VMS Help DECnet-Plus, DCL Commands, SET, HOST, /X29, Qualifiers, /CCITT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /NOCCITT

    (Default=/NOCCITT)

    If you use this qualifier and do not specify a DTE address you
    may only use the /LOG, /PARAMETER, /VMS_MODE, /PROFILE,
    /STATISTICS and /DEFAULT_ESCAPE_CHARACTER qualifiers.  PAD will
    accept only CCITT commands and an A command is used to make the
    call.

    If you specify a DTE address, you may use any of the qualifiers.
    The PAD will make the call as requested and then enter CCITT
    mode.