Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 3 for the international interface; Part 12: Conference Call, add-on (CONF) supplementary service [ITU-T Recommendation Q.734, clause 1 (1993), modified] (Endorsed by AENOR in December of 2004.)
STANDARD published on 1.12.2004
Designation standards: UNE-EN 300356-12V3.1.3
Publication date standards: 1.12.2004
Approximate weight : 300 g (0.66 lbs)
Country: Spanish technical standard
Category: Technical standards UNE