Schlüsselwort: 即時(shí)(shí)通訊________，企業(yè)(yè)(yè)(yè)(yè)溝通__________，龍笛即時(shí)(shí)通______，視頻會(huì)(huì)議______________，集成開(kāi)發(fā)(fā)(fā)(fā)(fā)___，手機(jī)(jī)端