Missing PPP adapter in RRAS configuration

Hi All

I've a Windows Server 2003 SP1 running, along with EICON Diva ISDN
(Modem) adapter and RRAS installed and setup.

I see dialin requests in the ISDN (Modem) card management software,
but RRAS is not recognizing anything.

The dialin (modem) ports are all there, and RAS is setup. However, it
seems I miss some steps.

On another (working) system with same configuration I see with
ipconfig /all:

> PPP adapter ras server (dialin) interface:
...

However, on system with failure this entry does not exists.

Re-installing modem driver and RRAS and restart did not help.

Any idea how to manually add the PPP adapter? Where does it come from
usually (modem, RRAS)?

Any help or link would be highly appreciated,

Regard,

Joerg