キーワード: 即時(shí)通訊__________，企業(yè)(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)(fā)__，手機(jī)(jī)端