 A typical analog telephone adapter for connecting an ordinary phone to a VoIP network Voice over IP (also called VoIP, IP Telephony, Internet telephony, and Digital Phone) is the routing of voice conversations over the Internet or any other IP-based network. The voice data flows over a general-purpose packet-switched network, instead of traditional dedicated, circuit-switched voice transmission lines. Image File history File links Voip-typical. ...
Image File history File links Voip-typical. ...
Image File history File links Voip-box. ...
Image File history File links Voip-box. ...
This article discusses routing in computer networks. ...
The word voice can be used to refer to: Sound: The human voice. ...
The Internet Protocol (IP) is a data-oriented protocol used by source and destination hosts for communicating data across a packet-switched internetwork. ...
In computer networking and telecommunications, packet switching is a communications paradigm in which packets (messages or fragments of messages) are individually routed between nodes, with no previously established communication path. ...
In telecommunication, the term circuit switching has the following meanings: 1. ...
Protocols used to carry voice signals over the IP network are commonly referred to as Voice over IP or VoIP protocols. The word protocol derives from a Greek phrase meaning first leaf, referring to the first draft of a treaty. ...
Voice over IP traffic may be deployed on any IP network, including ones lacking a connection to the rest of the Internet, for instance on a private building-wide LAN. A local area network (LAN) is a computer network covering a local area, like a home, office or small group of buildings such as a college. ...
Technical details
Implementation challenges Because IP does not provide any mechanism to ensure that data packets are delivered in sequential order, or provide any Quality of Service guarantees, VoIP implementations may face problems dealing with latency, especially if satellite circuits are involved. They are faced with the problem of restructuring streams of received IP packets, which can come in any order and have packets missing, to ensure that the ensuing audio stream maintains a proper time consistency. To help with this, the network provider can ensure that there is enough end-to-end bandwidth to guarantee low-latency, high quality voice. This is trivial in private networks, but very difficult on consumer Internet links with less than 256 kbit/s bandwidth. In the fields of packet-switched networks and computer networking, the traffic engineering term Quality of Service (QoS) refers to the probability of the telecommunication network meeting a given traffic contract, or in many cases is used informally to refer the probability of a packet succeeding in passing between two...
Latency is a time delay between the moment something is initiated, and the moment one of its effects begins. ...
Another main challenge is routing VoIP traffic to traverse certain firewalls and NAT. Intermediary devices called Session Border Controllers (SBC) are often used to achieve this, though some proprietary systems such as Skype traverse firewall and NAT without a SBC by using users' computers as super node servers to route other people's calls. In computing, a firewall is a piece of hardware and/or software which functions in a networked environment to prevent some communications forbidden by the security policy, analogous to the function of firewalls in building construction. ...
In computer networking, network address translation (NAT, also known as network masquerading or IP-masquerading) is a technique in which the source and/or destination addresses of IP packets are rewritten as they pass through a router or firewall. ...
A Session Border Controller (SBC) is a device used in some VoIP networks. ...
Skype (IPA pronunciation: to rhyme with stripe) is a proprietary peer-to-peer internet telephony (VoIP) network, founded by Niklas Zennström and Janus Friis, the creators of KaZaA and competing against established open VoIP protocols like SIP or H.323. ...
Keeping packet latency acceptable can also be a problem, simply due to transmission distances.
Protocols After a long and at times heated debate about what protocol is best suited to replace today's Public Switched Telephone Network (PSTN) telephony infrastructure, the industry has now settled on the Session Initiation Protocol (SIP), an IETF standard. While most Voice over IP (VoIP) systems deployed in the Enterprise as a replacement of aging PBX systems still remain proprietary, carriers and ISPs have started to invest heavily in their next generation infrastructure based on SIP. A notable exception on the Enterprise IP PBX side is sipX - The Open Source SIP PBX for Linux from SIPfoundry, a fully SIP compliant implementation running on Linux and available for free. The public switched telephone network (PSTN) is the concatenation of the worlds public circuit-switched telephone networks, in much the same way that the Internet is the concatenation of the worlds public IP-based packet-switched networks. ...
Session Initiation Protocol (SIP) is a protocol developed by the IETF MMUSIC Working Group and proposed standard for initiating, modifying, and terminating an interactive user session that involves multimedia elements such as video, voice, instant messaging, online games, and virtual reality. ...
The Internet Engineering Task Force (IETF) is charged with developing and promoting Internet standards. ...
A Private Branch eXchange (also called PBX or Private Business eXchange) is a telephone exchange that is owned by a private business, as opposed to one owned by a common carrier or by a telephone company. ...
sipX – The SIP PBX for Linux is an open source software implementation of a Session Initiation Protocol (SIP) based communications server. ...
Signaling protocols: Telecommunication In telecommunication, the term signaling has the following meanings: The use of signals for controlling communications. ...
- Session Initiation Protocol (SIP)
- defined by the IETF, newer than H.323, is becoming the dominant protocol
- H.323
- defined by the ITU-T
- Megaco (a.k.a. H.248) and MGCP
- both media gateway control protocols
- Skinny Client Control Protocol
- proprietary protocol from Cisco
- MiNET
- proprietary protocol from Mitel
- IAX
- the Inter-Asterisk eXchange protocol used by the Asterisk open source PBX server and associated client software
- Skype
- a proprietary peer-to-peer protocol used in the Skype application
Several different speech codecs can be used for stream audio compression. Commonly used codecs for VoIP traffic include G.711 and G.729, both ITU-T-specified codecs. Session Initiation Protocol (SIP) is a protocol developed by the IETF MMUSIC Working Group and proposed standard for initiating, modifying, and terminating an interactive user session that involves multimedia elements such as video, voice, instant messaging, online games, and virtual reality. ...
The Internet Engineering Task Force (IETF) is charged with developing and promoting Internet standards. ...
H.323 is an umbrella recommendation from the ITU-T, that defines the protocols to provide audio-visual communication sessions on any packet network. ...
The ITU Telecommunication Standardization Sector (ITU-T) coordinates standards for telecommunications on behalf of the International Telecommunication Union (ITU) and is based in Geneva, Switzerland. ...
Megaco (a contraction of Media Gateway Controller) is a signalling protocol, used between a Media Gateway and a Media Gateway Controller (also known as a Call Agent or a Soft Switch) in a VOIP network. ...
In computing, Media Gateway Control Protocol (MGCP) is a protocol used within a Voice over IP system. ...
This page meets Wikipedias criteria for speedy deletion. ...
SCCP is a proprietary VoIP terminal control protocol originally developed by Selius Corporation. ...
Cisco may mean: Cisco (fish) Coregonus artedi, or any of several related fish species in Coregonus (Salmonidae) Cisco Systems, a computer networking company CISCO Security Private Limited, a security company in Singapore Abbreviation of Commercial and Industrial Security Corporation, a statutory board in Singapore An abbreviation for the name of...
MiNET is a stimulus protocol that carries keystroke information from a telephone set to a call control server. ...
Mitel is a high-tech company specializing in the sale of voice communication equipment for business. ...
IAX is the Inter-Asterisk eXchange protocol used by Asterisk, an open source PBX server from Digium. ...
Asterisk is an open source software implementation of a telephone private branch exchange (PBX). ...
A Private Branch eXchange (also called PBX or Private Business eXchange) is a telephone exchange that is owned by a private business, as opposed to one owned by a common carrier or by a telephone company. ...
Skype (IPA pronunciation: to rhyme with stripe) is a proprietary peer-to-peer internet telephony (VoIP) network, founded by Niklas Zennström and Janus Friis, the creators of KaZaA and competing against established open VoIP protocols like SIP or H.323. ...
A peer-to-peer (or P2P) computer network is a network that relies on the computing power and bandwidth of the participants in the network rather than concentrating it in a relatively few servers. ...
Skype (IPA pronunciation: to rhyme with stripe) is a proprietary peer-to-peer internet telephony (VoIP) network, founded by Niklas Zennström and Janus Friis, the creators of KaZaA and competing against established open VoIP protocols like SIP or H.323. ...
Note: This article is about audio data compression, which reduces the data rate of digital audio signals. ...
G.711 is an ITU-T standard for audio companding. ...
G.729 is an audio data compression algorithm for voice that compresses voice audio in chunks of 10 milliseconds. ...
The ITU Telecommunication Standardization Sector (ITU-T) coordinates standards for telecommunications on behalf of the International Telecommunication Union (ITU) and is based in Geneva, Switzerland. ...
Advantages - Freer innovation. Innovation progresses at market rates rather than the slow pace of the multilateral International Telecommunications Union (ITU) committee process, resulting in more new advanced features.
