Upgrade your Conexant HSF Generic Modem. Please understand that the modem drivers you will be installing are intended for basic modem operations and are generally not supported.
Note: If your modem is not supported in Windows XP inbuild driver, then XP will ask for you to point windows to the drivers, which we recommend to Cancel. You need to contact the modem manufacturer for a WinXP suitable driver or you can use the WinXP driver that Conexant provides for the HSF modem.
Here's other similar drivers that are different versions or releases for different operating systems: