How goes ISDN with qnx 4.25

I have 2 computers and between this is a telephone system. There i have 8 numbers wich i can use vor the internal ISDN. How can I teach the ISDN card which number it have? Or don`t the card need it?
The driver vor it is the capi-driver and it is a stollmann card.

The idea would be to contact IDEA SOFT
They have written the QNX driver for the Stollmann boards.