- Lower Cost. In general phone service via VOIP costs less than equivalent service from traditional sources. This is largely a function of traditional phone services either being monopolies or government entities. There are also some cost savings due to using a single network to carry voice and data. This is especially true when users have existing under-utilized network capacity that they can use for VOIP without any additional costs. In the most extreme case, users see VOIP phone calls (even international) as FREE. While there is a cost for their Internet service, using VOIP over this service usually does not involve any extra charges, so the users view the calls as free. There are a number of services that have sprung up to facilitate this type of "free" VOIP call. Examples are: Free World Dialup and Skype.
- Increased Functionality. VOIP makes easy some things that are difficult to impossible with traditional phone networks.
- Incoming phone calls are automatically routed to your VOIP phone where ever you are connected the network. Take your VOIP phone with you on a trip, and anywhere you connect it to the Internet, you can receive your incoming calls.
- Call center agents using VOIP phones can easily work from anywhere with a good Internet be provided. This includes sending and receiving messages or data files in parallel with the voice conversation, audio conferencing, managing address books and passing information about whether others (e.g. friends or colleagues) are available online to interested parties.
The International Telecommunication Union (ITU) is an international organization established to standardize and regulate international radio and telecommunications. ...
Free World Dialup is a non-commercial Voice over IP network, founded by Jeff Pulver, Brandon Lucas & Izak Jenie that allows users to make free telephone calls using VoIP to other Free World Dialup users around the world. ...
Skype (IPA pronunciation: to rhyme with stripe) is a proprietary peer-to-peer internet telephony (VoIP) network, founded by Niklas Zennström and Janus Friis, the creators of KaZaA and competing against established open VoIP protocols like SIP or H.323. ...
Drawbacks VoIP technology still has several shortcomings that lead some to believe that it's not ready for widespread deployment. However, most industry analysts have predicted that 2005 is the Year of Inflection, which is the year in which more IP PBX ports will ship than legacy digital PBX ports.
Reliability Telephones without external power cords are powered by phone lines, which in the event of a power failure are kept functioning by back-up generators or batteries located at the telephone exchange. However, household VoIP hardware uses broadband modems and other equipment powered by household electricity, which may be subject to outages. In order to use VoIP during a power outage, an uninterruptible power supply or a generator must be installed on the premises. A telephone line (or just line) is a single-user circuit on a telephone communications system. ...
A power outage is the loss of the electricity supply to an area. ...
Early 20th century Alternator made in Budapest, Hungary, in the power generating hall of a hydroelectric station. ...
In the field of telecommunications, a telephone exchange (US: telephone switch) is a piece of equipment that connects phone calls. ...
An uninterruptible power supply, or UPS, is a device or system that maintains a continuous supply of electric power to certain essential equipment that must not be shut down unexpectedly. ...
Additionally, broadband connections may have less than desirable reliability. Where IP packets are lost or delayed at any point in the network between VoIP users, there will be a momentary drop-out of voice. This is more noticeable in highly congested networks and/or where there is long distances and/or interworking between end points.
Emergency calls The nature of IP makes it difficult to geographically locate network users. Emergency calls, therefore, can not easily be routed to a nearby call center, and are impossible on some VoIP systems. Moreover, in the event that the caller is unable to give an address, emergency services may be unable to locate them in any other way. Following the lead of mobile phone carriers, several VoIP carriers are already implementing a technical work-around. The United States government had set a deadline, requiring VoIP carriers to implement e911, however, the deadline is being appealed by several of leading VoIP companies. Enhanced 911 service or E911 service is a North American telephone network feature that automatically associates the physical address with the calling partys telephone number. ...
This is a different situation with IPBX systems, where these corporate systems often have full e911 capabilities built into the system. An IPBX is the intranet version of a PBX, or Private Branch eXchange. ...
A simple solution to this problem is to store the local emergency numbers on speed dial which is usually even faster than having to be transfered by the 911 operator.
Integration into global telephone number system Whilst the traditional Plain Old Telephone System (POTS) and mobile phone networks share a common global standard (E.164) which allocates and identifies any specific telephone line, there is no widely adopted similar standard for VoIP networks. Some allocate an E.164 number which can be used for VoIP as well as incoming/external calls. However, there are often different, incompatible schemes when calling between VoIP providers which use short codes that are provider specific. Plain old telephone service, or POTS, are the services available from analogue telephones prior to the introduction of electronic telephone exchanges into the public switched telephone network. ...
