pdf_gross.gifIMS and SIP Signaling – VoLTE

[2-day course, Euro 2,350.- (net) per participant]

backtotop.gifTraining Course Description


  • Course DescriptionThe main focus of this course is on VoIP for the packet-only LTE network with IMS interaction based on SIP/SDP.
  • The course describes the voice over LTE capabilities with a special focus on IMS and the signaling protocol SIP / SDP.
  • We will start with an overview on the IMS related architecture with special focus on the LTE Access network and 3GPP interworking with other RATs.
  • We will then introduce the bearer concept and QoS architecture in LTE / SAE discussing the signaling for default and dedicated bearer setup, e.g. IMS triggered with the interaction with the policy functions (PCRFs).
  • The purpose of the main architecture elements will be explained focusing in a sort of data sheet for each logical element. Other control entities,such as public, private and service identities, their relationsship and use will be explained in detail in order to understand service routing capabilities.
  • A central part will be an introduction to the signaling and media stream protocols, such as SIP / SDP, Diameter for policing and RTP / RTCP and their applicability for voice and other media transport inLTE.
  • This protocol section will be completed with a review of the softswitch architecture as required by LTE for a roaming environvironment with voice support, introducing the architecture and fucntionality of Media Gateway Controllers and associated Media Gateways.
  • We will then discuss in detail the alternatives for voice over LTE – with and without IMS support, such as SRVCC, CS Fallback and also quickly review other solutions such as VoLGA etc.
  • Related scenarios and different use case for SRVCC and CS Fallback – including SMS transmission – will then conclude the course.

Some of your questions that will be answered

  • Why is IMS becoming an important function for LTE deployments supporting roaming voice subscribers?
  • What are the main controlling entities for voice support in an IMS / LTE system environment?
  • How are voice bearers identified and handled distinct from other services?
  • How are sessions initiated and controlled, what is meant by a transaction, a SIP call and a SIP dialog?
  • How are SIP transactions and dialogs identified? What are the most important header fields and their purpose?
  • Where and for what purpose is Diameter protocol being used in a network deploying voice over LTE?
  • Which mandatory codec types have to be supported for the media stream?
  • How does a softswitch work and what are its main components and signaling interfaces?
  • What is CS Fallback and when and where is it applicable? How is CSFB signaled / triggered?
  • What is SRVCC and when and where is that applicable? How is this distinct from CSFB?
  • How is SMS handled in an LTE voice environment and what are the alternatives for SMS here?

backtotop.gifWho should attend this class?

  • Design engineers who need to understand Voice over LTE protocols, features and interfaces.
  • Anyone who need to understand the VoLTE terminology, features, interfaces and the applicability in future 3GPP networks.


  • The student must possess a sound understanding of network architectures in 3GPP. There is no particular knowledge required regarding IMS and SIP/SDP.
  • We do recommend our webinar or web based training courses on LTE as preparation for the course in order to improve efficiency and comprehension.

backtotop.gifTraining Course Target

  • The student is enabled to understand particular voice requirements for LTE networks and is entitled to maintain and operate such networks.

backtotop.gifTraining Course Duration

  • 2 days




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