The IMS: IP Multimedia Concepts and Services, 2/e

Description

The IMS: IP Multimedia Concepts and Services, Second Editionbuilds on the success of the previous best-selling edition, providing comprehensive coverage of IMS – its concepts, architecture, protocols and functionalities with a wealth of new and updated material. Mobile telephony with the current technology has been hugely successful and demonstrates the immense value of communicating with peers while being mobile, and with increasingly available smarter multimedia terminals, the communication experience will be something more than just exchanging voice. These multimedia terminals need IP multimedia networks. Hence the Third Generation Partnership Project (3GPP) has developed a standard for SIP-based IP multimedia service machinery known as ‘The IMS’ (IP Multimedia Subsystem). This completely up-to-date and informative guide explains everything you need to know about it.…

Key features of the Second Edition include:

• Two new chapters on push-to-talk over cellular and group management
• Additional new material includes: fixed and mobile convergence, interworking between IPv4 and IPv6 in the IMS, combined circuit-switched and IMS services (combinational services), IMS security and alternative session establishment procedures
• More coverage of the benefits of IMS, particularly with regard to its role in fixed-mobile convergence
• Special emphasis on services, featuring more detailed descriptions of presence, messaging, group management and push-to-talk over cellular (conferencing)
• Updates on Third Generation Partnership Project Agreement (3GPP) Release 6 level
• New examples and case studies, including a variety of scenarios, how to handle multiple terminals and end-user preferences

Written in a manner that allows readers to choose the level of knowledge and understanding they need to gain about the IMS, this volume will have instant appeal to a wide-ranging audience including marketing managers, research and development engineers, network engineers, developers, test engineers and university students.

Table of Contents

Foreword.

Preface.

List of Figures.

List of Tables.

