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ETSI TS 101 283
M00001664
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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 6.2.0 Release 1997)
standard by European Telecommunications Standards Institute, 10/01/1998
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