I have a client who wants to set up a fax server in their office. I'd like to use HylaFAX under Ubuntu, but I'm a little shy to spend money on hardware for Linux, particularly a modem given the whole Winmodem issue. So to ask two different questions in the same post:
First, what are the most reliable ways to tell if a modem is supported in modern releases of Linux? It's nice when a manufacturer specifically mentions Linux support. Failing that, do you check the kernel docs? Chipset type? Other keywords on the modem's spec sheet?
Second, what specific modem would you recommend?