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)端