Palavra chave: 即時(shí)(shí)通訊_，企業(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)_____，手機(jī)(jī)(jī)端