ExperTeach Networking Logo

IP Multimedia Subsystem

Telephony in Fixed and Mobile Networks

ExperTeach Networking Logo

The IP Multimedia Subsystem (IMS) is a major component of Next Generation Networks. IMS offers providers overall access to services via the Internet protocol. 3GPP and ETSI define the servers, switching points, and communication relations and processes. The central protocol is SIP. The IMS standards describe security measures as well as concepts to ensure Quality of Service. This course gives the student a conceptual insight into the IP Multimedia Subsystem. The detailed know-how required to understand and competently evaluate IMS concepts is achieved by means of an exhaustive discussion of the used protocols and processes.

Course Contents

  • The State of the Art: Voice, Data, and more
  • IMS Standards of ETSI, 3GPP, and IETF
  • Architecture of the NGN: Central Technologies and Components
  • The IMS Architecture: Components and Reference Points
  • Call Session Control Functions and their Tasks
  • Session Border Controller and Media Gateways
  • Signaling with SIP in IMS: Examples
  • The Diameter Protocol in the IMS
  • Login Procedures with RADIUS and Diameter
  • Home Subscriber Server and Billing
  • Security, Legislation, and Regulatory Measures

Print E-Book PDF Symbol You will receive the comprehensive documentation package of the ExperTeach Networking series – printed documentation, e-book, and personalized PDF! As online participant, you will receive the e-book and the personalized PDF.

Target Group

This course is designed for network designers and consultants who are interested in gaining a thorough insight into this concept. In addition to explaining the structure and the most important processes, the course deals with the protocols used and discusses open issues and risks.

Knowledge Prerequisites

Knowledge of state-of-the-art WAN technologies and structures in carrier networks, as well as of the functioning of IP-based networks and a basic know-how of the SIP protocol are prerequisites for a successful participation in the course.

Alternatives

The topic of IMS is also be treated in the Next Generation Networks - Architecture & Design course, but not in such a detailed form as in the course at hand.

1 Introduction and Motivation
1.1 Services in the Provider Network
1.1.1 Classic Telephony
1.1.2 Services in the Internet
1.1.3 IP-based Telephony
1.2 IMS Switching Architecture
1.3 IMS Standardization
1.3.1 IETF—Internet Standards
1.3.2 3GPP—3G Partnership Project
1.3.3 ETSI—The European Idea with TISPAN
1.3.4 PacketCable™
1.3.5 The Open Mobile Alliance
1.4 IMS Access
1.4.1 Demands Made on the Access Network
1.4.2 Public Switched Network
1.4.3 Broadband Cable
1.4.4 LTE
1.4.5 OTT
1.5 A First Glance on the IMS
1.5.1 The IMS Architecture
1.5.2 The Main Protocols in the IMS
2 Components and Protocols
2.1 Overview
2.2 SIP—Session Initiation Protocol
2.2.1 The Basic Idea of SIP
2.2.2 The Components of the SIP Architecture and their Tasks
2.2.3 End Points and Addressing
2.2.4 Protocol Setup
2.2.5 The SIP Message
2.3 Diameter
2.3.1 Elements
2.3.2 Header
2.3.3 The Command Codes
2.3.4 Attributes—A Selection
2.4 MeGaCo
2.4.1 The Idea
2.4.2 The Commands
2.5 Payload Data Transport
2.5.1 Voice Encoding and Compression
2.5.2 RTP—Transport and Reconstruction Functions
2.5.3 Messaging
3 The IMS Architecture
3.1 The General Setup of the IMS
3.2 Control Functions
3.2.1 P-CSCF
3.2.2 I-CSCF
3.2.3 Serving CSCF
3.3 Application Server
3.4 Media Resource Function
3.5 Databases
3.5.1 The User Profile
3.5.2 Initial Filter Criteria
3.6 Gateways
3.6.1 Interworking with the PSTN
3.6.2 WebRTC Gateways
3.6.3 IMS AGW/Session Border Controller
3.7 Interconnection
3.8 Access-specific Extensions
3.9 Call Flows
3.9.1 SIP Routing—Path and Service Route
3.9.2 IMS Registration
3.9.3 UE to P-CSCF REGISTER
3.9.4 REGISTER Error Conditions
3.9.5 Authentication
3.9.6 PS-to-PS Call (1)
3.9.7 PS-to-CS Call
4 IMS and Mobile Communications
4.1 Voice over LTE (VoLTE)
4.1.1 PCC
4.1.2 Registration Procedure
4.1.3 VoLTE Call Setup (Principle)
4.1.4 Bearer Handling
4.1.5 VoLTE Call Termination (Principle)
4.2 Enhanced Single Radio Voice Call Continuity
4.2.1 SRVCC Variants
4.2.2 T-ADS
4.3 Non-3GPP Access
4.3.1 Untrusted WLAN
4.3.2 Call Setup
4.3.3 ANDSF
4.4 RCS
A List of Abbreviations

