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Vowifi & Wifi Calling: Architecture, Call Flows & Ims Core
Published 6/2025
MP4 | Video: h264, 1920x1080 | Audio: AAC, 44.1 KHz
Language: English | Size: 1.25 GB | Duration: 5h 13m
Learn how VoWiFi works with IMS & EPC, explore IPsec tunnel, call flows, ePDG discovery, signaling & bearer mapping
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.
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.
Overview
Section 1: VoWiFi Basics: Concepts, Use Cases & Real-World Value
Lecture 1 VoWiFi Explained: What is WiFi Calling & How It Works
Lecture 2 Why VoWiFi Matters: Solving Indoor Coverage & Call Quality Issues
Section 2: VoWiFi vs VoLTE vs 3G: Technology, Call Quality & Network Impact
Lecture 3 VoWiFi, VoLTE & 3G: Key Technology Differences Explained
Lecture 4 Voice Quality Comparison: VoWiFi vs VoLTE vs 3G Performance Metrics
Lecture 5 Network Reach: Coverage & Service Availability Across VoWiFi, VoLTE, and 3G
Lecture 6 Architectural Comparison: IMS-Based VoWiFi vs Legacy Voice Systems
Section 3: VoWiFi Calling Essentials: Concepts, Prerequisites & Setup Needs
Lecture 7 VoWiFi Prerequisites: Device, Network & Core Network Capabilities
Lecture 8 Quick Intro to VoWiFi Calling: What It Is & How It Works
Section 4: VoWiFi Value: User Experience Gains & Operator Benefits
Lecture 9 VoWiFi Benefits for End Users & Mobile Network Operators (MNOs)
Lecture 10 Strategic Advantages of VoWiFi: From Indoor Coverage to Cost Savings
Section 5: VoWiFi Challenges: Technical Barriers, Limitations & Real-World Issues
Lecture 11 VoWiFi Deployment Challenges: Handover, QoS, Security & Device Limitations
Section 6: VoWiFi Core Architecture: Key Network Elements & Functional Roles
Lecture 12 Access Types in VoWiFi: 3GPP, Non-3GPP, Trusted & Untrusted Models
Lecture 13 UE Role in VoWiFi Architecture: Connectivity, Support & Limitations
Lecture 14 WiFi Access Point Function in VoWiFi: The First Connection Layer
Lecture 15 ePDG in VoWiFi: Role, Interfaces & IPsec Termination
Lecture 16 IPSec in VoWiFi: Secure Tunneling for IMS Access
Lecture 17 Step-by-Step: IPSec Tunnel Establishment in VoWiFi
Lecture 18 PGW Role in VoWiFi: Bearer Management & Policy Control
Lecture 19 PCRF in VoWiFi: Policy & QoS Control for IMS Traffic
Lecture 20 AAA Server in VoWiFi: Authentication, Authorization & Accounting
Lecture 21 P-CSCF in IMS: SIP Proxy Role in VoWiFi Call Setup
Lecture 22 I-CSCF in IMS: Entry Point for SIP Signaling in VoWiFi
Lecture 23 S-CSCF in IMS: Session Control in VoWiFi Services
Lecture 24 HSS in IMS: Subscriber Profile Management in VoWiFi
Section 7: Identifiers & Routing in VoWiFi: SIP URI, IMSI, FQDN & APNs
Lecture 25 SIP URI vs IMSI: Identity Handling & Session Targeting in VoWiFi
Lecture 26 FQDN in VoWiFi: Domain Resolution & DNS-Based Routing
Lecture 27 APNs in VoWiFi: IMS APN, Default Bearer & Data Path Setup
Section 8: VoWiFi Bearers Explained: IPsec Tunnel, EPC Mapping & QoS Flows
Lecture 28 VoWiFi Bearer Overview: Concepts, Functions & Flow Types
Lecture 29 IPSec Tunnel Setup in VoWiFi: Step-by-Step Signaling Flow
Lecture 30 Default Bearer Setup in VoWiFi: IMS APN Connectivity & QoS
Lecture 31 Dedicated Bearers in VoWiFi: Setup, QoS, and SIP Triggering
Lecture 32 Mapping EPC Bearers to IPsec Tunnel: Security & Flow Binding
Lecture 33 VoLTE vs VoWiFi Bearers: Architecture, Tunnel Use & QoS Control
Section 9: VoWiFi Protocol Stack: Interfaces, Protocols & Functional Mapping
Lecture 34 Overview of VoWiFi Interfaces & Protocols: Functional Layers & Roles
Lecture 35 SWu Interface in VoWiFi: IKEv2 Protocol for IPsec Tunnel Security
Lecture 36 S2b Interface Explained: GTP-C/U Role in Bearer Management
Lecture 37 Diameter Interfaces in VoWiFi: SWm, SWx & S6b Functional Breakdown
Section 10: VoWiFi Call Flows & ePDG Discovery: End-to-End Signaling Breakdown
Lecture 38 ePDG Discovery in VoWiFi: High-Level Process Overview
Lecture 39 ePDG Discovery: Detailed Signaling Message Flow in VoWiFi
Lecture 40 Initial Authentication Between UE & ePDG: Steps & Protocols
Lecture 41 Mobile-Originated VoWiFi Call Flow (Part 1): Signaling Path Initiation
Lecture 42 Mobile-Originated VoWiFi Call Flow (Part 2): SIP, Bearers & Media Path
Telecom engineers and network planners,Core network professionals (EPC, IMS, VoLTE),Students and fresh graduates in telecom
