Experiences while deploying IMS and the benefits brought by relying on Kamailio and open source for building flexible IMS platforms. Not many took the challenges of developing IMS extensions, even fewer could keep it going, this talk comes to present that IMS implementation is mature, with key deployments world wide, at a moment when this technology has to become the core of 4G+ networks.

1. Kamailio and the
IP Multimedia Subsystem (IMS)

2. (very) Basic IMS Architecture overview

3. Where do we stand?
● Integration of IMS (OpenIMS-Core) started 2010
● By now, all basic IMS functionality is ready:
● SIP-Proxies (Proxy-/Interrogating-/Serving-CSCF)
● With according Diameter-Interfaces (Rx, Cx/Dx, Ro)
● All necessary components are part of Kamailio 4
All components are stable, reliable & fast!

4. What is missing?
(according to IMS specs)
● IPSec (aka. the „GM“-Interface)
● Emergency-CSCF (for emergency services)
● … some fine tuning
That's about it!

5. GSMA's RCS and Kamailio
● SIP/SIMPLE is integrated in Kamailio for years
● Including Extensions for RLS & Conferencing
● Including an XMPP Gateway functionality
● Integrated XCap-Server was added in 2010
● Integrated MSRP-Relay was added in March 2012
All protocols for
GSMA's RCS-Standards implemented!

6. Other thoughts on IMS
„IMS is about keeping old business models and
preserving them in the new technichal platform,
instead of using the potential of the new technology
to change business models.“
(Olle E. Johansson)

7. New business models? Fine, but...
…don't you still want:
● an efficient network?
● a secure network?
● a reliable network?
● billing?

8. Don't re-invent the wheel!
Billing & Charging:
● Diameter Ro-Interface in Kamailio*
● Pre- and Postpaid billing
● Tested against jBilling, Ericsson Prepaid-Server,
Mobicents and others... ;-)
*) available in the next Kamailio release

9. An efficient & reliable setup
Goals:
● Maximum reliability & security
● Shortest Media-Path for efficiency & quality
● Scaling factors

10. An efficient & reliable setup

11. Conclusion
● IMS provides all core functions for your network
● Registration, Call-Routing, Security, Scalability,
Billing, Authorization, Authentication, ...
Focus on building applications
Instead of re-inventing the wheel again!

12. People involved in IMS on Kamailio
Jason Penton & Richard Good
Smile Communications (South Africa)
Alexis Marcou & Camille Oudot
Orange (France)

13. Questions?

14. Thank you!
Contact: www.ng-voice.com - carsten@ng-voice.com