This article needs to be cleaned up to conform to a higher standard of quality. ...
Single point of calling With commercial services such as Vonage, it is possible to connect the VoIP router into the existing central phone box in the house and have VoIP at every phone already connected. Other services, such as Skype require the use of a computer, so they are limited to single point of calling. Some services, such as BroadVoice provide the ability to connect WiFi SIP phones so that service can be extended throughout the premises, and off-site to any location with an open hotspot. Vonage is a commercial voice over IP network that provides telephone service via a broadband connection. ...
Skype (IPA pronunciation: to rhyme with stripe) is a proprietary peer-to-peer internet telephony (VoIP) network, founded by Niklas Zennström and Janus Friis, the creators of KaZaA and competing against established open VoIP protocols like SIP or H.323. ...
BroadVoice is a Voice over IP (VoIP) network that allows users to conduct voice communications via a broadband Internet connection. ...
Wi-Fi (or Wi-fi, WiFi, Wifi, wifi), short for Wireless Fidelity, is a set of standards for wireless local area networks (WLAN) currently based on the IEEE 802. ...
A hotspot is a Wi-Fi access point or area, in particular for connecting to Internet. ...
Mobile phones Telcos and consumers have invested billions of dollars in mobile phone equipment. In developed countries, mobile phones have achieved nearly complete market penetration, and many people are giving up landlines and using mobiles exclusively. Given this situation, it is not entirely sure whether there would be a significant higher demand for VoIP among consumers until either a) public or community wireless networks have similar geographical coverage to cellular networks (thereby enabling mobile VoIP phones, so called WiFi phones) or b) VoIP is implemented over legacy 3G networks. However, "dual mode" handsets, which allow for the seamless handover between a cellular network and a WiFi network, are expected to help VoIP become more popular. TATA Engineering and Locomotive Company A telephone company (or telco) provides telecommunications services such as telephony and data communications. ...
Market penetration is one of the four growth strategies as defined by Ansoff. ...
Wireless networks are telephone or computer networks that use radio as their carrier or physical layer. ...
3G (or 3-G) is short for third-generation mobile telephone technology. ...
Adoption
Mass-market telephony A major development starting in 2004 has been the introduction of mass-market VoIP services over broadband Internet access services, in which subscribers make and receive calls as they would over the PSTN. This requires an analog telephone adapter (ATA) to connect a telephone to the broadband Internet connection. Companies in the U.S., such as Vonage, AT&T, Cablevision, Broadvoice, Time Warner Cable, Comcast, Verizon, Packet8, Lingo, and SunRocket, use IP to offer unlimited calling to the U.S., and sometimes to Canada or to selected countries in Europe or Asia, for a flat monthly fee. One advantage of this is the ability to make and receive calls as one would at home, anywhere in the world, at no extra cost. As calls go via IP, this does not incur charges as call diversion does via the PSTN, and the called party does not have to pay for the call. A WildBlue Satellite Internet dish. ...
The public switched telephone network (PSTN) is the concatenation of the worlds public circuit-switched telephone networks, in much the same way that the Internet is the concatenation of the worlds public IP-based packet-switched networks. ...
...
Vonage is a commercial voice over IP network that provides telephone service via a broadband connection. ...
AT&T (formerly an abbreviation for American Telephone and Telegraph) Corporation NYSE: T is an American telecommunications company. ...
Cablevision Systems Corporation ( NYSE: CVC) is a cable television company that serves parts of the Northeast of the United States, with most customers residing in New York, New Jersey and Connecticut. ...
BroadVoice is a Voice over IP (VoIP) network that allows users to conduct voice communications via a broadband Internet connection. ...
Time Warner Inc. ...
Comcast Corporation, (NASDAQ: CMCSA) based in Philadelphia, Pennsylvania is the largest cable company in the United States. ...
This article or section should include material from Bell Atlantic This article or section should include material from GTE Verizon Communications (NYSE: VZ) is a local exchange telephone company formed by the merger of Bell Atlantic, a former Bell Operating Company, and GTE, which was the largest independant local exchange...
Packet8 is a commercial Voice over IP network, that provides telephone service via a broadband connection. ...
Lingo is an American television game show that GSN produced along with other companies. ...
This article is being considered for deletion in accordance with Wikipedias deletion policy. ...
