[wlug] External modem getting Fax to work

I have an old fax modem 33k that I would like to set up as a fax. when I run the automatic dectection as a modem it detects the device as /dev/ttyS0 . However when I try it out as a fax it looks for /dev/modem which it does not find and looking in the dev directory it doesn't exist So I was wondering if I should create a file and put symbolic link between the files. But I don't really know how to do this