Private Integrated Services Network (PISN);Specification, functional model and information flows;Short message service supplementary service [ISO/IEC 21989 (2002) modified] (Endorsed by Asociación Espanola de Normalización in January of 2022.)
NORMA vydaná dňa 1.1.2022
Designation standards: UNE-EN 301990V1.1.1
Publication date standards: 1.1.2022
Approximate weight : 300 g (0.66 lbs)
Country: Spanish technical standard
Kategória: Technické normy UNE