McDewey

1 Quality of Service for Voice over IP Quality of Service for Voice over IP Version History Quality of Service for Voice over IP discusses various quality of service (QoS) concepts and features that are applicable to voice—in particular, Voice over IP (VoIP). This document also provides high-level examples showing how to deploy these features in different network environments. Quality of Service for Voice over IP contains the following sections: • QoS for VoIP Overview, page 2 • Sufficient Bandwidth, page 2 • Packet Classification, page 3 • QoS Queueing Mechanisms, page 6 • Fragmentation and Interleaving, page 10 • Traffic Shaping, page 14 • IP RTP Header Compression, page 16 • Differentiated Services for VoIP, page 17 • Resource Reservation Protocol, page 20 • VoIP QoS over Leased Lines (Using PPP), page 32 • VoIP QoS over Frame Relay Networks, page 36 • VoIP QoS over ATM, page 39 • Related Documents, page 42 Version Number Date Notes 1 4/16/2001 This document was created. 2 5/15/2001 Incoporated editorial comments. 3 6/30/2001 Incorporated additional editorial comments.