In recent years , some new recommendations were proposed by the ITU , such as the T120 and T130 serial , which defined the model and structure of the multimedia communication system .
近年来，国际电信联盟针对这方面的应用制定了ITUT120和ITUT130系列建议和草案，提出了多点多媒体通信系统的模型和结构。
t120