There is a way that you can use the fax and internet at the same time... kinda. But in involves one of those devices like catch a call or whatever they are called. They work by putting the device between your computer and your phone jack. So you are on the internet and browsing or what not and then if you have an incoming call (be it voice call or fax or whatever) the device interrupts your internet connection (temporarily disconnects you) and you are able to answer the phone. I am not sure if these devices will work with software faxes... but you could do some looking into them
