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