ITU-T E.333-1988 Man-Machine Interface - Telephone Network and ISDN - Operation, Numbering, Routing and Mobile Service (Study Group II) 1 pp Same as Recmn Z.323
that, where a terminal supports “higher level” i) procedures and has the same function keys used for
lower-level procedures in other terminals, then these lower-level procedures should still be operable, to achieve the functionality reached by higher-lev
ITU-T E.333-1988 history
1988ITU-T E.333-1988 Man-Machine Interface - Telephone Network and ISDN - Operation, Numbering, Routing and Mobile Service (Study Group II) 1 pp Same as Recmn Z.323