Principles, Systems and Applications of IP
Telecommunications
July
19,20 2007
Columbia University
New
York City
Tutorials
The first day of the
conference (July 19)
features the following two tutorials.
IMS vs. P2P and Web 2.0 - Understanding
the Role of the IP Multimedia System (IMS) in
face of a converging telco and internet service
world
Presented by Prof. Dr. Thomas Magedanz, TU Berlin /
Fraunhofer FOKUS, Germany
This tutorial will introduce the notion of network
convergence and Next Generation Networks by looking at
the evolution of telecommunication services and internet
services and the related infrastructure.
Special emphasis will be placed on describing the
principles and architecture of the IP Multimedia
Subsystem (IMS), a common service platform standard
defined by IETF, 3GPP, ETSI TISPAN, and Cablelab, which
is based on internet protocols and intelligent network
principles. Besides the IMS core operation also the IMS
application provisioning principles will be illustrated.
It will be shown tha IMS is well designed to support
seamless presence and community oriented multimedia
information and communication services across various
networks. However, a critical comparison of IMS with
classic VoIP infrastructures, P2P service platforms and
the emerging Web 2.0 will be performed. The tutorial
ends with an introduction of the Fraunhofer FOKUS Open
IMS Playground - a globally known pioneering IMS testbed,
and the corresponding open source IMS core system, which
has been released in 2006 and since then provides the
foundation for many academic and industry NGN/IMS
testbeds around the globe. More information can be found
at www.fokus.fraunhofer.de/ims.
A Standards Based Software Environment for Providing SIP
Application Composition
Presented by K. Hal Purdy and Eric Cheung, AT&T
Labs - Research, USA
A challenge in any telecommunications system is providing
a structured environment where multiple applications may
exercise advanced call control simultaneously within a
given communications episode in such a way that the
overall system behavior is correct and pleasing to the
participants. The architectural issues associated with
supporting application composition and interoperability
in an VoIP (SIP) environment have lately started to
receive renewed focus in the industry. Distributed
Feature Composition (DFC) is an architecture for
providing such a structured software environment for
application composition in a general telecommunications
system. For the past two years, we have applied DFC
principles to the SIP Servlet programming environment, a
Java API standard specified in the Java Community Process
(JCP), so that the SIP Servlet environment would support
flexible and coherent application composition within and
across SIP application servers. In this tutorial, we will
provide a brief overview of the DFC architecture,
describe the deficiencies and ambiguities of the current
SIP Servlet specification (JSR 116) as regards
application composition, and go into detail about the
application composition architecture now proposed in the
JCP expert group (JSR289) that is nearing completion as
the new 1.1 version of the SIP Servlet API
specification.