随着通信技术的进步和人们对通信需求的不断增加，能够提供集话音、图像、数据为一体的多媒体综合业务的开放的下一代网络（Ｎｅｘｔ Ｇｅｎａｒａｔｉｏｎ Ｎｅｔｗｏｒｋ，ＮＧＮ）体系结构逐步显现，成为电信网络发展的热点。 ＮＧＮ体系采用开放的网络构架，将传统交换机的 With the advancement of communication technology and the ever increasing demand for communication, the open Next Generation Network (NGN) architecture capable of providing multimedia integrated services integrating voice, video, and data into a whole has gradually emerged as a telecommunications network The development of hot spots. The NGN architecture uses an open network architecture that will traditional switchboards