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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.

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.

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

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)

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Updated by laforge almost 2 years ago ยท 4 revisions

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