キーワード: 即時(shí)(shí)(shí)通訊__，企業(yè)(yè)(yè)溝通_，龍笛即時(shí)(shí)(shí)通_____，視頻會(huì)(huì)(huì)議_，集成開(kāi)(kāi)發(fā)(fā)(fā)_________，手機(jī)(jī)(jī)端