DIN EN 300121:2004-07

Integrated Services Digital Network (ISDN) - Application of the ISDN User Part (ISUP) of ITU-T Signalling System No. 7 (SS7) for international ISDN interconnections (ISUP version 1); Amendment 1: International Emergency Preference Scheme (IEPS) service. (ISDN - Anwendung des ISDN-Anwenderteils (ISUP) des ITU-T-Zeichengabesystems Nr. 7 (SS7) für internationale ISDN-Verbindungen (ISUP Version 1); Änderung 1: Dienst "Internationales Notfall-Vorrangschema (IEPS)".)