VoIP/Internet Telephony![Diagram of IP telephone protocol flow.](images/voip_HowItWorks_0203v2.gif)
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Voice over Internet Protocol (VoIP) or Internet telephony is
one example of the tremendous growth of the Internet and its
applications. VoIP is a technology that allows a person to make
telephone calls using a broadband Internet connection instead
of a regular (or analog) telephone line. Some services using
VoIP may only allow you to call other people using the same service,
but others allow you to call anyone who has a telephone number
- including local, long distance, mobile, and international numbers.
Also, while some services only work using your computer or a
special VoIP phone, other services allow you to use a traditional
phone through an adaptor.
This guide is intended for those who wish to investigate VoIP
technology. It offers a broad view of the topic, and includes
such topics as security, VoIP network administration, standards
and research. Not meant to be a comprehensive bibliography, this
compilation is designed--as the name of the series implies--to
put the reader “on target.”
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Camp, Ken. IP telephony demystified. New York, McGraw-Hill,
c2003. 254 p.
TK5105.8865.C34 2003 <SciRR>
Greenblatt, David. The call heard 'round the world: Voice
over Internet Protocol and the quest for convergence. New York, AMACOM,
American Management Association, c2003. 188 p.
Bibliography: p. 173-174.
TK5105.8865.G74 2003
Grigonis, Richard. Computer telephony encyclopedia. New York,
CMP Books; Berkeley, CA, Distributed to the book trade in the
U.S. and Canada by Publishers Group West, c2000. 563 p.
TK5103.7.G753 2000 <SciRR>
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Subject headings used by the Library of Congress, under which
works on Internet telephony can be located in most card, book,
and online catalogs, include the following:
Highly Relevant
INTERNET TELEPHONY
Relevant
CONVERGENCE (TELECOMMUNICATION)
DIGITAL TELEPHONE SYSTEMS
PACKET SWITCHING (DATA TRANSMISSION)
Related
TCP/IP (COMPUTER NETWORK PROTOCOL)
TELEPHONE (PRIVATE BRANCH EXCHANGES)
TELEPHONE SYSTEMS
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Bayer, Michael. Computer telephony demystified: putting CTI,
media services, and IP telephony to work. New York, McGraw-Hill,
c2001. 765 p.
Bibliography: p. 729-730.
TK5105.8865.B39 2000 <MRC>
Black, Uyless D. Voice over IP. 2nd ed. Upper Saddle River, NJ,
Prentice Hall, c2002. 330 p.
Bibliography: p. 314-316.
TK5105.8865.B53 2002
Brown, Kevin. IP telephony unveiled. Indianapolis, IN, Cisco
Press, c2004. 170 p.
TK5105.8865.B76 2004
Davidson, Jonathan, James Peters, with contributions by Brian
Gracely. Voice over IP fundamentals. Indianapolis, IN, Cisco Press,
c2000. 373 p.
TK5105.8865.D38 2000 <SciRR>
Goralski, Walter, and Matthew C. Kolon. IP telephony. New York,
McGraw-Hill, c2000. 468 p.
TK5105.8865.G67 1999
Internet telephony. Edited by Lee W. McKnight, William Lehr,
and David D. Clark. Cambridge, MA, MIT Press, c2001. 395 p.
Bibliography: p. 367-377.
TK5105.8865.I57 2001
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Abrahams, John R., and Mauro Lollo. Centrex or PBX: the
impact of IP. Boston, Artech House, c2003. 161 p.
TK5105.8865.A27 2003
Anderson, Paul V., and Art Rosenberg. The digital call center:
gateway to technical intimacy. Houston, TX, Doyle Pub., c1999.
168 p.
HE8788.A53 1999
Bates, Juliet. Optimizing voice in ATM/IP mobile networks. New
York, McGraw-Hill, c2002. 234 p.
Bibliography: p. 225-227.
TK5105.8865.B38 2002
Caputo, Robert. Cisco packetized voice and data integration.
New York, McGraw-Hill, c2000. 334 p.
TK5105.8865.C37 2000
Collins, Daniel. Carrier grade voice over IP. 2nd ed. New York,
McGraw-Hill, c2003. 522 p.
Bibliography: p. 499-505.
TK5105.8865.C65 2003 <SciRR>
Collora, Sal, and others. Cisco CallManager best practices. Indianapolis,
IN, Cisco Press, c2004. 575 p.
