but not with your broadband connection. You can still use your Supervoice program with the dial-up modem to receive faxes and as an answer-phone. It just makes setting up a little bit more difficult, but as you are already set up for it you should find it OK.
You will need the dial-up lead in the telephone socket of the filter and the broadband connection in the other one, if you want a telephone as well then use an adaptor after the filter to split the line for the dial-up modem and the telephone. It sound complicated but can be done easily if you think about it carefully.
I have a couple of PCs like that at work.