Centrex - External Callforward over two site -> Wrong number

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Hello all,

i have a question to a specific scenraio.

It is a OXE which is used for several sites.
Centrex is used.
Clip no Screening is active on every site.

Scenario description:

Site 1:

Entity 10
Centrex Prefix 10
Trunk Group 10
DDI table 10
etc.
Installation number 1234
DDI Translation example: External 100 to internal 10100


Site 20

Centrex Prefix 20
Trunk Group 20
DDI table 20
etc.
installation number 5678
DDI Translation example: External 100 to internal 20100

Scenario:

Extension 20100 of site "2" has an external forward to his mobile number.

When 10100 calls the 20100 and is forwarded, then the phone number on the mobile is the 1234-0.
But i want to show the DDI of the caller: 1234-100

I know the reason for this behavior:

The OXE wants to build the calling number for 10100 with the installation number of the entity 10 (In NPD defined "Entity Source") which belongs to 10100 but it searches the internal 10100 in the DDI table "20", because the forwarding extension is in Entity "20".
It cannot find an entry so it gives the suplement Nr. 0 .

The "NPD for external forwarding" doens't seem to help either.

I know only the possibility of using the "private calling number" feature to show the right number but to change 3000 extensions makes no sense.
I guess there must be a better way.

Somebody knows a solution?


Regards