TK5105.8865.C68 2004
Dang, Luan, Cullen Jennings, and David Kelly. Practical VoIP
using VOCAL. Beijing, Sebastopol, CA, O'Reilly, 2002. 502 p.
TK5105.8865.D35 2002
Deel, Darrick, Mark Nelson, and Anne Smith. Developing Cisco
IP phone services. Indianapolis, IN, Cisco Press, c2002. 259 p.
TK5105.8865.D45 2002 <MRC>
Douskalis, Bill. Putting VoIP to work: Softswitch network
design and testing. Upper Saddle River, NJ, Prentice Hall, c2002. 327
p.
Includes bibliographical references.
TK5105.8865.D69 2002
Edgar, Bob. The voiceXML handbook: understanding and building
the phone-enabled Web. New York, CMP, 2001. 481 p.
QA76.76.H94E38 2001
Evans, D. R. Digital telephony over cable. Boston, Addison-Wesley,
2001. 571 p.
Includes bibliographical references.
TK5103.7.E98 2001
Faynberg, Igor, Lawrence Gabuzda, and Hui-Lan Lu. Converged
networks and services: Internetworking IP and the PSTN. New York, Wiley,
c2000. 347 p.
Bibliography: p. 309-325.
TK5105.8865.F39 2000
Giralt, Paul, Addis Hallmark, and Anne Smith. Troubleshooting
Cisco IP telephony. Indianapolis, IN, Cisco Press, c2002. 973 p.
TK5105.8865.G57 2002
Grigonis, Richard. Voice over DSL: understanding and implementing
VoDSL. Lawrence, KS, R&D; London, McGraw-Hill, 2002. 419 p.
TK5105.8865.G75 2002
Hardy, William C. VoIP service quality: measuring and evaluating
packet-switched voice. New York, McGraw-Hill, c2003. 317 p.
Bibliography: p. 303.
TK5105.8865.H37 2003
Harler, Curt. The market for IP enhanced services: a survey
of the market and the membership of the International Engineering
Consortium: a report. Strongsville, OH, C. Harler, Inc., c2001.
1 v. (unpaged)
HE7581.H37 2001
Hersent, Olivier, Jean-Pierre Petit, and David Gurle. Beyond
VoIP protocols: understanding voice technology and networking techniques
for IP telephony. Hoboken, NJ, John Wiley, 2005. 261 p.
Includes bibliographical references.
TK5105.8865.H45 2005
Ibe, Oliver C. Converged network architectures: delivering
voice over IP, ATM, and frame relay. New York, Wiley, c2002. 344 p.
Includes bibliographical references.
TK5105.8865.I53 2002.
Keagy, Scott. Integrating voice and data networks. Indianapolis,
IN, Cisco Press, c2000. 779 p.
TK5105.8865.K43 2000
Khasnabish, Bhumip. Implementing voice over IP. Hoboken, NJ,
Wiley-Interscience, c2003. 208 p.
Includes bibliographical references.
TK5105.8865.K43 2003.
Loshin, Peter. Big book of IP telephony RFCs. San Diego, CA,
Morgan Kaufmann/Academic Press, 2001. 1 v. (various pagings)
Includes bibliographical references.
TK5105.8865.L67 2001
Lovell, David. Cisco IP telephony. Indianapolis, IN, Cisco Press,
2002. 600 p.
TK5105.8865.L68 2002
Miller, Mark. Voice over IP technologies: building the converged
network. New York, M&T Books, c2002. 528 p.
Includes bibliographical references.
TK5105.8865.M553 2002 <MRC>
Minoli, Daniel, and Emma Minoli. Delivering voice over IP
networks. 2nd ed. New York, Wiley, c2002. 491 p.
Includes bibliographical references.
TK5105.8865.M57 2002
Minoli, Daniel. Voice over MPLS: planning and designing networks.
New York, McGraw-Hill, c2002. 443 p.
Includes bibliographical references.
TK5105.8865.M5724 2002
Morgan, Brian, and Moises Gonzalez. Cisco Unity fundamentals.
Indianapolis, IN, Cisco Press, c2005. 389 p.
TK5102.5.M655 2005
Muller, Nathan J. IP convergence: the next revolution in
telecommunications. Boston, Artech House, c2000. 477 p.
