本书是英文版，但内容非常不错，本书目录如下： 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
