UNE-ETS 300581-2 Ed1:2022 European digital cellular telecommunications system;Half rate speech;Part 2: Half rate speech transcoding (GSM 06.20) (Endorsed by Asociación Española de Normalización in November of 2022.)
2022UNE-ETS 300581-2 Ed2:2022 Digital cellular telecommunications system (Phase 2) (GSM);Half rate speech;Part 2: Half rate speech transcoding (GSM 06.20 version 4.3.1) (Endorsed by Asociación Española de Normalización in November of 2022.)
2022UNE-ETS 300581-2 Ed1:2022 European digital cellular telecommunications system;Half rate speech;Part 2: Half rate speech transcoding (GSM 06.20) (Endorsed by Asociación Española de Normalización in November of 2022.)