WinxpFaxing

Hi
When i try to send a fax using winxp fax console it says that there is no line available, and when i try to configure the fax services it says there is no modem installed. I Use an ISDN adapter in my PC and windowsxp do not recognise it as a modem so how do i get around to tell windows to use COM2 of my ISDN adapter to send faxes? Any suggestions please?
Thanks