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