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ETSI TS 101 377-2-5
- GEO-Mobile Radio Interface Specifications; Part 2: Service specifications; Sub-part 5: Multiparty (MPTY) Supplementary Services; GMR-2 02.084
- standard by European Telecommunications Standards Institute, 03/01/2001
- Publisher: ETSI
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GMR-2 specification defining the requirements for Multiparty (MPTY) supplementary services - Stage 1