Presented to VoIP Users Conference on 9/11/2009

1. Trapezoidal VoIP is Evil Aswath Rao www.enthinnai.com VoIP Users Conference 9/11/2009

2. Trapezoid SIP? A’s UA B’s Proxy A’s Proxy B’s UA STP message flow RTP flow

3. Originator’s Proxy is called Outbound Proxy (evil!)

4. Yes, it provides authentication (though unreliable)

5. A needs to have a service provider

6. The two providers must agree to federate

7. Akin to ISPs requiring HTTP Proxy

8. Security needs may require it

9. Otherwise undesirable

10. Authentication?

11. OpenID is an answer Everybody (almost) has it

12. Let us turn to B’s Proxy

13. B’s Proxy is required

14. Discovery Dynamic DNS is a possibility. But how to handle white/black lists?

15. NAT/FW Traversal

16. Triangle is a fact of life

17. But B’s Proxy could be a self-hosted server

18. Putting it all together …

19. A uses OpenID to autheticate herself

20. B’s Proxy uses white/black list

21. Use of ICE for NAT/FW traversal

22. But common servers must be able to run Proxy/ICE SW

23. EnThinnai is a realization of these objectives

24. EnThinnai is an UC platform

25. Presence

26. Text/voice chat Exclusive use of Speex

27. Sharing of Digital information

28. Permissions based

29. Minimal client requirement – Java enabled browser

30. Minimal server requirement