SIPit 30 was hosted by Cisco and held in Raleigh, NC from February 11-15, 2013. As usual the event proved invaluable for all attendees, with a total number of reported defects nearing 100 (I'm sure there were many more unreported defects). As well as traditional SIP audio endpoints, the trend of vendors with video enabled endpoints continued, as this event provides huge value to those seeking to improve their video interoperability. The official event summary can be found here: SIPit 30 Event Summary.
A new comer to the SIPit events this year was Web-RTC interoperability. A number of vendors tested interoperability with each other and the new Web-RTC technology in the Mozilla/Firefox and Chrome browsers.
If you have a SIP implementation and haven't attended these events, I highly recommend you look into the value that this event provides. http://www.sipit.net
The SIPit, or Session Initiation Protocol Interoperability Test, is a weeklong event where people bring their SIP implementations to ensure they work together.
Each SIPit is open to anyone with a working SIP implementation. The goal of the events is to refine both the protocol and its implementations. SIPit is a driving force shaping SIP into a globally interoperable protocol for real time Internet communication services.