I am trying to get the Windows XP Pro Fax service working, but I keep getting the same error message, i.e., "No dial tone. Line is either in use or not connected". I get fax tones when I dial from my land phone. Can anyone help, please, before I go mad. I have a shop-built computer with 56k Fax Modem, used on the Sky broadband system with a filter on the phone line socket.