In order to support the requirements of voice deployments, next-generation networks must be capable of supporting a service equivalent to the existing public switched telephone network (PSTN), in terms of reliability. Furthermore, these networks must be capable of carrying voice services even under heavy load, while maintaining the integrity of the voice calls, under even the most extreme circumstances.
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The history of telecommunications management is rife with examples of good technology failing to meet business requirements. Historically, while business has needed management of service definitions, technology has focused on element management, leaving a gap between what is desired and what is possible. If operational expenses are to be lowered, this gap must be closed.
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With network operators facing eventual equipment obsolescence in their existing narrowband public switched telephone networks (PSTNs), the Multiservice Switching Forum (MSF) expects that end-to-end voice over Internet protocol (VoIP) solutions will necessarily replace PSTNs in the medium term. What are the primary issues that must be addressed to define a large-scale VoIP network capable of supporting full PSTN equivalence?
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As Internet and IP technologies are increasing service expectations, the number of resources available to create, deploy, and manage new services have reduced. The result is that expectations for new services are outpacing the ability to deliver them. We explore the limitations of traditional voice service architecture, and propose a new architectural solution to address these shortcomings.
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True multi-service, multi-vendor global networks are the future of the telecommunications industry. However, mazes of international standards and protocols can create barriers rather than solutions. For service providers and system suppliers alike, implementing standards for interoperability is far from simple. The MultiService Switching Forum (MSF) fills the void by developing implementation agreements that take standards from theory into practice.
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Widespread acceptance of the principles in the Third Generation Partnership Project (3GPP) IP Multimedia Subsystem (IMS) is nearing a level that would indicate the communications industry is close to reaching a de facto convergence architecture. We look at similarities and differences between the MultiService Forum R2 (physical) architecture and the 3GPP R6 Core IMS functional architecture.
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Bandwidth managers can provide the basis of a large-scale solution for a quality of service (QoS) that can support public switched telephone network (PSTN)-grade services. A key aspect of the solution is the ability to be integrated with multi-protocol label switching (MPLS) traffic engineering capabilities, to provide a highly scalable, resilient, and rigorous solution for end-to-end quality of service.
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End-to-end performance monitoring on signaling and bearer links, and on inter-networking between service and transport provider domains, are the most complicated and necessary areas of a new management networks paradigm. The testability of next-generation networks (NGNs) and their components should thus be addressed in the context of the performance and fault management functional areas of the telecommunication management network (TMN).
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Given the types of overload scenarios encountered within traditional networks, similar traffic principles requiring overload management will be required within (NGNs). What, then, are the characteristics of overload protection within real-time communications servers? And what types of overload management methods are available for optimizing server performance?
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Network-level behaviors can impact the determinism of call admission control decisions for a particular bandwidth management deployment. However, different network routing and forwarding models can have different impacts when used in conjunction with the bandwidth manager. We examine these models, considering their ability to provide the deterministic admission control capabilities available within the public switched telephone network (PSTN).
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