キーワード: 即時(shí)(shí)通訊____，企業(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)_，手機(jī)(jī)(jī)端