SIP interoperability test events are gatherings of SIP implementors to test interoperability of their creations. They take place roughly every four months, hosted by different companies and organizations. The first SIP interoperability event took place in August of 1999. The event is managed by a Technical Program Committee. Attendees and organizers should consult the general FAQ, while hosting organizations need more detailed information. The web site www.sipbakeoff.org also lists events and has web pages for earlier events.

SIP Bakeoff vs. Pillsbury: Pillsbury has threatened to sue Columbia University if we continue to use the term bake-off. They have more lawyers than we do, so they win. The University is too chicken/cheap to defend its faculty, unfortunately, thus the new name.

Information about past interoperability events (bake-offs) are available: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 11 12 13 14 15

• Classification of implementations
• SIP test messages
• Common bugs.
• SIP test scenarios with multiple participants; other possibilities:
  • switch from local ringing to remote ("early media") ringing during call setup;
  • multiple Record-Routes from Proxies over a call leg

    
                 Record-Route     Record-Route 
       UA1----------> P1 ------------> P2 -----------> UA2
    

  • request merging
  • Proxying of REGISTER requests.
  • End system inserts Route without corresponding Record-Route.

  Scenarios, particularly the multi-proxy one, are recommended only for participants that have thoroughly tested their implementation. One strong indication of such a test is the participation in a prior interoperability event.

  Starting at SIP Interoperability Event 6, scenario tests are allocated two hour slots, starting in the afternoon of the first day. Several similar scenarios can be done at the same time.

• SIP torture tests
• Draft interop document (IMTC SIP SIG), also