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Topic: Voice over IP

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In the News (Sat 16 Feb 19)

  Configuring Voice over IP   (Site not responding. Last check: 2007-10-12)
Voice over IP is primarily a software feature; however, to use this feature on a Cisco 3600 series router, you must install a voice network module (VNM).
Establishing communication using Voice over IP is similar to configuring an IP static route: you are establishing a specific voice connection between two defined endpoints.
Voice over IP can be used with Microsoft NetMeeting (Version 2.x) when the Cisco 3600 or Cisco 2600 series router is used as the voice gateway.
www.cisco.com /univercd/cc/td/doc/product/software/ios120/12cgcr/voice_c/vcprt1/vcvoip.htm   (7806 words)

 Voice over IP – 3Com
Voice over IP has proven already, and will prove in the future even more forcefully, that it is an exceptionally effective way for people to communicate.
Voice over IP is a packet technology allowing the analog waves of our spoken words to be converted to digital signals and then packetized.
The voice over IP devices (phones, gateways, or computers) are intelligent because they have an IP address, send and receive packets, and, in many designs, can include data services such as global directory, network time, local weather reports, news streaming and the like.
www.3com.com /voip/voice-over-ip.html   (398 words)

 Voice Over IP   (Site not responding. Last check: 2007-10-12)
Voice over IP technology will enable the VCCS to implement voice services using the local college infrastructure and establish voice communications over Net.Work.Va with other locations in Virginia that have a VoIP capable infrastructure and a connection to Net.Work.Va.
The IP Gateway component defined for Phase II of the Voice over IP implementation performs the same functions and has the same connections as the IP Gateway device defined in Phase I. The Call Processor Manager component and the IP Gateway component in Phase II perform similar functions, but for different environments.
The success of any Voice over IP implementation requires that a comprehensive dial plan be developed before as part of the overall planning.
www.so.vccs.edu /its/models/VoIP_model.htm   (1825 words)

 Howstuffworks "How VoIP Works"
VoIP, or Voice over Internet Protocol, is a method for taking analog audio signals, like the kind you hear when you talk on the phone, and turning them into digital data that can be transmitted over the Internet.
IP phones connect directly to your router and have all the hardware and software necessary right onboard to handle the IP call.
Since the IP phones or ATAs broadcast their info over the Internet, they can be administered by the provider anywhere there is a connection.
computer.howstuffworks.com /ip-telephony.htm   (1220 words)

 Voice Over IP   (Site not responding. Last check: 2007-10-12)
Voice over IP (VOIP)communication first received wide attention in the late 1990's due to its potential to save costs over traditional voice communication and simplify IT management, merging voice and data systems.
IP is a standard for data transmission for closed groups (an office for example), Wide Area Networks (WANs) or intranets, and the Internet.
IP is an efficient way for transmitting data, allowing data heading to various destinations to share bandwidth.
www.techsoup.org /howto/articles/internet/page3253.cfm   (1092 words)

 Voice over IP - Wikipedia, the free encyclopedia
Protocols which are used to carry voice signals over the IP network are commonly referred to as Voice over IP or VoIP protocols.
The receiving node must restructure IP packets that may be out of order, delayed or missing, while ensuring that the audio stream maintains a proper time consistency.
However in backbone voice networks where everything is under the control of the network operator or telco, H.323 is the protocol of choice.
en.wikipedia.org /wiki/Voice_over_IP   (4676 words)

 Configuring Voice over IP for the Cisco 3600 Series
Voice over IP (VoIP) enables a Cisco 3600 series router to carry voice traffic (for example, telephone calls and faxes) over an IP network.
Voice over IP can be configured to recognize extension numbers and expand them into their full E.164 dialed number by using two commands in tandem: destination-pattern and num-exp.
Voice over IP can be used with Microsoft NetMeeting (Version 2.x) when the Cisco 3600 series router is used as the voice gateway.
www.cisco.com /univercd/cc/td/doc/product/software/ios113ed/113t/113t_1/voip/config.htm   (9781 words)

 Riverstone Networks - Voice over IP   (Site not responding. Last check: 2007-10-12)
For the traditional telecommunications carriers, wireline voice services are a mature market that will continue to generate most of their revenues, in spite of gradually shrinking prices and margins.
Voice over Cable is a broad area, and the cable operator may choose to implement a number of different solutions or to develop partnerships with other complementary carriers.
QoS functionality in the IP aggregation and backbone networks must be compatible with the Cable QoS mechanism and provide similar guarantees for expedited delivery of voice packets.
www.riverstonenet.com /solutions/cable_voice_over_ip.shtml   (721 words)