World map showing location of Europe When considered a continent, Europe is the worlds second-smallest continent in terms of area, with an area of 10,600,000 km² (4,140,625 square miles), making it larger than Australia only. ...
World map showing location of Asia Asia is the central and eastern part of Eurasia, defined by subtracting Europe from Eurasia. ...
For example, somebody may call someone on a number with a U.S. area code, but one could be in London, and if someone were to call another number with that area code, it would be treated as a local call, regardless of where that person is in the world. However, the broadband phone is likely to complement, rather than replace a PSTN line, as it still needs a power supply, while calling the U.S. emergency services number 911, may not automatically be routed to the nearest local emergency dispatch center, or be of any use for subscribers outside the U.S. A telephone numbering plan is a system that allows subscribers to make and receive telephone calls across long distances. ...
The clock tower of the Palace of Westminster, which contains Big Ben London is the capital city of the United Kingdom and of England. ...
Most emergency vehicles in the US and Canada display Emergency 911 9-1-1 (nine-one-one or nine-eleven) is the emergency telephone number for the North American Numbering Plan (NANP). ...
An emergency is a situation that poses an immediate threat to human life or serious damage to property. ...
A dispatch can be: A report sent to a newspaper by a correspondent. ...
Another challenge for these services is the proper handling of outgoing calls from fax machines, TiVo/ReplayTV boxes, satellite television receivers, alarm systems, conventional modems or FAXmodems, and other similar devices that depend on access to a voice-grade telephone line for some or all of their functionality. At present, these types of calls sometimes go through without any problems, but in other cases they will not go through at all. And in some cases, this equipment can be made to work over a VoIP connection if the sending speed can be changed to a lower bits per second rate. If VoIP and cellular substitution becomes very popular, some ancillary equipment makers may be forced to redesign equipment, because it would no longer be possible to assume a conventional voice-grade telephone line would be available in almost all homes in North America and Western-Europe. The TestYourVoIP website offers a free service to test the quality of or diagnose an Internet connection by placing simulated VoIP calls from any Java-enabled Web browser, or from any phone or VoIP device capable of calling the PSTN network. Fax (short for facsimile - from Latin fac simile, make similar, i. ...
Satellite television is television delivered by way of orbiting communications satellites located 37,000 km (22,300 miles) above the earth’s equator. ...
For the British anti-radiation missile, see ALARM. An alarm gives an audible or visual warning of a problem or condition. ...
A modem (a portmanteau word constructed from modulator and demodulator) is a device that modulates an analog carrier signal (sound) to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. ...
This article needs to be cleaned up to conform to a higher standard of quality. ...
In telecommunications and computing, bit rate (sometimes written bitrate) is the frequency at which bits are passing a given (physical or metaphorical) point. It is quantified using the bit per second (bit/s) unit. ...
Cellular redirects here. ...
TestYourVoIP is a free web service run by Brix Networks that allows you to test your internet connection to see how well it will perform when used for VoIP calls. ...
A Java Virtual Machine or JVM is a virtual machine that runs Java byte code. ...
Corporate and telco use Although few office environments and even fewer homes use a pure VoIP infrastructure, telecommunications providers routinely use IP telephony, often over a dedicated IP network, to connect switching stations, converting voice signals to IP packets and back. The result is a data-abstracted digital network which the provider can easily upgrade and use for multiple purposes.
Corporate customer telephone support often use IP telephony exclusively to take advantage of the data abstraction. The benefit of using this technology is the need for only one class of circuit connection and better bandwidth use. Companies can acquire their own gateways to eliminate third-party costs, which is worthwhile in some situations.
VoIP is widely employed by carriers, especially for international telephone calls. It is commonly used to route traffic starting and ending at conventional PSTN telephones.
Many telecommunications companies are looking at the IP Multimedia Subsystem which will merge Internet technologies with the mobile world, using a pure VoIP infrastructure. It will enable them to upgrade their existing systems while embracing Internet technologies such as the Web, email, instant messaging, presence, and video conferencing. It will also allow existing VoIP systems to interface with the conventional PSTN and mobile phones. The IP Multimedia Subsystem (IMS) is an open, standardised, operator friendly, Next Generation Networking (NGN) multi-media architecture for mobile and fixed IP services. ...
