use the command

# pppconfig

to create a dialup connection. u need root privileges to do this. u have to
know the name of the modem device. y'l find out how it works.. its an
interactive tool to config dialup connections. just find out the name of
your modem device. If u're not connecting it to your com ports, then monitor
the System->Administration->system log and then connect the modem to the
computer. the name of the device will show up in the system log