Dell Latituude CPI Connection Problem

I have Dell Latituude CPI connection problem. The system see the modem (sportsman) in device manager and it say all is working properly. But when I load Netscape ISP software, the system is unable to make the connection between the modem and the software. I reloaded the drives that were already there, I remoreed and reinstalled the modem logiclly and physically. Anyone with any idea would be welcomed. Its running on OS win98 2nd.