In order to have an ISDN connection working, you need to have ISDN support enabled through the appropriate kernel modules. You also need to declare the driver(s) module(s) of your internal network card(s). In the following example, we assume that your internal network card is a NE2000 PCI.

To declare your modules, go to the LEAF Packages configuration menu and choose modules. Enter 1) to edit the /etc/modules file and enter the following information:

# 8390 based ethernet cards
8390
ne2k-pci

# Modules needed for ISDN
# Look for type, io and irq settings at help page of isdn.lrp documentation
slhc
isdn
hisax type=   io= irq=

# Masquerading 'helper' modules
ip_conntrack_ftp
ip_conntrack_irc
ip_nat_ftp
ip_nat_irc

the paramater you have to give for a certain card are listed in the table above

as an example: to use Fritz card from AVM(A1) download the module hisax_AVM_A1. rename it to hisax.o. if you fritzcard is configured with irq 7 and ioport 330 you enter hisax type=5 irq=7 io=0x330

Backup the modules.lrp package.