ETSI EN 300 356-19
- Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 19: Three-Party (3PTY) supplementary service [ITU-T Recommendation Q.734, clause 2 (1996) and implementors guid
- standard by European Telecommunications Standards Institute, 07/01/2001
- Publisher: ETSI
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