本書是英文版，但內容非常不錯，本書目錄如下：
Table of Contents
SIP—Understanding the Session initiation Protocol, Second Edition
Foreword to the First Edition
Preface to - the Second Edition
Preface to - the First Edition
Chapter 1 - SIP and the Internet
Chapter 2 - Introduction to SIP
Chapter 3 - SIP Clients and Servers
Chapter 4 - SIP Request Messages
Chapter 5 - SIP Response Messages
Chapter 6 - SIP Header Fields
Chapter 7 - Related Protocols
Chapter 8 - Comparison to H.323
Chapter 9 - Wireless and 3GPP
Chapter 10 - Call Flow Examples
Chapter 11 - Future Directions
Appendix A - Changes in the SIP Specification from RFC 2543 to RFC 3261
Convergence between the two largest networks (Telecom and IP) is taking place
very rapidly and at diff erent levels: (1) network level: unifi cation of IP networks
with traditional Telecom networks through evolving standards (Session initiation
Protocol (SIP), Realtime Transfer Protocol (RTP), SS7, 3G) to support interopera-
bility; (2) service level: traditional Telecom services like voice calls are being provi-
sioned on the IP backbone (VoIP), while traditional IP services (most data-driven
services such as multimedia, browsing, chatting, gaming, etc.) are accessible over
the Telecom network.
The dictionary definition of telecommunications is ‘communication over long
distance by cable, telegraph, telephone or broadcasting’, but since its initiation over
100yearsagothingshavemovedrapidly.Telecommunicationsisnowaverycomplex
industrywithmanydifferentpressures,operatinginahighlydynamic environment.It
is best viewed as part of a wider industry known as information and communication
technology (ICT). The purpose of this chapter is to explain where telecommunication
fits in, to highlight some of the complexities – hopefully to simplify them – and to
position the industry in today’s dynamic business environment.
