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Deployment of new converged voice, video and data services, is spurring the rapid growth of the cost effective Next Generation Network (NGN). Routing, Numbering and Interconnection are the key concerns in NGN implementation. A Next Generation VoIP Network must provide the capability to route the calls anywhere. This is achieved by having a well defined number plan both nationally and internationally and building the Routing tables using this numbering plan to provide end-to-end connectivity. With the commencement of NGN, the need for IP inter connect to other types of networks becomes vital. There is also a need of transcoders and signaling gateways to ensure compatibility with a variety of network types. This paper describes the issues of routing of calls among multi-operators in NGN. It addresses the issues such as multi-vendor interoperability, QoS and security to accelerate the deployment of NGN. Telecommunication sector is moving towards Next Generation VoIP Networks and this helps service providers in various ways including deployment of new converged voice and data services and removing the need to manage separate voice and data services. NGN provides the capability to route the call anywhere by following the various routing methods including Number translation / routing, Routing table management, Route selection and QoS resource management. By further addressing the issues of QoS and Security, a solution is provided for PSTN equivalent end-to-end connectivity across multi-vendor NGN network.
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