From Redhat 7.0 and above, you should have wvdial. You can run wvdialconf to set up any attached modems, then run wvdial & to dial it up.
See the man pages for wvdial and wvdialconf, if you are using a Redhat-derived linux.
Im using Linux Mandrake 7 and i tried to config the modem from the kde but no way i don't even know what's the problem whith that if you can help and tell what's the prpblem please do here's what it says:
Fornitore: SGS Thomson Microelectronics
Modello: 56k SoftModem
Kernel Module: unknown
Tipo di Bus:: USB
Modem Device /dev/ttys0 (in windows the modem is on com1 how ever i tried all the ttyS1 2 and 3)
Flow Control CRTSCTS(when i trie the xon/xoff the modem is fownd by the system but it still does not work the modem is not on when i use CRTCTS it says modem not ready or modem not responding)