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)議_____________，集成開(kāi)發(fā)(fā)(fā)(fā)_，手機(jī)(jī)(jī)端