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<TH align=middle colSpan=3>3.4. Scenario 3: Integration of VoIP and
Videoconferencing</TH></TR>
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<TH align=middle width="60%">Chapter 3. IP Telephony
Scenarios</TH>
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<DIV>
<H2 class=title style="CLEAR: both"><A id=d0e2338>3.4. Scenario 3:
Integration of VoIP and Videoconferencing</H2></DIV></DIV>
<DIV></DIV>
<P>When referring to VoIP and IP telephony the main focus is on voice services,
which may be misleading regarding the support of video. IP telephony standards
(see <A title="Chapter 2. Technology Background"
href="http://www.informatik.uni-bremen.de/~prelle/terena/cookbook/main/ch02.html">Chapter
2</A>) do have the capabilities of signaling and are able to initiate multimedia
communications. This scenario details how voice over IP technologies / standards
and videoconferencing solutions may be seamlessly integrated. The goal is to
provide the users with a global architecture derived from IP telephony
standards, giving videoconferencing systems the chance of becoming widely used
and adopted. Videoconferencing systems have the purpose of facilitating meetins
of remote participants, and to support the illusion that they are all sharing
the same space and communicating as if they were in the same room. Perfect
videoconferencing sessions are achieved when the technology is no longer
noticeable. Even though the perceived quality of video and audio plays the most
important role, there are a number of other factors influencing the perception
of successful videoconferencing:</P>
<DIV class=itemizedlist>
<UL type=disc>
<LI>accessibility of the system, the system should be accessible on a broad
area giving users the easiest way of communicating without worrying on how to
join a conference or how to find reachability information on the party to
call;
<LI>value-added services, such as data/application sharing and voice mail, are
only two examples of value-added services which are not feasible with classic
telephony systems, yet may improve the quality experienced by the user;
<LI>interoperability among different technologies: the system should be
transparent to different technologies in order to give the users the chance of
having seamless connectivity.</LI></UL></DIV>
<P>In order to describe the possible integration scenario of VoIP and
Videoconferencing we need to examine which are the possible applications related
to the Videoconferencing scenario. Basic use of videoconferencing systems
relates to meetings (special cases of meetings are classroom and collaboration
meetings); more specific applications may be developed on top of the basic
functionality, with enanched options. Here we cite a set of the most significant
applications:</P>
<DIV class=itemizedlist>
<UL type=disc>
<LI><SPAN class=emphasis><EM>Telecommuting</EM></SPAN> - Telecommuting is a
broad term referring to corporate employees who interact electronically with
corporate resources and people. Extensions of the term refer to the individual
interaction and collaboration that takes place between home-based consultants
and inter-company business partners.
<LI><SPAN class=emphasis><EM>Telemedicine</EM></SPAN> - Videoconferencing
solutions delivering high-quality video images to remote medical specialists.
Specialized videoconferencing devices may be required to enable high-quality
video contents not available with the standard videoconferencing systems.
<LI><SPAN class=emphasis><EM>Distance Learning</EM></SPAN> - Video lectures,
remote guest speakers invitation to a classroom and private lessons to groups
of students located in different locations are some of the educational
processes requiring the use of videoconferencing tools.
<LI><SPAN class=emphasis><EM>Customer Services</EM></SPAN> -
Videoconferencing-based customer services enable call center operators to be
more effective while interacting with customers.
<LI><SPAN class=emphasis><EM>Justice services</EM></SPAN> - Many legal systems
introduce the use of videoconferencing to enable police officers to attend
legal proceedings. This optimizes the time police need to spend in
courthouses.
<LI><SPAN class=emphasis><EM>Virtual/Remote Laboratories</EM></SPAN> - Remote
laboratories allow researchers to share advanced appliances using existing
network infrastructure. In the Telemedicine, specialized devices may be
required to enable high-quality video contents (not available with the
standard videoconferencing systems) to be transmitted; moreover, special
considerations apply when such interaction modes are considered.</LI></UL></DIV>
<P>A successful integration scenario would require, on the application side,
application specific devices (for basic meetings, simple desktop conferencing
equipment may be enough) to deliver the content to the end-user and, on the
technical side, servers (to build a global architecture accessible by all group
users), gateways (to provide interoperability with different access technologies
and different IP telephony protocols), conference bridges and multipoint
conferencing units (to provide capabilities for multipoint conferencing).</P>
<DIV class=sect2 lang=en>
<DIV class=titlepage>
<DIV>
<DIV>
<H3 class=title><A id=d0e2391>3.4.1. Integrating Voice and
Videoconferencing over IP - an example</H3></DIV></DIV>
<DIV></DIV>
<P>In order to give the reader an understanding of a complex scenario, such as
the integration of voice and videoconferencing over IP, we describe here an
example actually implemented at the SURFnet offices in The Netherlands. An
integrated voice and video environment is a setup based on H.323 components
(endpoints, MCU and gateway), a Cisco CallManager (using the Skinny protocol),
and a PBX. Therefore this is also an example of scenario 2b (Integration with
legacy PBX systems). <A
title="Figure 3.8. Integrated Voice and Video over IP architecture at SURFnet offices"
href="http://www.informatik.uni-bremen.de/~prelle/terena/cookbook/main/ch03s04.html#vvoip">Figure 3.8</A>
gives an overview of the components and how they are connected.</P>
<DIV class=figure><A id=vvoip>
<P class=title><B>Figure 3.8. Integrated Voice and Video over IP
architecture at SURFnet offices</B></P>
<DIV class=mediaobject align=center><IMG
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