SIPit #27

All IP terminals aiming to establish any communication use Session Initiation Protocol (SIP). The goal of this interoperability event was to refine both the protocol and its implementations in order to ensure that SIP is a globally interoperable protocol for real time Internet communication services and to advance the adoption and interoperability of IP communications products and services based on SIP. SIP is a fundamental component in ETSI NGN (Next Generation Networks) and 3GPP IMS.
For this SIPit (SIP Interoperability testing) event, engineers were required to bring SIP implementations to ensure they work together according to the relevant IETF RFCs.
Each SIPit is open to anyone with a working SIP implementation. The event requires the installation of a basic IPv4 and IPv6 network over which SIP tests will be run. Provision of the test cases is the responsibility of the SIPit Forum.
Companies tend to bring both production and cutting-edge versions of thier implementations. The aim of the event is to test and improve the quality of the SIP specification. Each implementation improves as a natural side effect. 

This SIPit reinforced the continued growth of interoperability and availability of advanced features among seasoned implementations and introduced a large number of new implementations into interoperability tests. 

Fifty four participants attended this event from twenty four companies, there were thirty four distinct implementations testing throughout the week.

Some of the participating companies had not attended any previous SIPit interoperability events and several of these companies brought engineering prototypes which made the event more interesting for all participants.

the overall feeling from all participants was that the key players were present and their knowledge and helpfulness was key to making this event the great success that it was.