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file icon Web 2.0 Phone Home: Rapid Development of Telecom-Enabled Web Applications
These are the slides from the JavaOne 2009 presentation by Greg Bond and Tom Smith where they introduced the Converge framework for rapid development of converged (telecom + web) applications. Abstract: "New open standards and open-source software let you add telecom capabilities, such as clicking a button to launch a phone call or automatically answering a call and forwarding it, to your Web applications. This session, for Web developers with no telecom background who want to add telecom capabilities to their Web applications and for telecom service developers looking to simplify development of their applications, provides a detailed look at how to rapidly develop telecom-enabled Web applications with open-source tools. It shows how the ECharts for SIP Servlets (E4SS) framework and the KitCAT test tool simplify development of telecom components based on the SIP Servlet standard. Telecom components rarely stand alone, so the session shows how easy it is to integrate telecom components with Web applications, using the Grails Web application framework as an example. Finally, it shows how the resulting converged application can be deployed on the SailFin Servlet container, a Servlet container built atop the Java™ Platform, Enterprise Edition (Java EE platform) technology-based GlassFish™ application server container."
file icon Voice-over-IP applications using open standards and open source software - a case study
A presentation made at the IIT VoIP Conference and Expo. Abstract: Over the last few years, a number of VoIP open standards aimed towards the development community have emerged. For example, the Parlay API, JAIN SLEE, the SIP Servlet API, and the media server control API all aim to help developers build VoIP and converged applications more easily. At the same time, a number of open source application servers, media servers, development tools, libraries and test tools have become available that support these standards. We believe that the availability of these standards and software have created opportunities to a large developer base who previously was prohibited from developing VoIP applications. The environment is ripe for rapid growth in new applications and service offerings, especially in the space of third-party applications and communication applications integrated with web sites. In this talk, we will discuss our experience with applying open source software to various stages of communication application projects lifecycle. The technologies include: ECharts for SIP Servlets for development, the Distributed Feature Composition Application Router for runtime application selection and composition, the SailFin SIP servlet container for deployment, the KitCAT converged applications test tool for unit and system testing. We believe that the maturity of these technologies and the gentler learning curve have lowered the barrier of entry, and should encourage a large developer base to innovate and bring new ideas in communications to fruition.
file icon Timed Transition Activation Semantics in Statecharts (2005)
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.
file icon The Rise of Telecom Development Frameworks
The presentation slides with speaker notes for a talk by Greg Bond and Eric Cheung at the IIT VoIP Conference and Expo October 28, 2009. Here is the talk abstract:

Last year we witnessed the maturation of an open standard API for VoIP applications with the final release of SIP Servlet API 1.1 which, in turn, triggered a proliferation of open source and commercial SIP servlet containers. At the same time, a number of open source projects provided development tools, libraries, test tools, and media servers that help the development and deployment of VoIP applications. Remarkably in less than one year, we see the emergence of a number of telecom development frameworks. These frameworks aim to make it even easier for web developers to integrate VoIP capability with web applications. These frameworks use development paradigms familiar to web developers, and incorporate a lot of the abovementioned software under-the-cover. The higher level abstraction offered by these frameworks significantly eases the development and maintenance of VoIP applications. In this talk, we will take a look at this exciting new trend. In particular, we will look at a number of open source frameworks including Converge, Mobicents' Seam Telco Framework, and SailFin CAFE.

file icon Structuring Grails Applications with Plugins
These are the slides from the talk that Greg gave at the Groovy/Grails Meetup in New York City entitled "Structuring Grails Applications with Plugins." This was the first public talk discussing a new IP telecom development framework called "Converge." Converge is a rapid converged application development framework that builds upon Grails (for web application development) and E4SS (for telecom app development). This talk focused on how Converge makes use of the Grails plugin architecture.
file icon SIP Application Composition - IPTComm 2007 Tutorial Presentation
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 Reusable Features for VoIP Service Realization
Telecommunication services vary greatly in their behavior. However they often can be decomposed into tightly-focused components, each designed to accomplish a certain limited function. In some cases, these functions are repeated across many services that seem quite disparate at first glance. We examine some components that have proven to be highly reusable, and demonstrate how they can be composed into a variety of interesting services. Thomas M. Smith, Proceedings of IPTComm 2010, the Conference on Principles, Systems and Applications of IP Telecommunications, Munich, Germany, Aug 2-3, 2010.
file icon Rapid Converged Telecom Application Development with E4SS, Grails and SailFin
ECharts for SIP Servlets (E4SS) is a development framework that enables rapid development of SIP protocol-based telecom applications for deployment on SIP servlet application servers like the open source SailFin server. Grails is a rapid web application development framework. This document provides a tutorial-style description of using E4SS, Grails and SailFin to implement, build and run a simple converged telecom application.
file icon KitCAT User Manual
This manual guides a user through installing KitCAT and then getting started with KitCAT test cases.
file icon KitCAT - A Framework for Converged Application Testing

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 Implementing Endpoint Services Using the SIP Servlet Standard

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 Experience with Modularity in an Advanced Teleconferencing Service Deployment
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 ECharts: From Lab to Production (2005)
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 ECharts: Balancing Design and Implementation (2002)
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 for SIP Servlets: a state-machine programming environment for VoIP applications (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.
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