キーワード: 即時(shí)通訊_，企業(yè)(yè)(yè)(yè)溝通____，龍笛即時(shí)通_______，視頻會(huì)議_______________，集成開(kāi)發(fā)(fā)(fā)(fā)_______________，手機(jī)(jī)(jī)端