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)端