キーワード: 即時(shí)(shí)(shí)通訊_____，企業(yè)(yè)(yè)溝通________，龍笛即時(shí)(shí)(shí)通_________，視頻會(huì)(huì)議______，集成開(kāi)發(fā)(fā)(fā)___，手機(jī)(jī)(jī)端