In trying to fax from my computer, I received a message box saying 'Please plug the phone line into the modem'. I hit 'OK' because the phone line is already plugged in.  I then get prompts that the fax is sending however, the recipient never gets it.  They say their fax indicates an incoming fax, but nothing comes through (and, yes, they do have paper in their fax machine). On my PC, the prompt says the call was answered which indicates to me the fax was sent. Is there something I need to do?  Am I missing something? Appreciate any comments.