I would appreciate any suggestions that lead to solving this problem, the machine is a laptop Toshiba 4300 Satelite Pro running Windows 98. Below is a list of things i've tried already without success.
• Confirmed the reported problem
• Tried using an alternative cable
• Downloaded the latest device drivers
• Uninstalled the current drivers
• Installed the latest drivers
• Tried another ISP
• Disabled wait for dial tone
• Communication with modem failed due to “Port Open”