キーワード: 即時(shí)(shí)通訊_________，企業(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)____，手機(jī)(jī)端