Schlüsselwort: 即時(shí)通訊____________________，企業(yè)(yè)(yè)(yè)(yè)(yè)溝通_________，龍笛即時(shí)通_______________，視頻會(huì)議______，集成開(kāi)發(fā)(fā)(fā)(fā)(fā)(fā)___________，手機(jī)(jī)(jī)端