A DSL (DSL/ADSL/VDSL) modem is not a fax modem, so you cannot send or receive faxes using this type of modem.  You can continue to use the DSL modem for your internet service, but you will still require to install a fax modem on your computer to use FaxTalk with a traditional phone line. If you don't have a fax modem, you can also use a T.38 fax internet service provider with FaxTalk instead.