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ETSI GTS GSM 02.93
M00000435
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ETSI GTS GSM 02.93 Digital cellular telecommunications system (Phase 2+) (GSM); Completion of Calls to Busy Subscriber (CCBS); Service description, Stage 1 (GSM 02.93 version 5.4.0)
standard by European Telecommunications Standards Institute, 11/01/1997
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