SS-ETS-300549 › Digital cellular telecommunications system (Phase2) - Unstructured Supplementary Service Data (USSD) - Stage 2 (GSM 03.90)
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Digital cellular telecommunications system (Phase2) - Unstructured Supplementary Service Data (USSD) - Stage 2 (GSM 03.90)
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33.020 (Telecommunications in general Including infrastructure)
Designation Name
SS-ETS 300549
Revision Level
EDITION 2
Status
Current
Publication Date
Sept. 6, 1996
Language(s)
English
International Equivalent
ETS 300549:1996 IDT