Electronic Numbering (Enum) uses standard phone numbers (E.164), but allows connections entirely over the Internet. If the other party uses Enum, the only expense is the Internet connection. Electronic Numbering (ENUM or Enum) is a suite of protocols to unify the telephone system with the Internet by using E.164 addresses with DDDS and DNS. The acronymn ENUM is actually short for E164 NUmber Mapping. ...
This article needs to be cleaned up to conform to a higher standard of quality. ...
See also
Networks - Bandwidth.com
- A Nation-wide Business VoIP carrier offering full Class-5 calling features, VoIP auto-attendant, and soft phone and moble device integration. Support SIP and MGCP
- BroadVoice
- A U.S.-based VoIP network that supplies VoIP adapters, or allows customers to use their own SIP devices.
- Congruent IP Communications
- A Canadian-based hosted VoIP services that operates on Nortel's MCS5200 carrier-grade platform. This platform uses SIP and requires no customer premises equipment.
- Free IP Call
- The Home to Free IP Call, SIP and VoIP Networks Provider.
- Free World Dialup (FWD)
- A free SIP-based VoIP network.
- Gizmo
- Gizmo Project uses your internet connection (broadband or dial-up) to make calls to other computers, phones and mobiles.
- Lingo
- MetroTel
- A U.S.-based VoIP Provider with 800 and local numbers
- MyWebCalls
- A UK-based VoIP phone service using SIP and also supporting the Asterisk PBX
- SIPphone
- A SIP-based VoIP network.
- Skype
- A proprietary freeware VoIP system which uses a messenger-like client.
- SunRocket
- A U.S. Based VoIP phone service provider
- Teleo
- A VoIP network using a P2P model
- Telio
- A European based VoIP phone service provider
- TelTel
- The largest SIP community
- TeleCable Services
- A U.S.-based VoIP phone service provider, supplies VoIP adapters or allows customers to use their own SIP devices.
- TelSIP
- A European-based VoIP network providing the only SIP solution that traverses firewalls and proxies.
- Voipex
- A U.S.-based VoIP phone service
- Vonage
- A U.S.-based VoIP phone service provider
Bandwidth. ...
BroadVoice is a Voice over IP (VoIP) network that allows users to conduct voice communications via a broadband Internet connection. ...
Session Initiation Protocol (SIP) is a protocol developed by the IETF MMUSIC Working Group and proposed standard for initiating, modifying, and terminating an interactive user session that involves multimedia elements such as video, voice, instant messaging, online games, and virtual reality. ...
Congruent IP is a commercial hosted voice over IP provider that offers telephone service via a broadband connection. ...
Session Initiation Protocol (SIP) is a protocol developed by the IETF MMUSIC Working Group and proposed standard for initiating, modifying, and terminating an interactive user session that involves multimedia elements such as video, voice, instant messaging, online games, and virtual reality. ...
Free IP Call is a Voice over IP network provider, that allows users to make free telephone calls using VoIP to other Free IP Call users around the world. ...
Free World Dialup is a non-commercial Voice over IP network, founded by Jeff Pulver, Brandon Lucas & Izak Jenie that allows users to make free telephone calls using VoIP to other Free World Dialup users around the world. ...
Gizmo may mean: A gadget or thingamajig. ...
Lingo is an American television game show that GSN produced along with other companies. ...
MetroTel Metrotel Communications, owned by James L. Taylor, has been in the telecommunications business for almost twenty years. ...
MyWebCalls is a high quality and low cost provider of VoIP calls using the SIP protocol. ...
IP Telephony, also called Internet telephony, is the technology that makes it possible to have a telephone conversation over the Internet or a dedicated Internet Protocol (IP) network instead of dedicated voice transmission lines. ...
Session Initiation Protocol (SIP) is a protocol developed by the IETF MMUSIC Working Group and proposed standard for initiating, modifying, and terminating an interactive user session that involves multimedia elements such as video, voice, instant messaging, online games, and virtual reality. ...
Asterisk is an open source software implementation of a telephone private branch exchange (PBX). ...
SIPphone is a Voice over IP telephone and a telephone directory managing the phone numbers. ...
Skype (IPA pronunciation: to rhyme with stripe) is a proprietary peer-to-peer internet telephony (VoIP) network, founded by Niklas Zennström and Janus Friis, the creators of KaZaA and competing against established open VoIP protocols like SIP or H.323. ...
Proprietary software is a term used to describe software designed, coded, and owned by a defined person, organization or group of organizations. ...
