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