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] (Endorsed by AENOR in March of 2004.)
STANDARD published on 1.3.2004
Designation standards: UNE-EN 300356-20V4.3.1
Publication date standards: 1.3.2004
Approximate weight : 300 g (0.66 lbs)
Country: Spanish technical standard
Category: Technical standards UNE