Developer's Handbook

Transcription

1 IMS Application Developer's Handbook Creating and Deploying Innovative IMS Applications Rogier Noldus Ulf Olsson Catherine Mulligan loannis Fikouras Anders Ryde Mats Stifle AMSTERDAM BOSTON HEIDELBERG LONDON NEW YORK OXFORD PARIS SAN DIEGO SAN FRANCISCO SINGAPORE SYDNEY TOKYO Academic Press is an imprint of Elsevier

2 Contents Foreword Preface Acknowledgements About the Authors X1 xiii xyi xvii CHAPTER 1 Introduction Why Was IMS Developed? Observations Network Vision: Enable and Simplify Billions of Mobile Handsets The MultiTalented Mobile Handset Extending Existing Behavior VoiceOver IP Over Broadband The Mobile Phone, Boosted IMS Architecture for Those That Don't Need to Know Services The Home Network Concept The Residential Opportunity The Enterprise Opportunity Setting the Scene: The Story So Far IMS VoIP on Existing IP Networks Rich Communication Suite (RCS) PushtoTalk Doing Useful Work: The Service Story The Communication Service Layer IMS and Web The Concept Applied Multimedia Telephony Multimedia Telephony. What Is It? Why MMTel What are the Driving Requirements? Multimedia Telephony: The Origins Summary 26 CHAPTER 2 Business Modeling for a Digital Planet Introduction Basic Economic Concepts for Developers Economies of Scale Transaction Costs Open APIs and Transaction Costs Factors of Production 32 iii

3 a iv Contents Capital Goods Software Consumer Goods Software Value Creation and Capture in Modem Communications Industries The Role of the Individual in a Digital World The Mobile Broadband Platform The Business Case for IMS Global Interoperable Standards Developer's View Regulation and the Right to Private Communications Business Models for a Digital Planet Toward a Diagramming Technique Practical Examples Application to IMS Conclusions 48 CHAPTER 3 Service Deployment Patterns Introduction Back to Basics ClientSide Application ServerSide EndPoint Application Web ServerSide EndPoint Application Web ClientSide EndPoint Application MidPoint Application ClientSide Application, Building on a Standardized Service ToDoList Summary 58 CHAPTER 4 Applications in the IP Multimedia Subsystem Introduction IMS Service Creation Service Composition Composition Through Chaining IMS Service Chaining Architecture IMS Service Composition Initial Filter Criteria TwoTier Composition and the Service Capability Interaction Manager Unified Web Services and IMS Composition NextGeneration Intelligent Networks and Migration to IMS IMS Application Servers The Converged SIP Servlet Container SIP Application Types SIP Application Composition in JSR Conclusions 80

4 Contents v CHAPTER 5 Service Development Virtual Call Center UseCase UseCase Architecture UseCase Business Logic Constituent SIP Applications WebBased DoNotDisturb UseCase UseCase Architecture Constituent Components UseCase Business Logic AJAX/S1P Interaction Conclusions 104 CHAPTER 6 Introduction to IPBased RealTime Communications Introduction Basics of Voice Over IP Digital Speech Transmission OSI Reference Model Data Transmission Using the Realtime Transport Protocol Ill Realtime Transport Control Protocol Control Plane Versus User Plane MultiParty Communication Session Registration Initial Registration and Call Establishment Deregistration Reregistration Mobility Versus Nomadicity Locating the Registrar Regi stration Relationships Subscriber Administered in VoIP Network, but Currently not Registered Subscriber Administered in VoIP Network and Currently Registered Network Domains 142 CHAPTER 7 Introduction to Session Initiation Protocol Introduction The SIP Standard SIP Session Versus Media Session SIP Transaction Model Command Sequence SIP Transaction State Models Proxy Roles Stateless Proxy 158

