Digital cellular telecommunications system (Phase 2+) (GSM); Mobile radio interface layer 3 supplementary services specification; Formats and coding (GSM 04.80 version 5.2.1)
STANDARD published on 30.10.1998
Designation standards: ETSI ETS 300950-ed.3
Publication date standards: 30.10.1998
The number of pages: 50
Approximate weight : 150 g (0.33 lbs)
Country: European technical standard
Category: Technical standards ETSI