 Voice Over IP - VoIP Services   (Site not responding. Last check: 2007-10-12)
Voice over IP (VoIP) refers to voice transmission (or to put it simply, telephone calls) sent over Internet Protocol (IP) based data networks.
Voice information is sent in digital form in discrete packets rather than in the traditional circuit-committed protocols of the public switched telephone network (PSTN).
For example, voice messages can be prepared using a telephone and then delivered to an integrated voice/data mailbox using Internet or intranet services.
www.softrim.com /voice_over_ip.asp   (197 words)

 VoIP/Voice over IP: Voice over Ip
The IP host has a direct connection to either the destination telephone number or a private branch exchange (PBX) that is responsible for completing the call to the configured destination pattern.
Jitter is the variation between the time a voice packet is expected to be received and when it actually is received, causing discontinuity in the real-time voice stream.
Voice devices such as the Cisco 3600, Cisco MC3810, and the Catalyst 4224 compensate for jitter by setting up a playout buffer to play back voice in a smooth fashion.
www.experts-exchange.com /Networking/VoIP_Voice_over_IP/Q_20998388.html   (1959 words)

 Voice over IP
NetDIVE's Voice over IP (VoIP) technology is integrated into all our software systems for enabling Voice communication/chat of highest qualuty.
Voice over IP of NetDIVE products will enable you, your employees and/or your customers to engage in the highest quality Voice communication on a worldwide basis.
NetDIVE's Voice over IP technology results in a voice quality that is as good as, if not better*, than the Voice quality of a typical mobile telephone, even on an Internet connection of as low as 33.8 Kbit/Sec.
www.netdive.com /htms/misc/voip.htm   (324 words)

 VoIP and Voice over IP, VoIP Applcations - AudioCodes
VoIP and Voice over IP, VoIP Applcations - AudioCodes
AudioCodes offers its partners and customers a diverse range of flexible, comprehensive voice over packet media gateway and media processing technologies and systems, leading the transition to converged voice and data communications networks in the wireline, wireless, broadband access and enhanced voice services markets.
Ranging from voice over packet processors, modules, and boards to entire media gateway systems, in the wireline, wireless, broadband access and enhanced voice services markets, AudioCodes is indeed a one-stop shop.
www.audiocodes.com /Content.aspx?voip=315   (392 words)

 EHS Company - - Primer: Voice-over-IP Across the Enterprise Network -
H.323 defines a variety of node types, the most common of which are identical to those in today's typical voice networks: terminals for the desktop, gateways for bridging the packet network to a standard telephone network, and gatekeepers that set up calls and provide other administrative services to the various devices.
On a full-duplex voice circuit, a single 64-Kbps feed suffices, but on a packet-switched network such as IP, 128 Kbps of cumulative data is required if two users are speaking simultaneously.
Given their familiarity with voice networks, expect their solutions to carry more voice-specific features, though these features may have to be used with these vendors' PBXs as well.
www.ehsco.com /reading/19981001ncf1.html   (4363 words)

 Avaya IP Office, Avaya Phone Systems, IP Office, Orange County, Los Angeles, San Diego   (Site not responding. Last check: 2007-10-12)
When acting as an IP telephony server, IP Office supports cost effective standards-based IP telephony (H323), quality of service (QoS) through DiffServ (for routing), 802.1p (when used in conjunction with a Cajun® local area network [LAN] switch), and remote locations connected via Frame Relay or VPN.
Voice calls can be allocated dynamically and can -bump- a multi-channel data transmission from one of its channels as needed to help ensure priority voice calls get through.
A: Multiple Avaya IP Office systems can be linked together using a standard data network, providing limited feature transparency and advanced applications such as centralized voice mail and call center.
www.tekcetera.com /voip.htm   (745 words)

 ICMI/Call Center Magazine Network   (Site not responding. Last check: 2007-10-12)
You will recall that voice is analog in its native form and that the PSTN also was entirely analog for the first 75 years or so.
To support voice in its native analog form over a digital network, the analog signal has to be coded (i.e., converted) into a digital format at some point after leaving your lips and prior to entering the WAN.
The theorem (paraphrased) states that, in order to convert analog voice to a digital format, send it over a digital circuit, and reproduce high-quality analog voice at the receiving end, one must sample the amplitude of the analog sine wave at twice the highest frequency on the line.
www.commweb.com /article/COM20010709S0016   (2354 words)

 Voice Over IP Software (VoIP Software) - GAO Research
Detection of a voice, fax, or data call so that it can be switched to the appropriate functional module.
T38 fax over IP software allows the transfer of facsimile documents in real-time between two standard Group3 facsimile (G3 fax) terminals over the Internet or other networks using IP protocols.
IP telephony commonly takes as little as one-twelfth the bandwidth of the Plain Old Telephone Service (POTS) to transmit conversations.
www.gaoresearch.com /products/voip/voip.php   (753 words)

