キーワード: 即時(shí)(shí)通訊___，企業(yè)(yè)(yè)(yè)溝通______________，龍笛即時(shí)(shí)通_________，視頻會(huì)議__________，集成開發(fā)(fā)(fā)(fā)__________，手機(jī)(jī)端