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)發(fā)(fā)(fā)(fā)__________，手機(jī)(jī)(jī)端