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)(kāi)發(fā)(fā)(fā)(fā)_______，手機(jī)(jī)端