Classroom training

Do you prefer the classic training method? A course in one of our Training Centers, with a competent trainer and the direct exchange between all course participants? Then you should book one of our classroom training dates!

Hybrid training

Hybrid training means that online participants can additionally attend a classroom course. The dynamics of a real seminar are maintained, and the online participants are able to benefit from that. Online participants of a hybrid course use a collaboration platform, such as WebEx Training Center or Saba Meeting. To do this, a PC with browser and Internet access is required, as well as a headset and ideally a Web cam. In the seminar room, we use specially developed and customized audio- and video-technologies. This makes sure that the communication between all persons involved works in a convenient and fault-free way.

Online training

You wish to attend a course in online mode? We offer you online course dates for this course topic. To attend these seminars, you need to have a PC with Internet access (minimum data rate 1Mbps), a headset when working via VoIP and optionally a camera. For further information and technical recommendations, please refer to.

Tailor-made courses

You need a special course for your team? In addition to our standard offer, we will also support you in creating your customized courses, which precisely meet your individual demands. We will be glad to consult you and create an individual offer for you.
Request for customized courses
PDF SymbolYou can find the complete description of this course with dates and prices ready for download at as PDF.

The IP Multimedia Subsystem (IMS) is a major component of Next Generation Networks. IMS offers providers overall access to services via the Internet protocol. 3GPP and ETSI define the servers, switching points, and communication relations and processes. The central protocol is SIP. The IMS standards describe security measures as well as concepts to ensure Quality of Service. This course gives the student a conceptual insight into the IP Multimedia Subsystem. The detailed know-how required to understand and competently evaluate IMS concepts is achieved by means of an exhaustive discussion of the used protocols and processes.

Course Contents

  • The State of the Art: Voice, Data, and more
  • IMS Standards of ETSI, 3GPP, and IETF
  • Architecture of the NGN: Central Technologies and Components
  • The IMS Architecture: Components and Reference Points
  • Call Session Control Functions and their Tasks
  • Session Border Controller and Media Gateways
  • Signaling with SIP in IMS: Examples
  • The Diameter Protocol in the IMS
  • Login Procedures with RADIUS and Diameter
  • Home Subscriber Server and Billing
  • Security, Legislation, and Regulatory Measures

Print E-Book PDF Symbol You will receive the comprehensive documentation package of the ExperTeach Networking series – printed documentation, e-book, and personalized PDF! As online participant, you will receive the e-book and the personalized PDF.

Target Group

This course is designed for network designers and consultants who are interested in gaining a thorough insight into this concept. In addition to explaining the structure and the most important processes, the course deals with the protocols used and discusses open issues and risks.

Knowledge Prerequisites

Knowledge of state-of-the-art WAN technologies and structures in carrier networks, as well as of the functioning of IP-based networks and a basic know-how of the SIP protocol are prerequisites for a successful participation in the course.

Alternatives

The topic of IMS is also be treated in the Next Generation Networks - Architecture & Design course, but not in such a detailed form as in the course at hand.

