ETSI EN 300 356-20
- Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 20: Completion of Calls on No Reply (CCNR) supplementary service [ITU-T Recommendation Q.733, clause 5 (1999) m
- standard by European Telecommunications Standards Institute, 07/01/2001
- Publisher: ETSI
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