ETSI TS 122 090
ETSI TS 122 090
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Unstructured Supplementary Service Data (USSD) - Stage 1 (3G TS 22.090 version 3.0.1 Release 1999)
standard published 01/01/2000 by European Telecommunications Standards Institute
