Someone said:
Hi,
I'm using XP and a fax modem which connects to the internet but
can't
send faxes as I'm always getting "Line Busy" message.
Standard faxing using the telephone line, not your internet connect
whether dial-up or broadband (and it you have dial-up internet then it
must be disconnected to do the faxing). If you are using an internet
fax service, you don't even need a fax modem or telephone line (unless
that is your internet connection). You say you are using a fax modem.
That means you need to use a telephone line, and it cannot be busy
with your dial-up connection to your Internet provider else, well,
then it will be busy just as if you were already talking on the phone,
too.