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