VoIP will be one of the biggest application of NGN, and how to upgrade the existing VoIP network QoS level "operator", while maintaining the low cost of IP business, is each telecom operators are thinking and exploring the topic, Shanghai unicom UniOne based unified (business) and MISN comprehensive (metropolitan area network), and other new technology business philosophy, in the NGN softswitch, MPLS/VPN, and based on the further research of relevant technology such as IPv6, after nearly two years of practice, walked out of a raise IP bearing network QoS and apply soft switching technology to implement centralized business is an effective means of management and control,
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