ECharts is a state machine-based programming language which supports Java as a host language. E4SS (ECharts for Sip Servlets) has introduced native support for SailFin some time back. This special build consists of a JSR 289 based application router, which can be directly deployed to SailFin SIP container.

Recently, Gregory Bond from AT&T, has come up with a tutorial style article describing in detail how to use E4SS, Grails and SailFin to implement, build and run a simple converged telecom application. Also checkout some screen shots at the end of the document.

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. SailFin Milestone 2 is supported in the latest ECharts for SIP Servlets DK (version 2.2 beta), providing thus a full open source solution. More details on the combination here.

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").