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VoIP/Internet TelephonyDiagram of IP telephone  protocol flow.

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SCOPE

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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INTRODUCTIONS TO THE TOPIC

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

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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BASIC TEXTS

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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ADDITIONAL TITLES

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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SPECIALIZED TITLES

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

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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SELECTED TECHNICAL REPORTS

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

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

Journals that often contain articles relevant to green roofs include the following:

IEEE communications magazine TK5101.A1I13a
Internet telephony TK5105.8865.I58
Mobile media: MM HE9713.M66
Sounding board: tracking the movement of voice, fax & video onto packet networks
http://www.soundingboardmag.com/
TK5105.8865.S64
VoIP magazine
http://www.voip-magazine.com/print/archive/
 

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REPRESENTATIVE JOURNAL ARTICLES

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

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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ADDITIONAL SOURCES OF INFORMATION

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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