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

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

Learn how VoWiFi works with IMS & EPC, explore IPsec tunnel, call flows, ePDG discovery, signaling & bearer mapping

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.