1. Commetrex Corporation FoIP Challenges in the Real World FoIP Interoperability Workshop San Francisco, November 10, 2008

2. Commetrex’ FoIP Cred 1999, Commetrex ships T.38 relay 2001, Commetrex invents terminating T.38 2002, Commetrex opens T.38 Interop Lab 2005, BladeWare SIP-based fax media server 2007, Commetrex ships T.38 V3 2008, Commetrex ships T.38 w/ V.34

3. Interop Evolution Level I:T.38 Level II: SIP, gateway-to-gateway Level III:Service networks Level IV: Network-to-network

4. Level I: T.38 Interoperability Lab 2002-2004

5. Testing Partners Sonus Nuera Cisco Mediatrix Excel Lucent Etc.

6. G.711 Pass-Through Private or public network Jitter/delay/loss/PCM clock synchronization When is it successful? Enterprise LAN Metro networks Open Internet

7. Level II: Gateway-to-Gateway HMP fax media server Terminating T.38 G.711 pass-through SIP…nothing fancy BladeWare

8. Level III: Service Networks Homogeneous…private B2BUAs/application servers Proxy servers REINVITES Poor service-network architectures

9. Stage IV: Network-to-Network Access providers Backbone

10. Stage IV: VoIP Access Providers Gafachi Packet8 Cbeyond Bandwidth.com For example:

11. Backbone Carriers Global Crossing XO Communications Level(3) iBasis Inmarsat

12. Dealing With the Carrier SIP issues T.38 issues Registration/authentication When SBCs get into the act. G.711 vs T.38 Knowledge (How do you spell “fax”?)

13. SIP/T.38 Options Redundancy or FEC Redundancy depth ECM ? re-INVITEs when session timers are used (RFC4028)

14. FoIP-Specific SIP Considerations SBC 300-second half-duplex problem Session Timers (1300 sec)?

15. Network-to-Network

16. SIP Trunking SIPconnect Nailed-up IP Registration Authentication

17. A Need We See Communicate, y’all!

18. Proposal to Carriers: Open Up! Train your people Put network details on the Web Put access details on the Web Put FoIP details on the Web T.38 support T.38/SIP options Interop/compatibility requirements and testing

19. Call Centric.com