UNE-EN 301850-1V1.1.1

Integrated Services Digital Network (ISDN);Signalling System No.7 (SS7);ISDN User Part (ISUP);Application transport mechanism;Support of the generic addressing and transport protocol;Part 1: Protocol specification [ITU-T Recommendation Q.765.4, modified) (Endorsed by Asociación Espanola de Normalización in December of 2021.)