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file icon Application Composition in the SIP Servlet Environment (2007)
29.06.2007
This paper, presented at ICC 2007 describes application composition as it applies to the JSR 289 SIP Servlet 1.1 specification. Also described is the implementation of a 289-style application router for JSR 116 SIP Servlet 1.0 containers. This is the same implementation that can be downloaded from echarts.org as part of the ECharts for SIP Servlets DK or as a standalone library.

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file icon ECharts: Balancing Design and Implementation (2002)
11.02.2006
In this paper we argue that the semantics of UML Statecharts, while adequate for design, is inappropriate for implementation. To address the issues raised, we propose a language, ECharts, that incorporates modifications to UML Statecharts. We argue that the ECharts semantics strike the right balance between supporting design and supporting implementation. We compare ECharts language features with comparable features in UML Statecharts and ROOMcharts. We draw motivating examples from an IP-based telecom services platform which uses our implementation of ECharts on a daily basis for design and implementation. This is an old paper (2002) so the language syntax is outdated and some of the language features have changed a bit (notably 'return value' semantics). However this paper provides the justification for why we embarked on developing yet another language rather than adopting one of the existing Statecharts dialects.
file icon ClickToDial with ECharts for SIP Servlets: A Case Study
06.02.2008
This document presents a case study using the ECharts for SIP Servlets framework to develop a click-to-dial IP telecommunications application. The click-to-dial application is a converged one, that is, it possesses both a SIP component for managing phone calls and an HTTP component for managing a web-based user interface. The goal of this study is to familiarize developers with the benefits of using the open source ECharts for SIP servlets framework; a framework to develop SIP servlets. The approach taken is to “hijack” a traditional implementation of the click-to-dial application and then replace its SIP servlet with one developed using ECharts for SIP Servlets. A comparison of the original and revised examples reveals how simple it is to develop re-usable, composeable, maintainable SIP servlets using ECharts for SIP Servlets. The document includes instructions for building, deploying and running the click-to-dial application.
file icon Converged IP Telecom Services and Mashups
24.10.2008
A presentation made at the IIT VoIP Conference and Expo. Abstract: Convergence isn't just happening for devices, it's also happening for applications. Application convergence provides a user experience that seamlessly blends hitherto separate application domains. Web services, service-oriented architectures and service mashups are touted as technologies that will enable application convergence but, unfortunately, IP telecommunications applications aren't readily handled by these approaches. On the other hand, integrating IP telecommunications services with web services holds enormous potential for rapidly developing customized telecom applications. In this talk I will discuss the challenges associated with developing converged telecom services and the technologies and standards that are emerging to address these challenges.
file icon Converge: A Framework for Rapid Development of Converged Telecom Applications
10.12.2009
In 2004 Ruby on Rails blazed a new trail for web application development frameworks. Its intuitive, high-level abstractions and conventions supported development of web applications at unprecedented speed. Today a developer can choose from a wide selection of competing "full-stack" frameworks to identify one that meets their language or deployment requirements. However the story is different for developers who wish to incorporate telecom functionality with their web apps. Only this past summer were the first three telecom application development frameworks released. The goal of all three frameworks is to integrate telecom application development with established approaches to web application development. In this talk I will provide an overview of one of these: my own framework called Converge. Converge provides a bridge between our own ECharts for SIP Servlet (E4SS) telecom application development framework and the Grails web application development framework. Converge enables a developer to combine reusable E4SS telecom components with Grails web applications in order to rapidly develop complex converged (telecom + web) applications. Gregory W. Bond, presentation to AT&T Labs Research, Dec. 10, 2009.
file icon SIP Application Composition - IPTComm 2007 Tutorial Presentation
23.07.2007
The slides presented at Eric Cheung's and Hal Purdy's IPTComm 2007 tutorial entitled "A Standards Based Software Environment for Providing SIP Application Composition". A nice overview of SIP application composition and its support in the upcoming JSR 289 SIP Servlet standard.
file icon ECharts: From Lab to Production (2005)
11.02.2006
This paper summarizes our experience with ECharts, a state machine language that played a key role in the design and implementation of AT&T CallVantage, a nationally deployed voice-over-IP service. The introduction outlines the history of the language, including the original design requirements for the language, our realization that existing languages did not meet the requirements, and the evolution of the language as the project moved from prototype to production software. The language features most relevant to modularity and efficient use of resources are presented, and the operational semantics is summarized. Finally, ongoing work on new language features and on using ECharts to model BoxTalk, a telecommunication service programming language, is discussed. This is a more recent paper (2005) that provides a nice historical overview of the language and a quick look at the language features. However, the paper isn't so new that it uses the current language syntax.
file icon Timed Transition Activation Semantics in Statecharts (2005)
05.04.2006
We propose an intuitive semantics for timed transition activation in hierarchical state machine languages like UML Statecharts or Harel Statecharts. The semantics presented here explain precisely when the timer implicitly associated with a timed transition is activated, and possibly deactivated, during a machine's execution. In addition to the semantics, a decision procedure is given which serves to determine if a timed transition should be activated. These semantics serve as a necessary contribution towards the goal of formalizing Statecharts languages, and towards the ultimate goal of performing quantitative, temporal analysis of unrestricted Statecharts models.
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