Flexible Length Ddi - NEC UNIVERGE SV8100 Features & Specifications Manual

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UNIVERGE SV8100

Flexible Length DDI is an extension to normal DDI overlap reception. Previously, the system expected

exactly the number of DDI digits that are configured in PRG22-09. With the addition of Flexible Length

DDI whilst insufficient digits are recieved for a match, ISDN timer T302 is restarted with every received

digit. When this timer expires or a SendingCompleteIE indicates that no further digits will arrive PRG22-

09-08 defines whether the call is dropped or transferred to PRG22-12.

The system searchs the DDI translation table for the digits that have been received, this allows the

configuration of different lengths by setting PRG22-09-01 to the maximum length. ISDN timer T302

should be changed from its default setting of 10 seconds to approx 3~4 seconds to avoid excessive wait

times before receiving ringback tone.

DDI Translation

Once the received number is defined as complete by T302 expiry or SendingCompleteIE

reception, the system will search the DDI translation table for an exact match e.g. 22 matches 22

not 222 or 922 etc.

The DDI matching algorithm allows the use of wildcard characters that are defined by the '@'

symbol. Each '@' in 22-11-01 matches exactly on digit at the same position in the DDI i.e. the

received DDI 123 matches @23, 1@3, 1@@, @@3 and @@@ but not @123, 123@, 12@3

Wildcard Translations

When an entry in 22-11-01 matches the received DDI, the target number in 22-11-02 will be

modified if there are wildcards in 22-11-01. Each received DDI digit that matched an '@' in the

table, will be appended to the configured target number.

This allows for quick configuration of a complete tange of DDI numbers that shall translate to

another range. Normally this is used by companies that have a digit added (prefixed or postfixed)

for FAX or voicemail access.

Flexible Length DDI

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