Voice over IP services offer important revenue-generating opportunities, as well as many technical challenges in providing high-quality services. Users have come to expect highly available telecommunications services with high-quality voice. Service providers need reliable high-performance networks to meet user expectations, and must be able to guarantee performance and reliability to their customers. In converged voice and data networks, the network infrastructure must deliver very high quality and availability for some customer needs, while also providing low-cost high-capacity bandwidth for other needs. The use of quality of service mechanisms to provide prioritization for various traffic types is a key element needed for voice and data network convergence. However, it is not sufficient if the underlying networks are unreliable. The focus of this article is to address the reliability aspects of VoIP services, including the underlying IP networks.
[1]
M. Vogt,et al.
Availability modeling of services in IP networks
,
2003,
Fourth International Workshop on Design of Reliable Communication Networks, 2003. (DRCN 2003). Proceedings..
[2]
J.S. Richters,et al.
A framework for defining the quality of communications services
,
1988,
IEEE Communications Magazine.
[3]
C. M. Hamilton,et al.
Telecommunication-network dependability: a baseline on local-exchange network availability
,
1991,
Annual Reliability and Maintainability Symposium. 1991 Proceedings.