Hi there.
Other threads have mentioned needing filters ... what are they? where and how are they installed? and ... how can one set a dialup modem (for faxes) to work with a broadband modem ... does it just plug in?
Here is my set up at home.

This is the basic BT wall socket for my phone line. You can see a double connector here. This was fitted when I had my SKy box installed as the set-top box has to be connected to a phone line. The wire on the left goes off to the box. The top connector of the two you see in the picture goes to a FILTER that is provided with the braodband modem. The modem goes into the usb port. The bottom one of the two goes straight to the 56K dial-up modem in the computer that can still be used.
Next is a picture of the filter and wall box.

Next picture is the filter itself. This has a connection that you plug your broadband modem into and on the right is my home phone line.

Hope all this helps...