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ETSI TS 101 377-4-12
M00000484
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ETSI TS 101 377-4-12 GEO-Mobile Radio Interface Specifications; Part 4: Radio interface protocol specifications; Sub-part 12: Multiparty Supplementary Services (MPTY); GMR-2 04.084
standard by European Telecommunications Standards Institute, 03/01/2001
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