1   Introduction.

1.1  What is Internet Protocol Multimedia Subsystem (IMS).

1.2  Example of IMS services.

1.3  Where did it come from?  

2   IP Multimedia Subsystem Architecture.

2.1  Architectural requirements.

2.2  Description of IMS-related entities and functionalities.

2.3  IMS reference points.

3   IMS Concepts.

3.1  Overview.

3.2  Registration.

3.3  Mechanism to register multiple user identities at once.

3.4  Session initiation.

3.5  Identification.

3.6  Identity modules.

3.7  Sharing a single user identity between multiple devices.

3.8  Discovering the IMS entry point            .

3.9  S-CSCF assignment.

3.10  Mechanism for controlling bearer traffic.

3.11  Charging            .

3.12  User profile.

3.13  Service provision.

3.14  Connectivity between traditional circuit-switched users and IMS' users.

3.15  Fixed and mobile convergence.

3.16  SIP compression.

3.17  Interworking Between IPv4 and IPv6 in the IMS.

3.18  Combination of Circuit Switched and IMS Services - Combinational Services.

3.19  Security services in the IMS.

4   Presence.

4.1  Who will use the presence service?           

4.2  Presence Enhanced Services.

4.3  Presence contributing to business.

4.4  What is presence?

4.5  SIP for presence.

4.6  Presence service architecture in IMS.

4.7  Presented list.

4.8  Setting presence authorization.

4.9  Publishing presence.

4.10  Watcher information event template package.

4.11  Example signalling flows of presence service operation.

5   Messaging.

5.1  Overview of IMS messaging.

5.2  IMS messaging architecture.

5.3  Immediate messaging.

5.4  Session-based messaging            .

5.5  Deferred delivery messaging.

6   Push to talk over cellular.

6.1  PoC architecture.

6.2  PoC features.

6.3  User Plane.

6.4  PoC service settings.

7   Conferencing.

7.1  Conferencing architecture.

7.2  SIP event package for conference state.

7.3  Example signalling flows of conferencing service operation.

8   Group Management.

8.1  Group Management contributing to business.

8.2  What is Group Management?  

8.3  Resource list.

8.4  XCAP usage for resource lists.

8.5  PoC XML Document Management (XMD) Specification.

8.6  PoC XDM Application usages.

9   Introduction to Detailed Procedures.

9.1  The example scenario.

9.2  Base standards.

10   An example IMS registration.

10.1  Overview.

10.2  Signalling PDP context establishment.

10.3  P-CSCF discovery.

10.4  Transport protocols.

10.5  SIP registration and registration routing aspects.

10.6  Authentication.

10.7  Access security---IPsec Sas.

10.8  SIP Security Mechanism Agreement.

10.9  Compression negotiation.

10.10  Access and location information.

10.11  Charging-related information during registration.

10.12  User identities.

10.13  Re-registration and re-authentication.

10.14  De-registration            .

10.15  Early IMS Secuirty.

11  An example IMS Session.

11.1  Overview.

11.2  Caller and callee identities.

11.3  Routing.

11.4  Compression negotiation.

11.5  Media negotiation.

11.6  Resource reservation.

11.7  Controlling the media.

11.8  Charging-related information for sessions.

11.9  Release of a session.

11.10  Alternative Session Establishment procedures.

11.11  Routing of PSIs.

12   SIP.

12.1  Background.

12.2  Design principles.

12.3  SIP architecture.

12.4  Message format.

12.5  The SIP URI.

12.6  The tel URI.

12.7  SIP structure.

12.8  Registration.

12.9  Dialogs.

12.10  Sessions.

12.11  Security.

12.12  Routing requests and responses.

12.13  SIP extensions.

13   SDP.

13.1  SDP message contents            409

13.2  SDP message format            411

13.3  Selected SDP lines            411

14   The Offer/Answer Model with SDP.

14.1  The offer            .

14.2  The answer.

14.3  Offer/answer processing.

15   RTP.

15.1  RTP for real-time data delivery.

15.2  RTCP.

15.3  RTP profile and payload format specifications.

15.4  RTP profile and payload format specification for audio and video (RTP/AVP).

16   DNS.

16.1  DNS resource records.

16.2  The naming authority pointer (NAPTR) DNS RR.

16.3  ENUM---the E.164 to URI Dynamic Delegation Discovery System (DDDS) application.

16.4  Service records (SRVs).

17   GPRS.

17.1  Overview.

17.2  Packet Data Protocol (PDP).

17.3  Access points.

17.4  PDP context types.

18   TLS.

18.1  Introduction.

18.2  TLS Record Protocol.

18.3     TLS Handshake Protocol.

18.4            Summary.

19  Diameter.

19.1  Introduction.

19.2  Protocol components.

19.3  Message processing.

19.4  Diameter clients and servers.

19.5  Diameter agents.

19.6  Message structure.

19.7  Error handling.

19.8  Diameter services.

19.9  Specific Diameter applications used in 3GPP.

19.10  Diameter SIP application.

19.11  Diameter credit control application.

19.12  Summary.

20   MEGACO.

20.1  Introduction.

20.2  Connection model.

20.3  Protocol operation.

21   COPS.

21.1  Introduction.

21.2  Message structure.

21.3  COPS usage for policy provisioning (COPS-PR).

21.4  The PIB for the Go interface.

21.5  Summary.

22   IPSec.

22.1  Introduction.

22.2  Security associations.

22.3  Internet Security Association and Key Management Protocol (ISAKMP).

22.4  Internet Key Exchange (IKE).

22.5  Encapsulated Security Payload (ESP).

22.6  Summary.

23    Signalling Compression.

23.1  SigComp architecture.

23.2  Compartments.

23.3  Compressing a SIP message in IMS.

24   DHCPv6.

24.1  DHCP options.

24.2  DHCP options for SIP servers.

25.  XCAP.

25.1  XCAP application usage.

26   Common Policy.

26.1  Introduction.

26.2  Model and Rule Structure.

26.3  Data Types and Permission Processing.

List of Abbreviations.

References.