Install conf-isdn-account as follows :

1. Log in as root.

2. Put all three packages in some directory.
   (For example:  /root/conf-isdn)

3. And give the following commands :

   1. cd /root/conf-isdn
   2. dpkg -i isndutils_3.0-12slink14.deb  (Note:  Do not start isdnconfig)
   3. dpkg -i dialog_0.9a-15.deb
   4. dpkg -i conf-isdn-account_1.6-1a_all.deb

Now you can start the tool in the shell with the command  conf-isdn-account.

If you like to start the program in X in a consolewindow, you should first configure the window after starting a new consolewindow as follows :

1. File -> Linux Console
2. Options -> Font -> Linux
3. Options -> Size -> 80x25 (ibmpc)
4. Options -> Schema -> VIM Colors