Integrated Services Digital Network (ISDN);Signalling System No.7;ISDN User Part (ISUP) version 2 for the international interface;Part 16: Call Hold (HOLD) supplementary service [ITU-T Recommendation Q.733, clause 2 (1993), modified] (Endorsed by Asociación Espanola de Normalización in June of 2022.)
NORMA vydaná dňa 1.6.2022
Designation standards: UNE-ETS 300356-16ED1
Publication date standards: 1.6.2022
Approximate weight : 300 g (0.66 lbs)
Country: Spanish technical standard
Kategória: Technické normy UNE