(The traditional fixed network and mobile network are two separate networks with different system architectures. NGN will be a wired and wireless network, and the mobile network will exist as an access network of NGN. Therefore, the softswitch technology provided by various services is the foundation of NGN network development, and the core of the softswitch technology is the open network of control, bearer and service. According to the technical structure of softswitch, the NGN network can be divided into four functionally)
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