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Understanding the Session Initiation Protocol

SIP by Alan Johnston
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This newly revised edition of the ground-breaking Artech House bestseller, SIP: Understanding the Session Initiation Protocol gives you a thorough and up-to-date understanding of this revolutionary protocol for call signaling and IP Telephony. The second edition includes brand new discussions on the use of SIP for wireless multimedia communications. It explains how SIP is powerful “rendezvous” protocol that leverages mobility and presence to allow users to communicate using different devices, modes, and services anywhere they are connected to the Internet You learn why SIP has been chosen by the 3GPP (3rd Generation Partnership Program for wireless cell phones) as the core signaling, presence, and instant messaging protocol.

This cutting-edge book shows you how SIP provides a highly-scalable and cost-effective way to offer new and exciting telecommunication feature sets, helping you design your “next generation” network and develop new applications and software stacks. Other key discussions include SIP as a key component in the Internet multimedia conferencing architecture, request and response messages, devices in a typical network, types of servers, SIP headers, comparisons with existing signaling protocols including H.323, related protocols SDP (Session Description Protocol) and RTP (Real-time Transport Protocol), and the future direction of SIP. Detailed call flow diagrams illustrate how this technology works with other protocols such as H.323 and ISUP. Moreover, the second edition has been updated to cover the new SIP RFC 3261 and the complete set of new SIP extension RFCs.


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 and URIs. Multicast. ABNF Representation.

Introduction to SIP - A Simple Session Establishment Example. SIP Call with Proxy Server. SIP Registration Example. SIP Presence and Instant Message Example. Message Transport.

SIP Clients and Servers - SIP User Agents. Presence Agents. Back to Back User Agents. SIP Gateways. SIP Servers. Acknowledgment of Messages. Reliability. Authentication. S/MIME Encryption. Multicast Support. Firewalls and NAT Interaction. Protocols and Extensions for NAT Traversal.

SIP Request Messages - Methods. URI and URL Schemes used by SIP. Tags. Message Bodies.

SIP Response Messages - Informational. Success. Redirection. Client Error. Server Error. Global Error.

Header Fields - Request and Response Header Fields.Request Header Fields. Response Header Fields. Message Body Header Fields.

Related Protocols - SDP – Session Description Protocol. RTP - Real-time Transport Protocol. RTP Audio Video Profiles. PSTN Protocols. SIP Telephony (SIP-T). Universal Plug and Play Protocol (UPnP).

Comparison to H.323 - Introduction to H.323. Example of H.323. Versions. Comparison. Conclusion.

Wireless and Mobility - IP Mobility. SIP Mobility. 3GPP Architecture and SIP. 3GPP Header Fields. 3GPP SIP Call Flow Example. Future of SIP and Wireless.

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. Call Setup Example with Two Proxies. SIP Presence and Instant Message Example.

Future Directions - SIP, SIPPING, and SIMPLE Working Group Design Teams. Other SIP Work Areas.

SIP Instant Message and Presence Work.

Appendix A: Changes in the SIP Specification from RFC 2543 to RFC 3261.

About the Author.

Alan B. Johnston is a distinguished technical member at MCI and an adjunct assistant professor of electrical engineering at Washington University in St. Louis. 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. He is a co-author of the new SIP specification RFC 3261 and several other SIP-related RFCs.

Artech House; October 2003
307 pages; ISBN 9781580536561
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Title: SIP
Author: Alan Johnston