DIN EN 300392-12-12:2004-08
Действует
Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 12: Supplementary services stage 3 - Sub-part 12: Call Hold (HOLD) (Endorsement of the English version EN 300392-12-12 V1.1.2 (2003-05) as German standard)
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