40540 «IMS Overview»

Course Code




This is an overview course for IMS (IP Multimedia Subsystem) and the IMS Multimedia Telephony. The course explains why IMS is needed and the benefits for the operator and the users.

The IMS overview course explores the concepts, architecture, signaling protocols and functionalities of IMS


Learning objectives

On completion of this course the participants will be able to:

    • Understand why IMS is needed
    • Explain what is the Internet Protocol Multimedia Subsystem (IMS)
    • Example of IMS Services.
    • Explain what multimedia is.
    • Briefly describe the IMS solutions.
    • Explain some operator and end-user benefits of IMS.
    • Explain where IMS is positioned within the total telecoms picture.
    • Explain the services provided by IMS.
    • List some end-user services.
    • Describe the IMT end-user interface.
    • Explain how an IMT session is invoked from a user client.
    • Describe the IMS architecture.
    • Why a SIP Solution Based on 3GPP Standards?
    • IP Multimedia Subsystem Architecture.
    • Description of IMS-related Entities and Functionalities.
    • IMS Reference Points.
    • IMS Concepts.
    • Introduction to Detailed Procedures
    • Presence Service in IMS.
    • Group Management
    • Push to Talk Over Cellular.
    • Messaging.
    • Conferencing.
    • An Example IMS Multimedia Telephony Session
    • Multimedia Telephony
    • Describe how IMS interworks with the core IP network.
    • Explain how IMS interworks with PSTN and other VoIP networks.
    • Explain how IMS interworks with the mobile networks.
    • List the signaling and media protocols and describe where they are used.
    • Describe the QoS mechanisms for IP networks required by IMS.
    • Explain how a Multimedia session is established.
    • Explain the SIP & Diameter signaling sequence for Registration.
    • Explain the SIP signaling sequence for an IMS to IMS session.
    • Explain the SIP signaling sequence for an IMS to PSTN session.


Target audience

The target audience for this course is everybody that wants to understand why to use IMS and its basic functions



It is recommended that the participants will be familiar to basic telecom concepts.


Duration and class size

The recommended length of the course is 2 days depending on the participants’ background. The maximum number of participants is 16. However it is easy to adapt the course length to the actual needs, thanks to the modular structure.


Learning situation

This course is based on theoretical instructor-led lessons given in a classroom environment.