The 3G IP Multimedia Subsystem (IMS) -- Contents -- Foreword by Stephen Hayes -- Foreword by Allison Mankin and Jon Peterson -- About the Authors -- Preface -- Acknowledgements -- I Introduction to the IMS -- 1 IMS Vision: Where Do We Want to Go? -- 1.1 The Internet -- 1.2 The Cellular World -- 1.3 Why Do We Need the IMS? -- 1.4 Relation between IMS and non-IMS Services -- 2 The History of the IMS Standardization -- 2.1 Relations between IMS-related Standardization Bodies -- 2.2 Internet Engineering Task Force (IETF) -- 2.2.1 Structure of IETF -- 2.2.2 Working Group Operations -- 2.2.3 Types of RFCs -- 2.3 Third Generation Partnership Project (3GPP) -- 2.3.1 3GPP Structure -- 2.3.2 3GPP Deliverables -- 2.4 Third Generation Partnership Project 2 (3GPP2) -- 2.4.1 3GPP2 Structure -- 2.4.2 3GPP2 Deliverables -- 2.5 IETF-3GPP/3GPP2 Collaboration -- 2.5.1 Internet Area -- 2.5.2 Operations and Management Area -- 2.5.3 Transport Area -- 3 General Principles of the IMS Architecture -- 3.1 From Circuit-switched to Packet-switched -- 3.1.1 GSM Circuit-switched -- 3.1.2 GSM Packet-switched -- 3.2 IMS Requirements -- 3.2.1 IP Multimedia Sessions -- 3.2.2 QoS -- 3.2.3 Interworking -- 3.2.4 Roaming -- 3.2.5 Service Control -- 3.2.6 Rapid Service Creation -- 3.2.7 Multiple Access -- 3.3 Overview of Protocols Used in the IMS -- 3.3.1 Session Control Protocol -- 3.3.2 The AAA Protocol -- 3.3.3 Other Protocols -- 3.4 Overview of IMS Architecture -- 3.4.1 The Databases: the HSS and the SLF -- 3.4.2 The CSCF -- 3.4.3 The AS -- 3.4.4 The MRF -- 3.4.5 The BGCF -- 3.4.6 The PSTN/CS Gateway -- 3.4.7 Home and Visited Networks -- 3.5 Identification in the IMS -- 3.5.1 Public User Identities -- 3.5.2 Private User Identities -- 3.5.3 The Relation between Public and Private User Identities -- 3.5.4 Public Service Identities -- 3.6 SIM, USIM, and ISIM in 3GPP -- 3.6.1 SIM.

3.6.2 USIM -- 3.6.3 ISIM -- II The Signaling Plane in the IMS -- 4 Session Control on the Internet -- 4.1 SIP Functionality -- 4.1.1 Session Descriptions and SDP -- 4.1.2 The Offer/Answer Model -- 4.1.3 SIP and SIPS URIs -- 4.1.4 User Location -- 4.2 SIP Entities -- 4.2.1 Forking Proxies -- 4.2.2 Redirect Servers -- 4.3 Message Format -- 4.4 The Start Line in SIP Responses: the Status Line -- 4.5 The Start Line in SIP Requests: the Request Line -- 4.6 Header Fields -- 4.7 Message Body -- 4.8 SIP Transactions -- 4.9 Message Flow for Session Establishment -- 4.10 SIP Dialogs -- 4.10.1 Record-Route, Route, and Contact Header Fields -- 4.11 Extending SIP -- 4.11.1 New Methods -- 4.12 Caller Preferences and User Agent Capabilities -- 4.13 Reliability of Provisional Responses -- 4.14 Preconditions -- 4.15 Event Notification -- 4.15.1 High Notification Rates -- 4.16 Signaling Compression -- 4.16.1 SigComp Extended Operations -- 4.16.2 Static SIP/SDP Dictionary -- 4.17 Content Indirection -- 4.18 URI Lists -- 5 Session Control in the IMS -- 5.1 Prerequisites for Operation in the IMS -- 5.2 IP Connectivity Access Network -- 5.3 P-CSCF Discovery -- 5.4 IMS-level Registration -- 5.4.1 IMS Registration with an ISIM -- 5.4.2 IMS registration with a USIM -- 5.5 Subscription to the reg Event State -- 5.6 Basic Session Setup -- 5.7 Application Servers: Providing Services to Users -- 5.7.1 Generalities About Application Servers -- 5.7.2 Types of Application Servers -- 5.7.3 The Session Setup Model through Application Servers -- 5.7.4 Filter Criteria -- 5.7.5 An Example of Service Execution -- 5.8 Interworking -- 5.8.1 SIP-PSTN Interworking -- 5.8.2 Interworking with Non-IMS SIP-based Networks -- 5.9 Emergency Sessions -- 6 AAA on the Internet -- 6.1 Authentication, Authorization, and Accounting -- 6.2 AAA Framework on the Internet -- 6.3 The Diameter Protocol.

