UNE-EN 301848-1V1.1.1

Integrated Services Digital Network (ISDN);Signalling System No.7 (SS7);Bearer Independent Call Control (BICC);Signalling procedures in an ATM/IP/.. backbone network;Capability Set 1 (CS1);Part 1: Protocol specification [ITU-T Recommendations Q.1901 and Q.765.5, modified] (Endorsed by Asociación Espanola de Normalización in December of 2021.)