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ETSI TS 101 283
M00001227
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ETSI TS 101 283 Digital cellular telecommunications system (Phase 2+) (GSM); Technical realization of Completion of Calls to Busy Subscriber (CCBS); Stage 2 (GSM 03.93 version 7.0.0 Release 1998)
standard by European Telecommunications Standards Institute, 08/01/1999
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