Send in your ideas. Deadline October 1, 2024
Theme fund: User-operated Internet Fund
Start: 2021-08

Open source ePDG for VoWiFi

Enhanced Packet Data Gateway for mobile infrastructure

This project from the Osmocom community delivers an important contribution towards a fully open source mobile infrastructure, by implementing the first open source Enhanced Packet Data Gateway or ePDG. Inside the 3GPP cellular network architecture, the ePDG is the interface between the operator network and the public internet. Phones connect to the gateway in order to use VoWiFi (voice over WiFi) services. ePDG sits between the phone and the IMS core (same for VoLTE, VoWiFi and VoNR in 5G), and acts primarily as an IPsec gateway with ISIM card based authentication and key generation.

With efforts underway to create a fully open source FOSS based 4G network with a FOSS based IMS core with VoLTE functionality, having a FOSS ePDG is the only missing part for operating VoWifi from FOSS.

Run by sysmocom / Osmocom

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This project was funded through the User-Operated Internet fund, a fund established by NLnet made possible by financial support from the PKT Community/The Network Steward and stichting Technology Commons Trust. Your donation is welcome too.