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ETSI TS 101 284
M00000083
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ETSI TS 101 284 Digital cellular telecommunications system (Phase 2+) (GSM); Completion of Calls to Busy Subscriber (CCBS); Stage 3 (GSM 04.93 version 6.1.0 Release 1997)
standard by European Telecommunications Standards Institute, 07/01/1998
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