1 Introduction and Motivation
1.1 Services in the Provider Network
1.1.1 Classic Telephony
1.1.2 Services in the Internet
1.1.3 IP-based Telephony
1.2 IMS Switching Architecture
1.3 IMS Standardization
1.3.1 IETF—Internet Standards
1.3.2 3GPP—3G Partnership Project
1.3.3 ETSI—The European Idea with TISPAN
1.3.4 PacketCable™
1.3.5 The Open Mobile Alliance
1.4 IMS Access
1.4.1 Demands Made on the Access Network
1.4.2 Public Switched Network
1.4.3 Broadband Cable
1.4.4 LTE
1.4.5 OTT
1.5 A First Glance on the IMS
1.5.1 The IMS Architecture
1.5.2 The Main Protocols in the IMS
2 Components and Protocols
2.1 Overview
2.2 SIP—Session Initiation Protocol
2.2.1 The Basic Idea of SIP
2.2.2 The Components of the SIP Architecture and their Tasks
2.2.3 End Points and Addressing
2.2.4 Protocol Setup
2.2.5 The SIP Message
2.3 Diameter
2.3.1 Elements
2.3.2 Header
2.3.3 The Command Codes
2.3.4 Attributes—A Selection
2.4 MeGaCo
2.4.1 The Idea
2.4.2 The Commands
2.5 Payload Data Transport
2.5.1 Voice Encoding and Compression
2.5.2 RTP—Transport and Reconstruction Functions
2.5.3 Messaging
3 The IMS Architecture
3.1 The General Setup of the IMS
3.2 Control Functions
3.2.1 P-CSCF
3.2.2 I-CSCF
3.2.3 Serving CSCF
3.3 Application Server
3.4 Media Resource Function
3.5 Databases
3.5.1 The User Profile
3.5.2 Initial Filter Criteria
3.6 Gateways
3.6.1 Interworking with the PSTN
3.6.2 WebRTC Gateways
3.6.3 IMS AGW/Session Border Controller
3.7 Interconnection
3.8 Access-specific Extensions
3.9 Call Flows
3.9.1 SIP Routing—Path and Service Route
3.9.2 IMS Registration
3.9.3 UE to P-CSCF REGISTER
3.9.4 REGISTER Error Conditions
3.9.5 Authentication
3.9.6 PS-to-PS Call (1)
3.9.7 PS-to-CS Call
4 IMS and Mobile Communications
4.1 Voice over LTE (VoLTE)
4.1.1 PCC
4.1.2 Registration Procedure
4.1.3 VoLTE Call Setup (Principle)
4.1.4 Bearer Handling
4.1.5 VoLTE Call Termination (Principle)
4.2 Enhanced Single Radio Voice Call Continuity
4.2.1 SRVCC Variants
4.2.2 T-ADS
4.3 Non-3GPP Access
4.3.1 Untrusted WLAN
4.3.2 Call Setup
4.3.3 ANDSF
4.4 RCS
A List of Abbreviations

Classroom training

Do you prefer the classic training method? A course in one of our Training Centers, with a competent trainer and the direct exchange between all course participants? Then you should book one of our classroom training dates!

Hybrid training

Hybrid training means that online participants can additionally attend a classroom course. The dynamics of a real seminar are maintained, and the online participants are able to benefit from that. Online participants of a hybrid course use a collaboration platform, such as WebEx Training Center or Saba Meeting. To do this, a PC with browser and Internet access is required, as well as a headset and ideally a Web cam. In the seminar room, we use specially developed and customized audio- and video-technologies. This makes sure that the communication between all persons involved works in a convenient and fault-free way.

Online training

You wish to attend a course in online mode? We offer you online course dates for this course topic. To attend these seminars, you need to have a PC with Internet access (minimum data rate 1Mbps), a headset when working via VoIP and optionally a camera. For further information and technical recommendations, please refer to.

Tailor-made courses

You need a special course for your team? In addition to our standard offer, we will also support you in creating your customized courses, which precisely meet your individual demands. We will be glad to consult you and create an individual offer for you.
Request for customized courses

PDF SymbolYou can find the complete description of this course with dates and prices ready for download at as PDF.