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file icon Rapid Converged Telecom Application Development with E4SS, Grails and SailFin
16.07.2008
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 Reusable Features for VoIP Service Realization
02.08.2010
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 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 Structuring Grails Applications with Plugins
11.05.2009
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 The Rise of Telecom Development Frameworks
28.10.2009
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 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.
file icon Voice-over-IP applications using open standards and open source software - a case study
29.10.2008
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 Web 2.0 Phone Home: Rapid Development of Telecom-Enabled Web Applications
08.06.2009
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."
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