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