[Dialer Defaults]
;In your case /dev/ttyS0
Modem = /dev/modem
Baud = 460800
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ISDN = 0
Modem Type = Analog Modem
Phone = 53289928
Username = myusername
Password = mypassword
Idle 0