IEEE MultiMedia
The Impact of Confidentiality on Quality of Service in Heterogeneous Voice over IP Networks
MMNS '01 Proceedings of the 4th IFIP/IEEE International Conference on Management of Multimedia Networks and Services: Management of Multimedia on the Internet
QoS-IP '01 Proceedings of the International Workshop on Quality of Service in Multiservice IP Networks
Proposed Architectures for the Integration of H.323 and QoS over IP Networks
ICN '01 Proceedings of the First International Conference on Networking-Part 2
Efficient and stateless deployment of VoIP services
Computer Networks: The International Journal of Computer and Telecommunications Networking
Review: VoIP: State of art for global connectivity-A critical review
Journal of Network and Computer Applications
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The Internet is under rapid growth and continuous evolution in order to accommodate an increasingly large number of applications with diverse service requirements. In particular, Internet telephony, or voice over IP is one of the most promising services currently being deployed. Besides the potentially significant cost reduction, Internet telephony can offer many new features and easier integration with widely adopted Web-based services. Despite these advantages, there still exist a number of barriers to the widespread deployment of Internet telephony. The most prominent one, however, is how to ensure the QoS needed for voice conversation. The purpose of this article is to survey the state-of-the-art technologies in enabling the QoS support for voice communications in the next-generation Internet. In this article, we first review the existing technologies in supporting voice over IP networks, including the basic mechanisms in the IETF Internet telephony architecture and ITU-T H.323-related Recommendations. We then discuss the IETF QoS framework, specifically the Intserv and Diffserv framework. Finally, we present two leading companies' (Cisco and Lucent) solutions to offering IP telephony services as examples to illustrate how real systems are implemented