Integrated Services Digital Network (ISDN) - Signalling System No. 7 - ISDN User Part (ISUP) version 3 interactions with the Intelligent Network Application Part (INAP) - Part 1: Protocol specification (ITU-T Recommendation Q.1600 (1997), modified) (Endorsement of the English version EN 301070-1 V 1.2.2 (1998-09) as German standard)