AT&T's ECharts releases beta for Sailfin
By alexismp on Nov 27, 2007
ECharts is open source software to program SIP Servlets with feature boxes, SIP message ports, and state-machine logic rather than overriding servlet methods and managing sessions.
ECharts for SIP Servlets DK also includes a JSR289-compliant application router implementation that enables SIP Servlet 1.1 application composition.
Check this ECharts for SIP Servlets Screencast for a feel of what it's like to program a back-to-back user agent application using the ECharts language (syntax similar to Java, only with "states" and "transations").