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)端