modems

Regardless to what modem I use none of them will work on SUSE 9
conextant and lucent do not work nor does
swann, linkpro, netcom, phillips, digital, sharp,
3com or dynalink
I am runnig AMD 2400, 256mb ddr 400 scsi and ide

all modems are new and have been tested with windows xp and are all working
where do I go from here