2001-09-06 2023-02-21 Expert Review Jon Peterson itu-t88 ITU-T Q.761-4 (1988) itu-t92+ ITU-T Q.761-4 (1992) ansi88 ANSI T1.113-1988 ("Signaling System Number 7 (SS7) - ISDN User Part") ansi00 ANSI T1.113-2000 etsi121 ETS 300 121 ("Integrated Services Digital Network (ISDN)" Application of the ISDN User Part (ISUP) of CCITT Signalling System No. 7 for international ISDN interconnections (ISUP version 1).) etsi356 ETS 300 356-1 ("Integrated Services Digital Network (ISDN)"; Signalling System No.7; ISDN User Part (ISUP) version 2 for the international interface.) ttc87 JT-Q761-4(1987-1992) ttc93+ JT-Q761-4(1993-) Expert Review Jon Peterson iso ISO/IEC 11572 (Basic Call) (Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Circuit mode bearer services -- Inter-exchange signalling procedures and protocol.) ISO/IEC 11582 (Generic Functional Protocol) (Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Generic functional protocol for the support of supplementary services -- Inter-exchange signalling procedures and protocol.)