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