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VoWiFi & WiFi Calling: Architecture, Call Flows & IMS Core
Highest Rated
Rating: 4.8 out of 5(11 ratings)
60 students

VoWiFi & WiFi Calling: Architecture, Call Flows & IMS Core

Learn how VoWiFi works with IMS & EPC, explore IPsec tunnel, call flows, ePDG discovery, signaling & bearer mapping
Highest Rated
Created byCore & IMS Learning
Last updated 5/2025
English

What you'll learn

  • Understand how VoWiFi works and how it integrates with IMS and EPC core network elements.
  • Analyze VoWiFi architecture including ePDG, PGW, AAA, and IMS components like P-CSCF and S-CSCF.
  • Establish secure IPSec tunnels using IKEv2 and follow their setup process step-by-step.
  • Identify how default and dedicated bearers are created and mapped in VoWiFi service.
  • Explore key VoWiFi interfaces like SWu, S2b, SWm, SWx, and S6b with related protocols.
  • Follow VoWiFi call flows and signaling messages for registration and MO/MT call setup.
  • Learn how SIP URI, IMSI, FQDN, and APN work together in VoWiFi session management.
  • Troubleshoot common VoWiFi issues such as authentication failures and DNS resolution errors.

Course content

10 sections • 42 lectures • 5h 13m total length

  • VoWiFi Explained: What is WiFi Calling & How It Works3:42
  • Why VoWiFi Matters: Solving Indoor Coverage & Call Quality Issues5:10

Requirements

  • Interest in telecom technologies and how voice services work over data networks.
  • Ability to follow call flows and signaling diagrams (no deep protocol expertise needed).
  • A basic understanding of mobile network concepts (2G/3G/4G/5G).

Description

Are you a telecom professional looking to master VoWiFi (Voice over WiFi) and understand how it integrates seamlessly into the IMS Core and Evolved Packet Core (EPC)? This course is your complete, practical guide to WiFi Calling — covering everything from basic concepts to advanced signaling flows, real-world deployment scenarios, and troubleshooting techniques.

You'll begin by understanding what VoWiFi is, how it differs from VoLTE and 3G voice services, and why it’s increasingly essential for improving indoor coverage, call quality, and user experience. From there, the course dives into VoWiFi architecture, detailing the roles and interactions of core elements like UE, ePDG, PGW, AAA, P-CSCF, I-CSCF, S-CSCF, and HSS.

You’ll gain in-depth knowledge of how IPSec tunnels are established, how default and dedicated bearers are managed, and how bearer mapping occurs between the EPC and the secure VoWiFi path. We’ll also explore how identifiers like IMSI, SIP URI, FQDN, and APNs are used to route and register VoWiFi sessions.

The course covers all critical protocols and interfaces including IKEv2, GTP-C/U, and Diameter across SWu, S2b, SWm, SWx, and S6b interfaces. You’ll follow real-world call flow diagrams, SIP signaling sequences, and learn how to troubleshoot common issues in VoWiFi authentication, tunnel creation, and call setup.

By the end, you'll be equipped to confidently analyze, design, and optimize VoWiFi services across mobile networks.

This is a must-have course for any telecom engineer, system integrator, or technical trainer working with IMS and packet core networks.

Who this course is for:

  • Telecom engineers and network planners
  • Core network professionals (EPC, IMS, VoLTE)
  • Students and fresh graduates in telecom

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