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)端