|You need to connect the fax to a phone or non-filter line. Most modems have two connections. One of them would go to the non-filter and the other is for a normal phone. In this case you substitute a fax for the phone. Or you can buy a two into one for adding a line to phones. Might be $3.|
Most modems know the difference between a phone call and a fax. Yours may have an option but may involve the type of service. Since you have dsl I'd guess the line is new enough.
Why did it take me over a year to phone in a problem to ATT?