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)議________，集成開(kāi)發(fā)(fā)(fā)(fā)__，手機(jī)(jī)(jī)端