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)(huì)議_________，集成開(kāi)發(fā)(fā)(fā)(fā)(fā)________，手機(jī)(jī)端