Voice over LTE (VoLTE) Fundamentals

3 Day Course
Code PWS210

Book Now - 1 Delivery Method Available:

Classroom Virtual Classroom Private Group - Virtual Self-Paced Online


This course investigates the options available to handle voice calls in an Evolved Packet System cellular network.

Topics covered during this course will include; CS Fallback, Voice over LTE via GAN (VoLGA), SRVCC and Voice over IMS. We will explore the Session Initiation Protocol (SIP) registration procedure together with call flows for IMS to IMS, IMS to PSTN and 36/4G to LTE call scenarios.


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Introduction to 4G LTE Air Interface & Core Network

Rich Communication Suite (RCS)

Introduction to the Voice options (4 topics)

  • CSFB
  • VoLGA
  • Voice over IMS

Circuit Switched Fallback (CSFB) (1 topic)

  • Call flow example

VoLGA (1 topic)

  • Call flow example

Single Radio Voice Call Continuity (SRVCC) (1 topic)

  • Call flow example

IP Multimedia Subsystem (IMS) (5 topics)

  • Components
  • CSCFs
  • HSS & AAA
  • Fixed & Wireless IMS Access
  • IMS Registration Flow

IMS Architecture, Interfaces and Protocols

VoIP protocols (6 topics)

  • SIP
  • SDP
  • RTP
  • RTCP
  • RTSP
  • SIP Call Session Flows

IMS Operational Scenarios for VoLTE

SMS Support in IMS

Voice over the LTE Air Interface

Supporting Protocols (4 topics)

  • ROHC
  • DRX
  • SCTP

Additional Learning

The courses below may help you meet the knowledge level required to take this course.

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