Name of module


Contents (main topics)

Drivers and enablers


The driving forces behind the evolution of multimedia

over IP networks are studied.



A quick look at who is doing what regarding


The Session

Initiation Protocol,



SIP is the main protocol used in IMS to enable

services. The protocol is studied to a level that

makes it possible to understand the use of it in IMS.

The Session

Description Protocol,



SDP is used to describe the media exchanged

between subscribers connected to IMS. The protocol

is studied in order to understand how media format is


Media transport


The transport of media using Real Time Protocol is

studied as well as related areas.

Media encoding


Standard codecs for voice and video are quickly


Building-blocks of



IMS is a completely new subsystem of UMTS with

many functions distributed in many different network

elements. This module describes so to say what the

IMS system consists of.

Procedures in IMS


This module describes how registration and sessions

are handled by IMS by means of some examples

(traffic cases).

Quality of service


Quality of service must be handled in order to create

attractive services. This module describes how IMS

interacts with GPRS to guarantee quality of service.



IMS is able to charge for usage of services and this

module describes how charging has been

implemented in IMS.

Voice services in



Voice services in LTE is studied in general (Volga,

VoLTE and CS Fallback) and then a detailed study of

the IMS-based solution VoLTE.


IP Multimedia Subsystem and Voice over LTE



This 2-day course gives a broad overview of the IP Multimedia Subsystem that will be an

essential part of future mobile systems. The course then describes how voice services will be

handled in LTE with special focus on the IMS-based solution referred to as Voice over LTE (VoLTE).


Course Objectives

The main objective of this course is to give an overview over IMS in order to understand its

structure and main characteristics. Part objectives are:


  • to describe the drivers and enablers making this happen
  • to describe the standardisation work behind IMS and which organisation that is being standardising what
  • to briefly understand the functions of the two fundamental protocols SIP and SDP
  • to describe how media handled by IMS can be transported and encoded
  • to describe the main building-blocks of IMS
  • to describe how IMS handles registration and other basic procedures
  • to describe how security is handled by IMS
  • to describe how IMS interacts LTE to assure quality of service
  • to describe how charging is done by IMS
  • to describe how voice is handled by LTE and special focus on VoLTE.


Target Group

The course should be seen as a starter for anyone who will directly or indirectly work with

IMS or services executed by IMS such as VoLTE.


Previous Knowledge

The course will touch areas such as Internet and mobile networks (UMST, LTE) but on a

high level. The more the trainees know about today’s mobile network (UMTS and LTE), the

better. It is recommended that trainees have some basic knowledge in Internet protocols

such as IP, TCP, and UDP. However, this is an introduction course and it is possible to

understand the course without this knowledge.



The course is planned as a 2-day course with theoretical lessons and theoretical exercises.

This means that there are about 6+6 lessons during these two days.



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