 Amazon.com: Voice Over IP: Books: Uyless D. Black,Uyless Black   (Site not responding. Last check: 2007-10-12)
On the positive side, Voice Over IP is chock-full of terrific tables and charts that illustrate network topologies and the different elements of protocols involved in transmitting voice traffic over an IP network.
I have implemented several voice over IP systems, and I find Uyless' book to be an excellent technical reference.
This is the fourth voice over IP book I have read and if you took all four together you may get a half decent.
www.amazon.com /Voice-Over-Uyless-D-Black/dp/0130224634   (1666 words)

 Voice Over IP and VOIP Protocols For Internet Telephony
In a VOIP enabled network, the voice signal is digitized, compressed and converted to IP packets and then transmitted over the IP network.
The key benefits of Internet telephony (voice over IP) are the very low cost, the integration of data, voice and video on one network, the new services created on the converged network and simplified management of end user and terminals.
For voice communications over IP to become acceptable to the users, the packet delay and getter needs to be less than a threshold value.
www.networkdictionary.com /protocols/voip.php   (859 words)

 Voice Over IP   (Site not responding. Last check: 2007-10-12)
Voice Over IP Written by Derek Mitchell [author's bio] [read 29486 times]
Several times over the last few years the static has gotten unbearable - said phenomenon being followed up by an unhelpful visit from the telco repairmen.
In essence voice traffic can be prioritized over any other internet traffic that may interfere with your call quality.
www.devbuzz.com /content/vonage_voice_over_ip_pg1.asp   (1724 words)

 Why Voice-Over-IP?
Over 40% of businesses with more than 500 employees have begun to implement converged networks.
Exciting developments in the near future include IP Telephones with color displays and built in video cameras.
With their large display screens, many IP telephones can be used to exchange targeted information through custom XML applications.
www.totalcomm.com /total/voipwhy.html   (292 words)

 Voice Over IP Software (V2 over IP Stacks Software) - GAO Research   (Site not responding. Last check: 2007-10-12)
GAO offers a complete suite of high performance, field-proven and versatile Voice and Video over IP (V2 over IP) protocol stacks, which enable the communication of network elements and network interoperability.
GAO's V2 over IP technology enables network equipment and consumer product manufacturers to rapidly bring to market interoperable standards compliant V2 over IP products with high QoS.
GAO leads the market with products and technologies that enable enterprises and consumers to migrate their voice and video communications from traditional telephone networks to next generation packet networks.
www.gaoresearch.com /products/v2_over_ip_stacks/v2_over_ip_stacks.php   (637 words)

 Voice-Over-Internet Protocol
Voice over Internet Protocol (VoIP), is a technology that allows you to make telephone calls using a broadband Internet connection instead of a regular (or analog) phone line.
Also, while some services only work over your computer or a special VoIP phone, other services allow you to use a traditional phone through an adaptor.
You can hook up an inexpensive microphone to your computer and send your voice through a cable modem or connect a phone directly to a telephone adaptor.
www.fcc.gov /voip   (1129 words)

 Voice over IP: Security, stability, success: ZDNet Australia: Reviews: Hardware: Peripherals
Voice over Internet Protocol (VoIP) technologies have been with us for quite some time now, which means the hardware and software have had time to be developed and most of the bugs ironed out.
Other benefits include internal management of the company telephony system, more accurate call logging/management, voice mail, integration with existing directory services, and the ability to manage the phone system using the organisation's data network systems policies and procedures.
Over the next weeks you'll see and hear what CIOs the world over think about the business of technology.
www.zdnet.com.au /reviews/hardware/peripherals/soa/Voice_over_IP_Security_stability_success/0,139023417,139154992,00.htm   (1291 words)

 Voice over IP Security
Before jumping into the security factors of a voice over IP network, let's examine the rationale behind it.
The analog voice signal is digitized, compressed, chunked into packets and sent over a data network.
As evidenced by the explosive growth of the voice over IP market, this technology will work its way into your businesses and networks.
www.securityfocus.com /infocus/1767   (1747 words)

 Voice over IP Calculator
The Voice over IP Calculators are free online tools for performing a variety of technical calculations relating to the design of voice over IP systems.
Share ideas on the technical and operational aspects of Voice over IP and network convergence in these two discussion groups.
Books covering Voice over IP and telecommunications design are reviewed in this area, and are available for purchase online.
www.voip-calculator.com   (463 words)

 Wireless Glossary: Voice over IP (VoIP)
Over the next several years, companies will deploy VoIP in conjunction with 802.11 wireless LANs, enabling workers to have WLAN-based mobile phones when in the office." />
VoIP is a set of technologies that enables voice to be sent over a packet network.
Over the next several years, companies will deploy VoIP in conjunction with 802.11 wireless LANs, enabling workers to have WLAN-based mobile phones when in the office.
www.devx.com /wireless/Door/11321   (215 words)

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