Includes bibliographical references.
TK5105.8865.M85 2000 <Overflow>
Ohrtman, Frank. Softswitch: architecture for VoIP. New York,
McGraw-Hill, c2003. 359 p.
Includes bibliographical references.
TK5105.8865.O37 2003
Pulver, Jeff. The Internet telephone toolkit. New York, J. Wiley & Sons,
c1996. 201 p.
TK5105.875.I57P85 1996 <MRC>
Ransome, James F., and John W. Rittinghouse. VoIP security. Amsterdam,
Boston, Elsevier, c2005. 402 p.
Bibliography: p. 379-384.
TK5105.8865.R36 2005
Space/terrestrial mobile networks: Internet access and QoS
support.
Edited by R. E. Sheriff and others. Chichester, Eng., Hoboken,
NJ, Wiley, c2004. 273 p.
Includes bibliographical references.
TK5103.483.S73 2004
Stafford, Matthew. Signaling and switching for packet telephony.
Boston, Artech House, 2004. 253 p.
Includes bibliographical references.
TK5105.8865.S73 2004
Sulkin, Allan. PBX systems for IP telephony. New York, McGraw-Hill,
2002. 487 p.
TK5105.8865.S85 2002
Voice over IP: ripple or tidal wave? New York, Bernstein Research,
c2004. 78 p.
HE8815.V65 2004
Walker, John Q., and Jeffrey T. Hicks. Taking charge of your
VoIP project. Indianapolis, IN, Cisco Press, c2004. 294 p.
Includes bibliographical references.
TK5105.8865.W33 2004
Walters, Stephen M. The new telephony. Upper Saddle River, NJ,
Prentice Hall PTR, c2002. 371 p.
Includes bibliographical references.
TK5105.8865.W35 2002
Wright, David J. Voice over packet networks. Chichester, Eng.,
New York, John Wiley, c2001. 252 p.
Includes bibliographical references.
TK5105.8865.W75 2001
Yarberry, William. Computer telephony integration. 2nd ed. Boca
Raton, FL, Auerbach Publications, c2003. 409 p.
Bibliography: p. 275.
TK5105.8865.Y37 2003
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PROTOCOLS AND STANDARDS
Black, Uyless D. Internet telephony: call processing protocols. Upper
Saddle River, NJ, Prentice Hall, c2001. 373 p.
Bibliography: p. 360-361.
TK5105.8865.B52 2001
Camarillo, Gonzalo. SIP demystified. New York, McGraw-Hill, c2002. 264
p.
Includes bibliographical references.
TK5105.55.C35 2002
Durkin, James F. Voice enabling the data network: H.323, MGCP, SIP,
QoS, SLAs, and security. Indianapolis, IN, Cisco Press, 2003. 200 p.
TK5105.8865.D87 2003
Hersent, Olivier, Jean-Pierre Petit, and David Gurle. IP telephony:
deploying voice-over IP protocols. Chichester, Eng., Hoboken, NJ, John Wiley, 2005.
382 p.
TK5105.8865.H47 2005
Johnston, Alan B. SIP: understanding the Session Initiation Protocol.
2nd ed. Boston, Artech House, c2004. 283 p.
Includes bibliographical references.
TK5105.55.J64 2004
Kumar, Vineet, Markku Korpi, and Senthil Sengodan. IP telephony with
H.323: architectures for unified networks and integrated services. New York, Wiley,
c2001. 605 p.
Includes bibliographical references.
TK5105.8865.K86 2001
Ohrtman, Frank. Voice over 802.11. Boston, Artech House, c2004. 258 p.
Includes bibliographical references.
TK5105.5668.O34 2004
Sinnreich, Henry, and Alan B. Johnston. Internet communications using SIP:
delivering VoIP and multimedia services with Session Initiation Protocol.
New York, Wiley Computer Pub., c2001. 298 p.
Includes bibliographical references
TK5105.55.S56 2001
Voice over IP (VoIP) technology: 21 August 2001, Denver, USA. Petros Mouchtaris,
chair/editor; sponsored ... by SPIE–the International Society for
Optical Engineering; cooperating organization, Colorado Photonics Industry
Association (USA). Bellingham, WA, SPIE, c2001. 180 p. (SPIE proceedings
series, v. 4522)
Includes bibliographical references
TK5105.8865.V65 2001
LAW AND LEGISLATION
Molczan, George. A legal and law enforcement guide to telephony: addressing
technical, legal and police issues relating to the interface and
interaction with communication service providers. Springfield, IL, C. C. Thomas, c2005.
