Open Source IMS Client

h1. Open Source IMS client

This project is about the current work in progress / exploration of putting together and extending a variety of components in order to implement an open source client for [[IMS]], specifically how it is used in [[VoLTE]] and [[VoWiFi]].

The current work-in-progress bases around the use of modified versions of StronSWAN and [[doubango]].

The idea is to develop this entirely on a standard GNU/Linux operating system (laptop) with a SIM card reader attached.  Once that works, we can then transplant that into a target platform, such as Ubuntu Touch or any suitable Linux based smartphone OS.

h2. Current state

* using the modified StrongSWAN it is possible to establish the SWu interface for [[VoWiFi]], at least once (something preventst it from working subsequent times). Tested against T-Mobile Germany ePDG.

* using the modified [[doubango]], it is possible to perform Initial IMS registration (SIP REGISTER dance with the associated sec-agree key handshake, etc.) against a [[Kamailio IMS Core]].

h2. Current areas of work

* SIM card interface in [[doubango]], see #5481

* Going beyond SIP REGISTER towards testing actual IMS calls with doubango

* clean-up of current patches, making things more stable

h2. TODO / next steps

* running doubango on top of strongswan for the two nested IPsec tunnels, see #5484

* testing doubango against commercial IMS operators (using Strongswan SWu or possibly a LTE modem that allows IMS default bearer establishment)

h2. Further wiki pages

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