6.3.1 Diameter Sessions -- 6.3.2 The Format of a Diameter Message -- 6.3.3 Attribute Value Pairs -- 6.3.4 The AAA and AAAS URIs -- 6.3.5 Diameter Base Protocol Commands -- 6.3.6 Diameter Base Protocol AVPs -- 7 AAA in the IMS -- 7.1 Authentication and Authorization in the IMS -- 7.2 The Cx and Dx Interfaces -- 7.2.1 Command Codes Defined in the Diameter Application for the Cx Interface -- 7.2.2 AVPs Defined in the Diameter Application for the Cx Interface -- 7.2.3 The User Profile -- 7.3 The Sh Interface -- 7.3.1 Command Codes Defined in the Diameter Application for the Sh interface -- 7.3.2 AVPs Defined in the Diameter Application for the Sh Interface -- 7.4 Accounting -- 7.5 Charging Architecture -- 7.6 Offline Charging -- 7.6.1 IMS Terminal in a Visited Network -- 7.6.2 IMS Terminal in Its Home Network -- 7.6.3 The Rf Interface -- 7.7 Online Charging -- 7.7.1 S-CSCF -- 7.7.2 Application Servers and the MRFC -- 8 Security on the Internet -- 8.1 HTTP Digest -- 8.1.1 Security Properties of Digest -- 8.2 Certificates -- 8.3 TLS -- 8.3.1 SIP Usage -- 8.4 S/MIME -- 8.4.1 Self-signed Certificates -- 8.5 Authenticated Identity Body -- 8.6 IPsec -- 8.6.1 ESP and AH -- 8.6.2 Tunnel and Transport Modes -- 8.6.3 Internet Key Exchange -- 8.7 Privacy -- 8.8 Encrypting Media Streams -- 8.8.1 MIKEY -- 9 Security in the IMS -- 9.1 Access Security -- 9.1.1 Authentication and Authorization -- 9.1.2 Authentication and Authorization with ISIM -- 9.1.3 Authentication and Authorization with USIM -- 9.1.4 Security Association Establishment -- 9.2 Network Security -- 10 Policy on the Internet -- 10.1 The COPS Protocol -- 10.2 The Outsourcing Model -- 10.3 The Configuration Model -- 11 Policy in the IMS -- 11.1 SIP Procedures -- 11.2 Media Authorization -- 11.2.1 The Policy Decision Function -- 11.2.2 Media Authorization Token -- 11.3 Proxy Access to SDP Bodies.

11.4 Initialization Procedure -- 12 Quality of Service on the Internet -- 12.1 Integrated Services -- 12.1.1 RSVP -- 12.1.2 State in the Network -- 12.2 Differentiated Services -- 13 Quality of Service in the IMS -- 13.1 Instructions to Perform Resource Reservations -- 13.1.1 Proxy Modifying Bodies -- 13.2 Reservations by the Terminals -- 13.3 Network Authorization -- 13.4 QoS in the Network -- III The Media Plane in the IMS -- 14 Media Encoding -- 14.1 Speech Encoding -- 14.1.1 Pulse Code Modulation -- 14.1.2 Linear Prediction -- 14.1.3 GSM-FR -- 14.1.4 AMR -- 14.1.5 AMR-WB -- 14.1.6 SMV -- 14.2 Video Encoding -- 14.2.1 Common Video Codecs -- 14.2.2 H.263 -- 14.2.3 Image Encoding -- 14.2.4 Temporal Correlation -- 14.2.5 Spatial Correlation -- 14.3 Text Encoding -- 14.4 Mandatory Codecs in the IMS -- 15 Media Transport -- 15.1 Reliable Media Transport -- 15.2 Unreliable Media Transport -- 15.2.1 DCCP -- 15.2.2 RTP -- 15.2.3 RTCP -- 15.2.4 SRTP -- 15.3 Media Transport in the IMS -- IV Building Services with the IMS -- 16 The Presence Service on the Internet -- 16.1 Overview of the Presence Service -- 16.2 Presence Information Data Format -- 16.3 Rich Presence Information Data Format -- 16.4 Contact Information in Presence Information Data Format -- 16.5 Timed Presence Extension to the PIDF -- 16.6 Presence Capabilities -- 16.7 Presence Publication -- 16.8 Presence Subscription and Notification -- 16.9 Watcher Information -- 16.10 SIP Exploders and Resource Lists -- 16.11 XML Configuration Access Protocol -- 16.11.1 XCAP Application Usage -- 16.12 Presence Optimizations -- 16.12.1 Partial Notification of Presence Information -- 16.12.2 Event Notification Filtering -- 17 The Presence Service in the IMS -- 17.1 The Foundation of Services -- 17.2 Presence Architecture in the IMS -- 17.3 Watcher Subscription -- 17.4 Subscription to Watcher Information.

17.5 Presence Publication -- 17.6 Presence Optimizations -- 17.7 The Ut Interface -- 18 Instant Messaging on the Internet -- 18.1 Modes of Instant Messages -- 18.2 Pager-mode Instant Messaging -- 18.2.1 Congestion Control with MESSAGE -- 18.3 Session-based Instant Messaging -- 18.3.1 The MSRP and MSRPS URLs -- 18.3.2 A Closer Look at MSRP -- 19 The Instant Messaging Service in the IMS -- 19.1 Pager-mode Instant Messaging in the IMS -- 19.2 Session-based Instant Messaging in the IMS -- 20 Push-To-Talk -- 20.1 Push-To-Talk Standardization -- 20.2 Architecture -- 20.3 Interoperator Sessions -- A The 3GPP2 IMS -- A.1 An Introduction to 3GPP2 -- A.2 The Multimedia Domain (MMD) -- A.3 Architecture of the 3GPP2 IMS -- B List of IMS-related Specifications -- B.1 Introduction -- B.2 3GPP Specifications -- B.3 3GPP2 Specifications -- Bibliography -- Index.