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Alan B. Johnston is an advisory engineer at WorldCom and an adjunct at Washington University. He holds a B.E.(Hons) in electrical and electronic engineering from the University of Melbourne, Australia and a Ph.D. in electrical engineering from Lehigh University.

Forward. Preface. SIP and the Internet - Signaling Protocols. The Internet Engineering Task Force. A Brief History of SIP. Internet Multimedia Protocol Stack. Utility Applications. DNS and IP Addresses. URLs. Multicast. ABNF Representation. Introduction to SIP - A Simple SIP Example. SIP Call with Proxy Server. SIP Registration Example. Message Transport. SIP Clients and Servers - SIP User Agents. SIP Gateways. SIP Servers. Acknowledgment of Messages. Reliability. Authentication, Encryption, Multicast Support, Firewalls and NAT Interaction. SIP Request Messages - Methods. SIP URLs and URIs. Tags. Message Bodies. SIP Response Messages - Informational. Success 200 OK. Redirection. Client Error. Server Error. Global Error. SIP Headers - General Headers. Request Headers. Response Headers. Entity Headers. Related Protocols - SDP-Session Description Protocol. RTP-Real-time Transport Protocol. RTP Audio Video Profiles. PSTN Protocols. Comparison to H.323 - Introduction to H.323. Example of H.323. Versions. Comparison. Comparison Summary. Call Flow Examples - SIP Call with Authentication, Proxies, and Record-Route. SIP Call with Stateless and Stateful Proxies with Called Party Busy. SIP to PSTN Call Through Gateway. PSTN to SIP Call Through Gateway. Parallel Search. H.323 to SIP Call. Future Directions - Changes to RFC 2543. SIP Working Group Design Teams. Other Related Drafts. About the Author. Index.