IBM International ISDN User Manual page 105

12. Click "Add" again and repeat the steps outlined above
for each modem emulation you want to add. Note that
you cannot assign a COM port to more than one modem
emulation. When you have finished adding modems,
click "OK" in the "Phone And Modem Options" dialog
to complete the installation.
cFos is now ready to use with your IBM International ISDN PC
Card.
ISDN PC Card – 11 Implementations of the IBM International ISDN PC Card
Windows XP Home Edition and Professional
105