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ETSI TS 101 377-2-4

GEO-Mobile Radio Interface Specifications; Part 2: Service specifications; Sub-part 4: Call Waiting (CW) and Call Hold (HOLD) Supplementary Services - Stage 1; GMR-2 02.083
standard by European Telecommunications Standards Institute, 03/01/2001
Publisher: ETSI

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GMR-2 specification defining the requirements for Call Waiting (CW) and Call Hold (HOLD) supplementary services.

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