ETSI EN 300 356-1
ETSI EN 300 356-1
Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 1: Basic services [ITU-T Recommendations Q.761 to Q.764 (1999) modified]
standard published 07/01/2001 by European Telecommunications Standards Institute
