Quality of service for voice over IP

The paper presents the issues and technologies for delivering voice services over packet switched networks such as IP networks. Specifically the article covers IEEE 802 based LANs (e.g. Ethernet) and IP based networks. The paper starts by looking at quality of service (QoS) from a user perspective. The network factors which affect the QoS are then considered. Layer 2 or LAN issues are then discussed, followed by Layer 3 (IP) networks. Finally a technology roadmap and some conclusions are presented.