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)(jī)端