I don't know if there is a convenient way (I mean - a tool of their own to make this easy on you...) to do this in fedora, because I dont know fedora - but the way it will work with all versions of linux is to go and use "wvdial" or (actually this should be AND!) to read through at least one HOWTO on setting up pppd - to get the picture of how it is supposed to work.
This address should get you started:
http://www.tuxfinder.com/LDP/FAQ/
I or someone else could help - but you will have to do the work!
Check on fedora - how their users are supposed or advised to do it...
I know of Debian - they have a very powerful little tool called pppconfig, which makes this really easy on you - look for something similar...
It is your decision, how you do it - I'd recommend the Debian-tool but I dont know if you can install that without problems - because it's made for a Debian-system.
Happy reading!
