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)議_____________，集成開發(fā)(fā)(fā)(fā)(fā)(fā)_______，手機(jī)(jī)(jī)(jī)端