If you have completed the installation instructions, clicked on the 'RTS Dial-Up' icon, then 'Connect', and received a modem error message, there are typically two errors that occur:
1.'No dial-tone detected': Your dial-up connection may be set up correctly but you can still get errors from your modem. For example 'No dial-tone detected' means your phone line is probably not connected or not plugged into the right jack on your modem (There can be two jacks on the back of a modem: one that connects to the wall jack and one for an extra telephone).
2.'Modem not responding': If you get 'Modem is not responding', then your modem was not installed correctly or has the wrong driver. For this you need to see the manual that came with your modem. If your modem was not installed correctly it may be best if you remove the modem from the control panel's modem section and perform a reinstall from the beginning. (Click ‘Start’, then ‘Control Panel’, and then click the ‘Modems Icon’. Select your modem and click remove.) Then perform the installation instructions according to your modems documentation.