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ETSI TS 101 377-4-11
M00000485
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ETSI TS 101 377-4-11 GEO-Mobile Radio Interface Specifications; Part 4: Radio interface protocol specifications; Sub-part 11: Call Waiting (CW) and Call Holding (HOLD) Supplementary Services; GMR-2 04.083
standard by European Telecommunications Standards Institute, 03/01/2001
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