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 (3GPP TS 22.090 version 4.0.0 Release 4)
standard published 03/01/2001 by European Telecommunications Standards Institute
