• ETSI TS 100 549
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ETSI TS 100 549

  • Digital cellular telecommunications system (Phase 2+) (GSM); Unstructured Supplementary Service Data (USSD) - Stage 2 (GSM 03.90 version 7.0.0 release 1998)
  • standard by European Telecommunications Standards Institute, 08/01/1999
  • Publisher: ETSI

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