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