Freeware (also called gratis software or free as in beer software) is computer software which is made available free of charge and is not free to be used, copied, studied, modified and redistributed. ...
This article is being considered for deletion in accordance with Wikipedias deletion policy. ...
Teleo is a peer-to-peer internet telephony (VoIP) network, founded by Wendell Brown. ...
A peer-to-peer (or P2P) computer network is a network that relies on the computing power and bandwidth of the participants in the network rather than concentrating it in a relatively few servers. ...
Telio is Norways first commercial Voice over IP network, that provides telephone service via a broadband connection. ...
TeleCable Services VoiceNet is a Voice over IP (VoIP) company that provides telephone service via a broadband Internet connection in certain areas of the United States. ...
TelSIP is a SIP-based Voice-over-IP communication technology developed in Europe. ...
IP Telephony, also called Internet telephony, is the technology that makes it possible to have a telephone conversation over the Internet or a dedicated Internet Protocol (IP) network instead of dedicated voice transmission lines. ...
Session Initiation Protocol (SIP) is a protocol developed by the IETF MMUSIC Working Group and proposed standard for initiating, modifying, and terminating an interactive user session that involves multimedia elements such as video, voice, instant messaging, online games, and virtual reality. ...
In computing, a firewall is a piece of hardware and/or software which functions in a networked environment to prevent some communications forbidden by the security policy, analogous to the function of firewalls in building construction. ...
The word proxy can mean more than one thing: a person authorized to act for another person, or upon request by another person (see eg. ...
Voipex is a Voice over IP (VoIP) Phone company that provides telephone service via a broadband Internet connection with many free classified features. ...
Vonage is a commercial voice over IP network that provides telephone service via a broadband connection. ...
Software - Asterisk PBX : The popular Linux-based open source software PBX switch.
- GameComm Roger Wilco, Teamspeak, and Ventrilo : Voice communication programs popular in online gaming.
- Google Talk : A free VoIP system from Google.
- GnomeMeeting : The popular Linux-based open source softphone, supports H.323 and soon SIP.
- IPCC: IP Contact Center from FrontRange Solutions
- IP Multimedia Subsystem : architectural model (with several SIP extensions), used by the traditional telecommunications industry to develop systems to replace the current circuit switched network with a NGN network.
- Jajah : A freeware VoIP client with free videotelephony, chat, text messaging, voicemailbox and is compatible to SIP, Skype, Gizmo and IAX/H.323
- Mobicents: An open source Java VoIP Service Delivery Platform (SDP) for Next Generation IP Multimedia Subsystem (NG IMS). The First and Only open source Certified implementation of JAIN SLEE 1.0.
- PhoneGaim : A free VoIP system based on Gaim and SIP.
- ReSIProcate : A robust and feature-rich open source SIP stack.
- SIMPLE : An instant messaging and presence protocol based on SIP.
- sipX : The popular open source SIP PBX, native SIP call control, many features, Web management, and fully standards-compliant
- Skype : Skype is a free VoIP client that offers in and outbound PSTN facilities.
- *starShop-OSS : Open Source professional and powerful billing and management system based on Asterisk PBX for Calling Shops and Internet cafes.
- Tivi : A SIP VoIP client softphone.
- TERAVoice Server - TERAVoice VoIP Gateway
- YATE : A free software VoIP telephony engine (VoIP server and client for H.323,IAX,SIP)
Asterisk is an open source software implementation of a telephone private branch exchange (PBX). ...
GameComm is a voice communications package similar to Ventrilo and Teamspeak. ...
Roger Wilco may be: Roger Wilco was a character in the game Space Quest. ...
Teamspeak is a Voice over IP program. ...
Screenshot of the Ventrilo client connected to a server. ...
Google Talk is a service developed by Google for instant messaging (IM) that also allows for PC to PC audio conversations . ...
GnomeMeeting is an open source VoIP and video conferencing application for GNOME. It is based on the OpenH323 library and primarily uses the H.323 protocol, although support for SIP is in development. ...
FrontRange Solutions specializes in the CRM space of the software industry. ...
The IP Multimedia Subsystem (IMS) is an open, standardised, operator friendly, Next Generation Networking (NGN) multi-media architecture for mobile and fixed IP services. ...
In telecommunication, the term circuit switching has the following meanings: 1. ...
