キーワード: 即時(shí)(shí)通訊___，企業(yè)(yè)(yè)(yè)溝通_________，龍笛即時(shí)(shí)通___，視頻會(huì)(huì)議____________，集成開(kāi)(kāi)發(fā)(fā)(fā)(fā)___，手機(jī)(jī)(jī)(jī)端