When using the AccelePort RAS adapter in Linux with mgetty, the modem does not appear to hang up and stays off hook.
The following init-string is recommended in order for mgetty to force a hang-up. Add the following entries to /etc/mgetty+sendfax/mgetty.config. In the following example ttyG0_03 is the tty ID for the AccelePort RAS port:
init-**** "" \d\d\d+++\d\d\dATQ0V1E0 OK AT&S0&D2&K3S0=0 OK