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(kāi)發(fā)(fā)(fā)(fā)(fā)(fā)______，金笛短信