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) modified]
STANDARD published on 18.7.2001
Designation standards: ETSI EN 300356-20-V4.3.1
Publication date standards: 18.7.2001
The number of pages: 18
Approximate weight : 54 g (0.12 lbs)
Country: European technical standard
Category: Technical standards ETSI