170 p.
HE8815.M65 2005
United States. Congress. House. Committee on Energy and Commerce. Subcommittee
on Telecommunications and the Internet. VOIP services: will the technology
disrupt the industry or will regulation disrupt the technology?:
hearing before the Subcommittee on Telecommunications and the Internet of
the Committee
on Energy and Commerce, House of Representatives, One Hundred Eighth
Congress, second session, July 7, 2004. Washington, U.S. G.P.O., 2004. 161 p.
Includes bibliographical references.
Also available via Internet from the GPO Access web site. Address as of 1/6/05:
http://purl.access.gpo.gov/GPO/LPS56858; current access available via PURL.
KF27.E555 2004j
United States. Congress. House. Committee on the Judiciary. Subcommittee
on Commercial and Administrative Law. Regulatory aspects of Voice over
Internet Protocol (VoIP): hearing before the Subcommittee on Commercial
and Administrative
Law of the Committee on the Judiciary, House of Representatives,
One Hundred Eighth Congress, second session, July 23, 2004. Washington, U.S. G.P.O.,
2004. 129 p.
Includes bibliographical references.
Also available via Internet from the GPO Access web site. Address as of 11/4/04:
http://purl.access.gpo.gov/GPO/LPS55363; current access is available via PURL
KF27.J856 2004d
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TECHNICAL REPORTS and other types of literature are indexed in
the following guides:
Government Reports Announcements & Index (1946-1996)
Z7916.G78 <SciRR A&I> and Computer format
Monthly Catalog of United States Government Publications (1895-
)
Z1223.A18 <SciRR A&I> and Computer format
National Technical Information Service (NTIS)
Computer format
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Reports listed below are available in the microform collection
of the Science, Technology & Business Division. These and other
reports on the subject may also be purchased from the National Technical
Information Service (NTIS), 5825 Port Royal Road, Springfield, Virginia
22161. NTIS telephone: (703) 605-6585. NTIS web site: http://www.ntis.gov.
Barck-Hoist, S., H. Christiansson, and A. Vidstroem. Ip-telefoni
ur ett sarbarhetsperspektiv (A vulnerability perspective on VoIP). Stockholm,
Sweden, Foersvarets Forskningsanstalt,. Div. of Defence Analysis, Jan.
2005. 44 p.
PB2005109492
Kuhn, D. R. PBX vulnerability analysis: finding holes in your PBX
before someone else does. Gaithersburg, MD, Computer Security Div., National
Inst. of Standards and Technology, 2001. 66 p. (NIST SP 800-24)
PB2000108580
http://csrc.nist.gov/publications/nistpubs/800-24/sp800-24pbx.pdf
Kuhn, R., T. J. Walsh, and S. Fries. Security considerations for
Voice Over IP systems. Recommendations of the National Institute of
Standards
and Technology. Gaithersburg, MD, Computer Security Div., National Inst.
of Standards and Technology, 2005. 99 p. (NIST SP 800-58)
PB2005103389
http://csrc.nist.gov/publications/nistpubs/800-58/SP800-58-final.pdf
Tasyumruk, L. Analysis of voice quality problems of Voice Over
Internet Protocol (VoIP). Monterey, CA, Naval Postgraduate School, Sept. 2003.
95 p. ADA418298
Zahorujko, I., A. Reynolds, and B. Blair. IP convergence in global
telecommunications. Voice Over Internet Protocol (VolP). Salisbury, Australia,
Electronics and Surveillance Research, Defence Science and Technology
Organisation, 2000. 39 p.
ADA392641
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Abstracting and Indexing Services that index relevant
journal articles and other literature on Voice over Internet Protocol
are listed below. Note: Consult a reference librarian for location
and format of abstracting and indexing services in the Science Reading
Room. The following indexes are available in most public and college
libraries:
Applied Science & Technology Index (1913- )
Z7913.I7 <SciRR A&I> and Computer format
Engineering Index/EI Compendex (1884 - )
Z5851.E62 <SciRR A&I> and Computer format
INSPEC
Computer format
Online in LC: Web of Knowledge
Reader’s Guide to Periodical Literature (1900- )
AI3.R48 <BRS>, <N&CPR> and Computer format
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Journals that often contain articles relevant to green roofs include
the following:
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Adams, Eric. Talk becomes cheap. Popular science, v. 256,
Aug. 2004: 75-76.
