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)議________，集成開(kāi)發(fā)(fā)(fā)(fā)(fā)_________，手機(jī)(jī)(jī)(jī)端