Your best bet here is to actually post the brand and model of modem you're looking at. (Pardon my dangling preposition.)
Also, if you are looking for a modem to buy, many suggest an external modem, such as the ZOOM 3049, which I have.
I have not read that the DSP (digital signal processor??) makes the modem a 'hardware' modem, but I could be wrong about that.
Here's another thread about modems that mentions DSP.
http://www.linuxquestions.org/questi...threadid=55862
Don't V.92 features have to be supported by you ISP? Sorry, I'm not yet familiar with V.92 support in Linux, although my modem is a V.92 modem.
good luck...