AP2.P8
Awoniyi, Olufunmilola, and Fouad A. Tobagi. Effect of fading
on the performance of VoIP in IEEE 802.11a WLANs. ICC 2004 - IEEE
International Conference on Communications, v. 6, 2004: 3712-3717.
TK5101.A1I16a
Bahati, Raphael M., and Michael A. Bauer. Quality of service
provisioning for VoIP applications with policy-enabled differentiated
services. NOMS 2004 - IEEE/IFIP Network Operations and Management
Symposium, Apr. 2004: 335-348.
TK5101.A1I165a
Cannon, Robert. State regulatory approaches to VoIP: policy,
implementation, and outcome. Federal communications law journal,
v. 57, May 2005: 479-510.
K6.E29
http://www.law.indiana.edu/fclj/pubs/v57/no3/Cannon.pdf
Choi, Young-June and Saewoong Bahk. Scheduling for VoIP service
in cdma2000 1x EV-DO. ICC 2004 - IEEE International Conference
on Communications, v. 3, 2004: 1495-1499.
TK5101.A1I16a
Das, Sajal K., and others. Performance optimization of VoIP calls
over wireless links using H.323 protocol. IEEE transactions
on computers, v. 52, June 2003: 742-752.
TK7885.A1I2
Davis, Nicole. Zero cents a minute. Popular science, v. 264,
Feb. 2004: 40.
AP2.P8
Ezaki, Takashi, Hirotada Kawakami, and Koichi Asatani. A new
VoIP call admission control scheme with use of alternate routing
for low call loss probability. ICC 2004 - IEEE International
Conference on Communications, v. 4, 2004: 2209-2214.
TK5101.A1I16a
Fox, Barry. The end of phones as we know them. New scientist,
v. 182, June 26, 2004: 22-23.
Q1.N52
Garg, Sachin, and Martin Kappes. Admission control for VoIP traffic
in IEEE 802.11 networks. GLOBECOM 2003 - IEEE Gobal Telecommunications
Conference, v. 6, 2003: 3514-3518.
TK5101.A1I145a
Hao, Ruibing, and others. Integrated system interoperability
testing with applications to VoIP. IEEE/ACM transactions on
networking,
v. 12, Oct. 2004: 823-836.
TK5105.5.I3
Khamsi, Roxanne. Skype beyond the hype. Technology review, v.
107, June 2004: 44-47.
T171.M47
Markopoulou, Athina P., Fouad A. Tobagi, and Mansour J. Karam.
Assessment of VoIP quality over internet backbones. IEEE INFOCOM
2002 - the Conference on Computer Communications, v. 1, 2002: 150-159.
TK5105.5.I32a
Mase, Kenichi, and Hisato Kobayashi. An efficient end-to-end
measurement based admission control for VoIP networks. ICC
2004 - IEEE International Conference on Communications, v. 4, 2004:
1877-1881.
TK5101.A1I6a
Shacklett, Mary E. Signal vs. noise: is VoIP security a risky
proposition? VoIP magazine, v. 1, Oct. 2005: 17-20.
http://www.voip-magazine.com/print/archive/
Swope, Christopher. Brave new telecom world. Internet telephone communication
is an exciting new prospect. Unless it’s your job to regulate it. Governing,
v. 18, Apr. 2005: 22-26.
JK2403.G68
Takahashi, Akira, Hideaki Yoshino, and Nobuhiko Kitawaki. Perceptual QoS assessment
technologies for VoIP. IEEE communications magazine, v. 42, July 2004: 28-34.
TK5101.A1I13a
Yu, Jeonggyun, Sunghyun Choi, and Jaehwan Lee. Enhancement of
VoIP over IEEE 802.11 WLAN via dual queue strategy. ICC 2004
- IEEE International Conference on Communications, v. 6, 2004: 3706-3711.
TK5101.A1I16a
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Selected Materials available in the Science Reading Room pamphlet
box(es) include:
Ding, Lijing, and Rafik A. Goubran. Speech quality prediction
in VoIP using the extended E-model. GLOBECOM 2003 - IEEE Global
Telecommunications Conference, v. 7, 2003: 3974-3978.
