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)(jī)端