キーワード: 即時(shí)(shí)通訊___________，企業(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)__，手機(jī)(jī)(jī)端