Garg, Sachin, and Martin Kappes. Can I add a VoIP call? ICC
2003 - IEEE International Conference on Communications, v. 2, May 2003:
779-783.
Garg, Sachin, and Martin Kappes. An experimental study of throughput
for UDP and VoIP traffic in IEEE 802.11b networks. WCNC 2003
- IEEE Wireless Communications and Networking Conference, Mar. 2003:
1748-1753.
http://www.cse.iitb.ac.in/~varsha/allpapers/wireless/wcnc2003/udp-voip802.11b.pdf
James, J. H., Bing Chen, and Laurie Garrison. Implementing VoIP:
a voice transmission performance progress report. IEEE communications
magazine, v. 42, July 2004: 36-41.
Kong, Xiang, and Kenichi Mase. Dynamic routing with endpoint
admission control for VoIP networks. ICC 2003 - IEEE International
Conference on Communications, v. 3, May 2003: 1728-1732.
Kwon, Ted T., and others. Mobility management for VoIP service:
Mobile IP vs. SIP. IEEE wireless communications, v. 9, Oct. 2002:
66-75.
Mase, Kenichi. Toward scalable admission control for VoIP networks. IEEE
communications magazine, v. 42, July 2004: 42-47.
Oouchi, Hiroyuki, and others. Study on appropriate voice data
length of IP packets for VoIP network adjustment. GLOBECOM
2002 - IEEE Global Telecommunications Conference, v. 2, Nov. 2002: 1618-1622.
Qiao, Zizhi, and others. A new method for VoIP quality of service
control use combined adaptive sender rate and priority marking.
ICC 2004 - IEEE International Conference on Communications, v.
6, 2004: 1473-1477.
Sun, Lingfen, and Emmanuel Ifeachor. New models for perceived
voice quality prediction and their applications in playout buffer
optimization for VoIP networks. ICC 2004 - IEEE International
Conference on Communications, v. 6, 2004: 1478-1483.
Yonatan, Levy, and others. VoIP reliability: A service provider's
perspective. IEEE communications magazine, v. 42, July 2004: 48-54.
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About.com -- VoIP
http://onlinebusiness.about.com/index.htm?once=true&
About.com guide to telecommunications provides information about VoIP along with
news, research and developments.
Federal Communications Commission -- VOIP
http://www.fcc.gov/voip/
The site has a FAQ on VOIP, a VOIP forum and VOIP consumer factsheet.
How Stuff Works -- How VOIP works
http://electronics.howstuffworks.com/ip-telephony.htm/printable
Internet Telephony Magazine
http://www.tmcnet.com/voip/
Covering the latest news and featuring original articles on Voice over IP products
and services. Features in-house product testing and reviews.
IP xStream
http://www.iptelephony.org/cgi-bin/Site/Pages.pl?Selection=HomePage
IPxStream offers market intelligence and news centered around the IP telephony/fax
industry and related technologies.
IT Papers -- Voice over IP
http://www.itpapers.com/cgi/PSummaryIT.pl?paperid=8069&scid=6
This technology guide examines recent advances in the infrastructures, equipment,
and embedded systems that are needed to successfully enable VoIP and discusses
the major issues currently facing product developers.
Network World Fusion -- Voice over IP Research
http://www.networkworld.com/research/voip.html
Get the lowdown on VoIP technology with white papers, tutorials and other resources
from Network World Fusion.
Protocols.com -- VOIP Reference page
http://www.protocols.com/pbook/VoIP.htm
Pulver.com
http://www.pulver.com/
The site offers job listings, original research reports,
events and news pertaining to VoIP.
Search Networking -- What is VoIP?
http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci214148,00.html
Learn the basics of VoIP with this brief entry in the TechTarget encyclopedia.
Sounding Board Magazine
http://www.soundingboardmag.com/
Sounding Board Magazine is a publication geared to those in the IP communications
field. The companion Web site offers archives of past issues and current features
free of charge.
Telecommunications Reports International-- VoIP Policy Report
http://www.tr.com/iesearch.asp
(Weekly e-mail service)
VOIP News
http://www.voip-news.com/
See especially its list of VoIP Trade Shows Conferences and Expositions at
http://www.voip-news.com/9/trade.html
VOIP Watch
http://www.voipwatch.com/
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