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