Library /sys$common/syshlp/nclhelp.hlb set, modem_connect, line, modem_options  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Default: No options        Value: Set of options

    Set of values that determine the capabilities of the modem. The
    value dialout is supported only if the value of communications
    type is switched. You can modify this characteristic only
    when the entity is disabled.

    dialout          The modem can dial the remote modem.

    direct           The modem is directly connected to the remote
                     modem through a non-switched line.

    rate select      The modem is capable of data rate selection.

    The value direct must be accompanied with dialout and used only
    when the modem protocol type supports direct dial.

    Format the values to specify one or any combination of modem
    options.