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file icon A Framework for Converged Telecom Services and Mashups (2008)
29.07.2008
We describe a light-weight, Java-based framework for SIP servlet 1.1 containers that enables the development of modular, reusable telecom features suitable for integration into converged services. We show how the framework supports interaction between a feature and its external environment and how it facilitates the discovery task in different scenarios. We also discuss how the framework enables feature reusability and provide representative examples of reusable features that use the framework. Finally we discuss how this framework can be utilized to support telecom service ``mashups'': customized web services that incorporate telecom services with other services. We also discuss issues that arise when incorporating telecom services into mashups.
file icon An Application Router for SIP Servlet Application Composition (Draft 2008)
18.01.2008
This paper, accepted at ICC 2008, describes the Distributed Feature Composition application router (DFC-AR) that is available as part of the ECharts for SIP Servlets DK or as a separate download. The DFC-AR has been proposed as the default AR in the SIP Servlet 1.1 reference implementation (as specified by JSR 289).

Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
file icon An Introduction to ECharts: The Concise User Manual (2008-05-20 v1.3-beta)
20.05.2008
This document provides a concise example-driven overview of the ECharts language and its features. Many simple examples are provided to familiarize the reader with the language’s textual and graphical syntax, and its semantics. The document also provides instructions for compiling, executing, debugging and generating documentation for ECharts machines.
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.

Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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 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 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 ECharts for SIP Servlets Manual (2009-04-09 v2.5-beta)
13.04.2009
This document describes the ECharts for SIP Servlets (E4SS) framework and development kit. E4SS makes use of the ECharts programming language as an alternative programming model built on the SIP Servlet API defined by the Java Community Process. Instead of overriding servlet methods and managing sessions, the programmer defines the application in terms of feature boxes, SIP message ports, and state-machine logic specified in the ECharts language. The use of ECharts to specify application logic greatly encourages component re-use and manages complexity, making it well-suited for Back-to-Back User Agent applications. Such applications can be composed with one another and with suitable proxy applications in order to provide feature-rich services while maintaining feature modularity, through use of a SIP Servlet Application Router. This document explains the E4SS framework abstractions and provides example-driven descriptions of the tools and libraries included with the E4SS development kit. The document also provides instructions on how to configure two common SIP containers, SailFin and OCCAS, for use with E4SS.
file icon ECharts for SIP Servlets: a state-machine programming environment for VoIP applications (2007)
18.07.2007
A paper presented at IPTComm 2007. The paper provides a nice 10 page summary of ECharts and ECharts for SIP Servlets version 2.0.
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 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 Experience with Modularity in an Advanced Teleconferencing Service Deployment
12.06.2009
In this paper, we describe our experience with the design of an advanced teleconferencing service under two different frameworks — an early implementation of the Distributed Feature Composition architecture, and the SIP Servlet API. The usual design goals of software modularity for encapsu- lation and reuse are pursued. Interestingly, two very differ- ent designs resulted. This paper discusses the factors that influenced our design decisions. In particular, we examine the different characteristics of the two frameworks as well as the maturity of project requirements, and illustrate the ways in which these factors affect various mechanisms for achieving software modularity. We also aim to draw on this experience to propose a set of design guidelines for build- ing modular, composable SIP Servlet applications for Voice over IP and converged services. Eric Cheung and Thomas M. Smith, 31st International Conference on Software Engineering - ICSE-Companion 2009, pp. 39 - 49, Vancouver, BC, ISBN:978-1-4244-3495-4, DIO: 10.1109/ICSE-COMPANION.2009.5070962.
file icon Implementing Endpoint Services Using the SIP Servlet Standard
04.05.2009

Paper presented at the Fifth International Conference on Networking and Services (ICNS 2009).  The following is the abstract:


 Voice over IP applications at endpoint devices are typically implemented using proprietary methods and are closed and not extensible. This hinders innovation and competition. On the other hand, a number of open standards have emerged for programming network services. The SIP Servlet API is the dominant standard and is widely implemented. This paper examines the feasibility of using the SIP Servlet API for programming endpoint applications. An enterprise communication system is used as the case study.  This investigation shows that this is a promising approach with advantages such as application reuse and support for application composition. A number of issues are identified that may be addressed by enhancing the current SIP servlet container implementations.


Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

file icon KitCAT - A Framework for Converged Application Testing
17.11.2008

There is a growing demand for IP based multimedia services that encompass usage of multiple user interfaces including web and telephony. The complexity of such converged applications require sophisticated development tools and techniques and as a result a variety of technologies and standards have been developed or are in the process of development to address the complexity of application development and deployment. For example, application servers implementing the SIP servlet standard aids the application developer with development of SIP based applications and this, in conjunction with HTTP servlet standard, aids the development of converged applications based on the HTTP and SIP protocols. While such standards and tools enable the application developer to develop and deploy complex applications, there is a growing need for tools and techniques that can help application developers to do system level functional testing of converged applications. This paper makes the following contributions - (1) describes a conceptual model for testing converged applications (2) introduces a simple programming model for test case writers to exercise and test converged applications and (3) describes our converged application testing framework KitCAT that is a concrete implementation of (1) and (2).

file icon KitCAT User Manual
18.11.2008
This manual guides a user through installing KitCAT and then getting started with KitCAT test cases.
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