Abstract We describe the architecture and implementation of our Internet telephony system CINEMA(Columbia InterNet Extensible Multimedia Architecture, intended to replace the departmental PBX (telephone switch). It interworks with the traditional telephone networks via PSTN/IPgateways. It also serves as a corporate or campus infrastructure for existing and future services like web, email, video and streaming media. Initially intended for a few users, it will eventuallyreplace the plain old telephones from our offices, due to the cost benefits and new services it offers. We also discuss common inter-operability problems between the PBX and the gateway.This paper is intended as a design document of the overall system.

We describe the architecture and implementation of our Internet telephony test-bed intended to replace the departmental PBX (telephone switch). It interworks with the traditional telephone networks via a PSTN/IP gateway. It also serves as a corporate or campus infrastructure for existing and future services like web, email, video and streaming media. Initially intended for a few users, it will eventually replace the plain old telephones from our offices, due to the cost benefit and new services it offers. We also discuss common inter-operability problems between the PBX and the gateway.

interactive voice response applications that are accessible from telephones as well as IP phones. We also describe how we have used sipvxml in our multi-party multimedia conferencing server. We propose other applications and extensions that can benefit from this technology in our IP telephony test bed. (keywords: Internet telephony; interactive voice response; SIP; VoiceXML; sipvxml) I.

The ECLIPSE project shows how concerns related to the complex behavior of telecommunication systems can be separated from concerns related to the IP implementation of that behavior. Within this context, the behavioral problems of Location and Identification, Switching and Spontaneous Conferencing, and Mail are addressed. Each of these features is challenging because it is not clear which functions should be included within its boundary, because it encompasses many possible behavioral variations and conflicting requirements, because it interacts with many other features, and because (like all features) it must be extensible. For each feature, the paper proposes a boundary and presents an architecture for performing all the functions within the boundary, with all their behavioral variations. The paper also shows how the composition of these feature architectures is extensible and reveals potential feature interactions. Bad feature interactions can be prevented, and good feature interactions preserved, by minor adjustments to the feature composition.

We describe the architecture and implementation of our comprehensive multi-platform collaboration framework known as Columbia InterNet Extensible Multimedia Architecture (CINEMA). It provides a distributed architecture for collaboration using synchronous communications like multimedia conferencing, instant messaging, shared web-browsing, and asynchronous communications like discussion forums, shared files, voice and video mails. It allows seamless integration with various communication means like telephones, IP phones, web and electronic mail. In addition, it provides value-added services such as call handling based on location information and presence status. The paper discusses the media services needed for collaborative environment, the components provided by CINEMA and the interaction among those components.

I HEREBY CERTIFY THAT THE WORK REPORTED IN THIS THESIS IS MY OWN AND THAT WORK PERFORMED BY OTHERS IS APPROPRIATELY CITED. SIGNATURE OF THE AUTHOR: ICH VERSICHERE HIERMIT WAHRHEITSGEMÄSS, DIE ARBEIT BIS AUF DIE DEM

integrate Internet telephony services with an existing