XP wont recognise my modem?

I would like to upgrade to windows XP from 98SE, however when i install XP and try to find the modem which works fine with 98SE, C/W XP driver for my Intel ham data fax voice modem. I cannot find my modem listed, there only appears in the list ''standard 56k modem'' which i've tried to use, but windows tells me i'm using the best driver already but flags hardware failure when i try to go online...everything works fine when I've uninstalled XP and revert back to 98SE. XP does warn this modem will need an updated driver on installation.