/HANGUP
       /NOHANGUP

    Determines the action that occurs when a session is terminated.
    This qualifier notifies the ASN driver when a modem hangup is
    necessary due to an idle device. For example, when the last
    network connection is closed on a transient line that is set
    to /NOHANGUP, the line switches back to the terminal driver but
    the modem remains connected. This allows users to reaccess the
    line and log in without having to redial and reestablish the
    connection.

    To use this qualifier, you must have PHY_IO privilege, or the
    line must have TT2$M_MODHANGUP already set.