Your NBX already has one...

Under Dial Plan, Operations, select Default File, on the pull down list, select UK-3-digit.txt or UK-4-digit.txt, and click Open.

Yes I know but it is really basic. I was hoping to see something a bit more complex so I can better understand the DDI routing and outbound CLI mapping.

see flow chart , starting to note1

PreTranslator Create 2 Incoming DDI
/                         PreTransId Entry Digits
/                         ---------- ----- ------
PreTranslatorEntry Create          2     1 118023
PreTranslatorEntry Create          2     2 118023411

note1: if ISDN trunk is assigned to this pretranslator, when present
incoming call and the match with the DDI number , the system heads at the note2 pretanslator_operation,
if not match the call ,the call route to parameter  programmed in the auto-extensions ISDN Pri/BRI group


note3: The pretranslator for the outgoing CLI it acts on 3 items:
  

PreTranslatorISDNNumberType 5 2

note4:  step1- ISDN number type, defined with the provider which it identifies that type of call comes carried out
towards the carrier (unknow, national, international)

/                         PreTransId Entry Digits
/                         ---------- ----- ------
PreTranslatorEntry Create          5     1 4
PreTranslatorEntry Create          5     2 412


note5:step2-it comes carried out a match on the base of the hundred begins them of the internal plan of numeration see note6


/                             PreTransId Entry OperId Operation  Value
/                             ---------- ----- ------ ---------  -----
PreTranslatorOperation Create          2     1      1 stripLead  6
PreTranslatorOperation Create          2     2      1 replace    9

note2 : the system in case see isdn called number 118023 striplead the first 6 digit , and it leaves to pass the ulterior digit
the system in case see isdn called number 118023411 replace all digit and make internal 9 ( attendant ). The call route in NBX
towards the TABLE to which they are it assigns ISDN Trunk  (TABLE 2 normally).

PreTranslatorOperation Create          5     1      1 prepend    118023
PreTranslatorOperation Create          5     2      1 replace    118023444

note6: step3- they come carried out of the manipulations of transmission of the outgoing CLI towards the provider
In order to assign the trunk to the method of cli, to act on netset in dialplan /pretranslator/device using cli
Example :if the system match any internal beging first digit 4 ( 400/401/402 ecc...ecc..) and place call towards provider ,
digit manipulation ISDN CLI prepend 118023+4xx ( final result isdn CLI 118023401
Example : if the system match 412 place callout towards provider , digit manipulation replace 118023444 .


sorry for my english