WHATS NGN? Next Generation Networking (NGN) is a broad term for a certain kind of emerging computer network architectures and technologies. ...
Jajah is a proprietary peer-to-peer internet telephony (VoIP) softphone. ...
Freeware (also called gratis software or free as in beer software) is computer software which is made available free of charge and is not free to be used, copied, studied, modified and redistributed. ...
IP Telephony, also called Internet telephony, is the technology that makes it possible to have a telephone conversation over the Internet or a dedicated Internet Protocol (IP) network instead of dedicated voice transmission lines. ...
Session Initiation Protocol (SIP) is a protocol developed by the IETF MMUSIC Working Group and proposed standard for initiating, modifying, and terminating an interactive user session that involves multimedia elements such as video, voice, instant messaging, online games, and virtual reality. ...
Skype (IPA pronunciation: to rhyme with stripe) is a proprietary peer-to-peer internet telephony (VoIP) network, founded by Niklas Zennström and Janus Friis, the creators of KaZaA and competing against established open VoIP protocols like SIP or H.323. ...
Gizmo may mean: A gadget or thingamajig. ...
IAX is the Inter-Asterisk eXchange protocol used by Asterisk, an open source PBX server from Digium. ...
H.323 is an umbrella recommendation from the ITU-T, that defines the protocols to provide audio-visual communication sessions on any packet network. ...
Mobicents is a professional open source VoIP Middleware platform. ...
PhoneGaim is a free software VoIP system based on the Gaim instant messaging software and the SIP protocol, using the SIPphone service. ...
Free software, as defined by the Free Software Foundation, can be used, copied, studied, modified and redistributed. ...
Gaim 1. ...
reSIProcate is an open-source Session Initiation Protocol (SIP) stack. ...
Look up Simple in Wiktionary, the free dictionary In music a simple interval is one which lies within one octave, contrasted with a compound interval which exceeds or is wider than one octave. ...
A screenshot of PowWow, one of the first instant messengers with a graphical user interface Instant messaging is the act of instantly communicating between two or more people over a network such as the Internet. ...
Presence is a studio album by Led Zeppelin, released by Swan Song Records on March 31, 1976. ...
sipX – The SIP PBX for Linux is an open source software implementation of a Session Initiation Protocol (SIP) based communications server. ...
Skype (IPA pronunciation: to rhyme with stripe) is a proprietary peer-to-peer internet telephony (VoIP) network, founded by Niklas Zennström and Janus Friis, the creators of KaZaA and competing against established open VoIP protocols like SIP or H.323. ...
*starShop logo. ...
Asterisk is an open source software implementation of a telephone private branch exchange (PBX). ...
A call shop is a business that physically provides phones for the purpose of making long-distance telephone calls. ...
TiVi is a freeware for instant messaging and Internet telephony, conceived as a SIP-compatible softphone and having its GUI in several human languages. ...
In computing, a soft phone is software that simulates a real phone and runs on a general purpose computer, rather than a dedicated device. ...
TERAVoice Server is a commercial telephony server platform for Windows, which is also available as a free version. ...
Location within the British Isles Yate (pop. ...
Other - TestYourVoIP
- A free VoIP quality test website that just requires a Java-enabled Web browser.
- BorderWare Technologies
- BorderWare Technologies SIPassure SIP Firewall is an application layer firewall designed to enable secure IP Telephony and other SIP based applications. Includes protection against SPIT (voicemail spam), DoS Attacks, fraud and other threats.
TestYourVoIP is a free web service run by Brix Networks that allows you to test your internet connection to see how well it will perform when used for VoIP calls. ...
Related concepts In telecommunication, the term computer conferencing has the following meanings: Teleconferencing supported by one or more computers. ...
DiffServ or differentiated services is a method of trying to guarantee quality of service on large networks such as the Internet. ...
In computer networking, IntServ or integrated services is an architecture, which specifies the elements to guarantee quality of service (QoS) on networks. ...
A predictive dialer is generally a computerized system that automatically dials batches of telephone numbers, and developed from the autodialer. ...
External links - FCC VoIP Information from the FCC
- SIPfoundry – Open Source community dedicated to VoIP solutions based on SIP
- How to Distribute VoIP Throughout a Home Instructions on how to use your existing home telephone wiring with a VoIP service.
- VoIP Wiki
- DSL Reports Many user reviews of VoIP service providers
- Voxilla Well-respected source of VoIP news and user discussion boards
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