UNE-ETS 300928 Ed1:2023 Digital cellular telecommunications system;Technical realization of supplementary services (GSM 03.11 version 5.0.1) (Endorsed by Asociación Española de Normalización in February of 2023.)
2023UNE-ETS 300928 Ed1:2023 Digital cellular telecommunications system;Technical realization of supplementary services (GSM 03.11 version 5.0.1) (Endorsed by Asociación Española de Normalización in February of 2023.)