If your modem is an HCF modem it should work correctly with the Best Data driver, if it does not you have 2 choices. One choice is to go to the modem manufacturer (recommended) for their latest modem drivers. If you have an HSF modem, then please use these drivers.
Note: The generic software offered here should be considered a stop-gap measure only. In all cases, Conexant urges you to contact the manufacturer for drivers or any technical support issues.
Here's other similar drivers that are different versions or releases for different operating systems: