum