Error 680 No dial tone
This problem tends to occur between the modem and the phone line
 

• Make sure your telephone line is connected to your modem. Insert one end of the telephone wire into the wall socket and the other end into the back of the modem. When connecting the telephone line to the back of the modem, select the socket marked "Line" or "Telco".
   
• Unplug all other devices attached to the telephone line ( e.g. personal answering machine), and make sure your telephone receiver is on the hook.
   
• If you have a call minder or answering service, check and clear your new messages. This occurs because the call minder gives a series of tomes to tell you you have new messages which can sometimes interfere with the modem dial tone
   
• Run modem diagnostics which are available from the modem icon in the control panel to ensure your modem is responding
   
   
  
   
  
   
• Restart your PC
   
• Attempt dialling from your handset to the intended number excluding the 1470. If you cannot establish a connection this indicates a problem with your phone line. If it connects it indicates a problem with your PC or modem.
   
• Reinstall the modem using the modem providers software