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1/29/07 - SIPit 20 will be hosted by Alcatel-Lucent April 16-20, 2007 in Antwerp, Belgium. The registration website will be online in a few days.


SIPITs, or Session Initiation Protocol Interoperability Tests, are weeklong events where people bring their SIP implementations to ensure they work together.

The SIPITs are open to anyone with a working SIP implementation. The goal of the events is to refine both the protocol and its implementations. The SIPITs are a driving force shaping SIP into a globally interoperable protocol for real time Internet communication services.

Currently, the SIPITs are held twice a year. Different companies or organizations host each event, and each host chooses the venue.

The SIP Forum coordinates these events (Robert Sparks is the current coordinator).


  • Tools for generating certificates for S/MIME and TLS testing (provided by Cullen Jennings)
  • Known bugs in the specifications
  • Additional resources from the SIP working group

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