Chapter 1. Introduction

There is a growing interest, both in the Internet and in the telecommunication industries, in multimedia communication services. An increasing number of Internet users who used to just surf the web or send emails are now becoming addicted to services such as Instant Messaging (IM), online gaming, and voice and video on the Net. These are examples of multimedia communication services delivered over the Internet that are enabled by the Session Initiation Protocol (SIP) in conjunction with other protocols.

In this first introductory chapter, we will explain what we mean by multimedia communication services. We will position these services in the context of the rest of the applications provided over the Internet.

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