What have you tried with wvdial? I don't use red hat, but I use wvdial without any problems at all.
There are a couple of things you need to do:
PHP Code:
wvdialconf /etc/wvdial.conf
- then edit this file with your phone number, password,
username
PHP Code:
vi /etc/ppp/pap-secrets
add username * password
- This is not always necessary, but I've yet found an ISP where I haven't needed to use it.
If you want a normal user to be able to dial, you'll have to change permissions on some files also.