* recently I started using my old internal dial up modem as a *faxing machine through Windows XP. *After configuring it, *it worked correctly for one or two times. *But now I'm unable to send & *receive fax. *it tells ' no dial tone' *or at times 'no *answer' . *when I *picked up & *listened the receiver ( when faxing m/c is not active) I just hear a *humming voice & *there is no dial tone. **but when I *by pass the modem & *connect my phone directly there is no *problem. *telephone works fine.