Listed here are Newport Networks' White Papers with brief summaries of the topics. There is an on-line version of each, plus a PDF copy of the papers may be downloaded from the document centre.
The security of SIP-based networks and of Voice over IP in general is ultimately about a complete security architecture, not a single product or protocol. Fixed/Mobile Convergence and IMS have created some widely accepted standards and also highlighted architectural differences in the converging networks. Whilst the overall objective of providing a flexible, secure network and secure services is common, the implementation details differ from network to network.
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Emergency Call Handling (ECH) is an essential feature of today's public telephone networks, and if Voice over IP based PSTN replacement is to become a reality, the new technology will have to deliver reliable handling of emergency calls. The needs of ECH have been extended as a result of recent national emergencies, such as floods and terrorist atrocities. These have focused Governments' attention on the need to secure the lines of communication for key workers and facilities, as well as support for emergency calls..
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Lawful Interception (LI) is a requirement placed upon service providers to provide legally sanctioned official access to private communications. However, Voice over IP (VoIP) technology has enabled the mobility of the end-user, so it is no longer possible to guarantee the interception of calls based on tapping a physical line.
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The United Kingdom is about to become the first market where VoIP interconnection will be introduced and regulated. The VoIP interconnect infrastructure will mimic the capabilities of today's PSTN. This pioneering move in the UK was catalysed by British Telecom's announcement of their 21st Century Network program - the migration of their PSTN network to carry voice and multimedia traffic over an all-IP infrastructure.
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Session border controllers which can be physically separated into signalling and media elements are an essential part of building converged networks based on an IMS architecture. This white paper provides an overview of the different strands of standardisation that are providing the base for converged networks to become a reality and describes some of the key functional elements.
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As Voice over IP (VoIP) emerges as the future of voice communications, questions remain about its quality and security. Put simply, the actual capacity of an IP network to carry voice is poorly defined and not well understood. Congestion, packet loss and delays in an IP network can adversely affect the Quality of Service (QoS) for the subscribers. Therefore, mechanisms to manage bandwidth usage must be utilised to maximise the service quality.
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Carrier Class Voice over IP
With recent technological advances in Voice over IP, the communications industry has at last reached a position of strength. In the past, technology lacked the maturity to deliver a profitable and sustainable VoIP business model, but recent breakthroughs allow carriers to introduce profitable, carrier-class VoIP services.
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Rolling out a public SIP service brings with it several security issues. Both users and Service Providers must understand these issues, but the burden is with the Service Provider to offer a secure and reliable service to the user. This White Paper examines these issues and looks at how the Service Provider can overcome these through the deployment of Session Controllers in the access network and in the core.
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NAT traversal is a challenge that all Service Providers looking to deliver public IP-based voice and multimedia services must solve. The challenge is to provide secure connection to subscribers behind NATs and Firewalls. This White Paper describes the various proposals for solving the Firewall and NAT traversal problems.
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Calculating how much bandwidth a Voice over IP call occupies can feel a bit like trying to answer the question; "How elastic is a piece of string?" However, armed with a basic understanding of the parts that make up the whole, the question becomes easier to understand. This White Paper examines the process that turns voice into Voice over IP. Also see the on-line VoIP Bandwidth Calculator.
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