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