Hey, isn't this the Slackware forum?
A fast search in the Vector forums (vectorlinux.com/forum1) gives the result that the modem does not run out of the box, but there seem to be a workaround (vectorlinux.com/forum1/index.php?topic=6716.15). You can also search the old Vector forums (ibiblio.org/vectorlinux/forum/search.php) for more info