LRG Networks.com
LWC Training Corp.

Voice over IP Online Course

Lesson 4 - Quality of Service

Introduction

Synopsis

When you pick up a telephone, you expect to converse in a clear and understandable way. The ubiquitous public system telephone network provides this service. A voice over IP system needs to provide the same. Anything less would provide an excuse to avoid the technology. The public Internet is notoriously haphazard. Watching a web page stall as it loads is a fine example of the pitfalls of this complex technology. This chapter examines the techniques that may be applied to a VoIP system that can give the users a true high quality telephone experience.

Lesson Index

A. QoS factors
B. Bandwidth: Share or restrict
C. Providing QoS
D. Packet Level Techniques for Providing QoS
Review and Final Exercise

Lesson Objectives

Upon completion of this section, students will:

• Understand what factors influence QoS and how this affects voice quality.
• Appreciate that two approaches can be taken for QoS: restrict the number of sessions to the available bandwidth or share what bandwidth there is but give priority to services that need it.
• Know some of the techniques used to provide QoS to VoIP. These include 802.1p, ToS, DiffServ, RSVP and MPLS.

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