asterisk users - Oct 2003 - AVM ISDN card now working but unable to place calls

Thanks to "WipeOut" who told me how to install the AVM fritz card. I
think
asterisk is working, no errors or warning by starting asterisk. Now I'm in
trouble with the configuration files. I want to place calls over the ISDN
network using an IP phone from Micronet. How can I setup the system? Thanks
everybody who can help me.