ETSI EN 300 356-2
ETSI EN 300 356-2
Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 2: ISDN supplementary service [ITU-T Recommendation Q.730 (1999) modified]
standard published 07/01/2001 by European Telecommunications Standards Institute