5 vi Contents Stateful Proxy BacktoBack User Agent SIP Session Establishment Request Message Response Message Initial Request Message Routing Response Message Routing Building an SIP Routing Path for Subsequent SIP Requests Exchanging Contact Addresses for Subsequent SIP Requests Subsequent Request Message Routing SIP Transport Considerations Internal DNS Versus External DNS Reliability of SIP Requests and SIP Responses Canceling a SIP Transaction Request SIP Dialogs Multiple Early Dialogs Target Set Early Media Media Transmission: OfferAnswer Model L.1 A Closer Look at the SDP Structure Some SDP Examples 219 CHAPTER 8 Introduction to the IMS Network Introduction Overview of IMS Standards and Releases IMS Network Architecture A Global View IMS Core Network IMS Access Network IMS Network Architecture A Closer Look Core Network Entities Network Border Gateway Nodes Registration Registration Relationships Periodic ReRegistration and DeRegistration Implicit Registration Set Thirdparty Registration Applicationinitiated Registration Session Establishment Media Gating Using Phone Numbers Number Normalization ENUM Query 288

6 Contents vii Public ENUM versus Carrier ENUM Phone Number Representation Through SIP URI Application Servers in IMS Introduction and Concept The ISC Reference Point Service Chaining SIPAS as Proxy, B2BUA, UAC, or UAS Public Services Serviceinitiated Session Establishment User Interaction Unregistered Service Invocation Messaging in IMS Instant Message Messaging Session 328 CHAPTER 9 MMTel and Other IMS Enablers Introduction A More InDepth Look into MMTel Basic MMTel Architecture Going Deeper and Wider Adding to MMTel ISC Chaining Northbound Interface Forwarding to Extension Logic Web Interfaces on the Client Side UseCase: CalendarBased Routing IMS Presence Presence as Defined by OMA Interacting with the Presence System The Presentity Data Model XDM Data Management Finding the right devices Conclusion 349 CHAPTER 10 Charging Introduction Obvious and Not So Obvious Ways of Getting Paid Money Makes the App Go Around Selling to the Enduser Through a Store Selling Over and Over Again Payperuse Advertising 354

7 Connecting viii Contents Letting Someone Else do the Heavy Lifting Sell Something Else Count on your Fellow Man Benefit in an Entirely Different Dimension The Mechanics of Charging Offline Charging Online Charging Summary 362 CHAPTER 11 Interworking with Legacy Networks Introduction The Bigger Picture IMS to the Outside World Interworking Through MGCF and IMMGW General Protocol Mapping MGCF SIP Signaling Capability Userplane Interworking Video Interworking Supplementary Service Interworking Calling Line Presentation and Calling Line Presentation Restriction Connected Line Presentation and Connected Line Presentation Restriction Call Hold and Resume Call Forwarding Applying Legacy VAS in the IMS Network The Starting Point: VAS in the CS Network and VAS in the IMS Network The Challenge: Safeguarding Legacy VAS Investment Service Capability Interaction Manager 399 CHAPTER 12 Rich Communication Suite Introduction The Basics of RCS What is RCS? Why RCS? Overview of RCS Release Functionality RCS Release Enriched Call Enhanced Messaging Enriched Phone Book RCS Release Broadband Access MultiDevice Environment 419

8 MultiDevice Contents ix Enriched Call Network Address Book RCS Provisioning 12.6 RCS Release RCS Release RCSe Capability Discovery in RCSe Using RCS Applications to Capture Value Conclusions 4?0 CHAPTER 13 Evolved IP Multimedia Architecture and Services Introduction 43' 13.2 Overview of the Evolved IMS Architecture GSMA VoLTE 420 IMS Profile for Voice and SMS VoLTE Considerations for Service Designers Single Radio Voice Call Continuity (SRVCC) SRVCC Architecture in 3GPP Release SRVCC HighLevel Usecase Explained SRVCC Architecture in 3GPP Release IMS Centralized Services (ICS) ICS Solution with Evolved MSC ICS Solution Using Existing ISUP/Mg and CAMEL Terminating Access Domain Selection (TADS) SRVCC and ICS Considerations for Service Designers 445 CHAPTER 14 Future Outlook: Market and Technology What is Next in Store for IMS? TV Smart Pipes Home Networks Web Clients Machine to Machine (M2M) Vehicle Automation WAC and Other App Stores Secure, NonAnonymous Coinms: The Alternative Network Conclusion 451 References 453 Abbreviations 455 Index 463