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)發(fā)(fā)(fā)(fā)_，手機(jī)(jī)端