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DIRECT DIALING INWARDSCALL SERVER : TELEPHONE FEATURES
Ed. 04 3/4Réf. 3EH 21000 BSAA
cover the DDI ranges) and creation of the DDI modification table:
• 1st sequence: 1 41 23 40 10 to 1 41 23 40 19
• 2nd sequence: 1 41 23 41 00 to 1 41 23 41 19
- 3rd sequence: 1 41 33 40 15 to 1 41 33 40 24
The remaining digits are to be replaced by the substitution digits ,which, themselves, will be ana-
lyzed in the DDI numbering plan. To do this, apply the following rule:
Minimum number of digits to cover the DDI range + Length of the substitution number =
4 (i.e. the maximum number of digits as defined in the DDI numbering plan).
For example, one can:
• for the 1st sequence: substitute "23 40 1" by "810" (in fact, "810" + 1 digit from 0 to 9 = 4 digits)
• for the 2nd sequence: substitute "23 41" by "82" (in fact, "82" + 2 digits from 00 to 19 = 4 digits)
- for the 3rd sequence: substitute "33 40" by "83" (in fact, "83" + 2 digits from 15 to 24 = 4 digits)
- Creation of the DDI numbering plan (from the DDI numbers modification table):
Result of the above example
The DDI number received from the network (here, XX 1 41 33 40 20) is analyzed by the system as
follows:
- removal of any intercity prefix, etc... as well as the installation number: leaves the number 33 40
20.
- analysis of this number in the substitution table (the mechanism being authorized, this analysis is
carried out automatically for all DDI numbers received): the system deducts the number 8320
- analysis of the DDI number thus obtained in the DDI numbering plan: the system makes station
155 ring.
Function Begin End Base
Station -- 9 120
Station -- -- 130
Station -- -- 150
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