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Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. [1]

197 relations: A-law algorithm, Acronym, Analog telephone adapter, Assisted GPS, Asterisk (PBX), Asynchronous Transfer Mode, ATM Adaptation Layer 5, Audio codec, Audio over IP, Authentication, Backhaul (telecommunications), Business telephone system, Cable modem, Call shop, Caller ID, Cellular network, Central limit theorem, Circuit switching, Codec, Communications Assistance for Law Enforcement Act, Comparison of audio network protocols, Comparison of VoIP software, Data buffer, Data link layer, Denial-of-service attack, Dial peer, Differentiated services, Digital audio, Digital subscriber line, Digium, Direct inward dial, Dropout (communications), Dual-tone multi-frequency signaling, E.164, Email address, Encryption, Enhanced 9-1-1, Ethernet, Ethernet over coax, Ethiopia, European Union, Fax, Federal Communications Commission, Federated VoIP, Firewall (computing), Fountain code, G.711, G.722, G.729, G.hn, ..., Geosynchronous satellite, Gizmo5, Google Talk, Grandstream Networks, GSM, H.248, H.323, Hacker (computer security), High bit rate media transport, High fidelity, IEEE 802.11, IEEE 802.11e-2005, IEEE P802.1p, Impedance matching, Incumbent local exchange carrier, India, Institute of Electrical and Electronics Engineers, Integrated services, Intel, Inter-Asterisk eXchange, Interactive Connectivity Establishment, Interconnection, Internet, Internet access, Internet fax, Internet Low Bitrate Codec, Internet Protocol, Internet service provider, Internet telephony service provider, IP Multimedia Subsystem, IPsec, IPv4, ITU-T, Jingle (protocol), Jitsi, Jitter, John Walker (programmer), Landline, Latency (audio), Latency (engineering), Least-cost routing, Level 3 Communications, Local area network, Local number portability, Mains electricity, Managed facilities-based voice network, Mark Spencer (computer engineer), Maximum transmission unit, Mean opinion score, Media access control, Media Gateway Control Protocol, Microsoft, Mobile number portability, Mobile VoIP, Multimedia, Multipath routing, Multiplexing, Narrowband, National Science Foundation, National Science Foundation Network, Network address translation, Network Voice Protocol, Normal distribution, Off-premises extension, Oman, Open-source software, Opportunistic encryption, Packet switching, Panama, Personal computer, Physical layer, Plain old telephone service, Point-to-point (telecommunications), Power-line communication, Predictive dialer, Proprietary protocol, Public land mobile network, Public switched telephone network, Publicly Available Telephone Services, Push-button telephone, Quality of experience, Quality of service, Radvision, Raptor code, Real-time Transport Protocol, Router (computing), RTP audio video profile, RTP Control Protocol, Secure Real-time Transport Protocol, Secure telephone, Session border controller, Session Description Protocol, Session Initiation Protocol, Short Message Service, Sim box, SIP trunking, SIPRNet, Skype, Skype protocol, Smartphone, Softphone, Softswitch, South Korea, Speech, Speech coding, Spoofing attack, StrataCom, Streaming media, STUN, T.38, TeamSpeak, Teleconference, Telephone line, Telephone number mapping, Telephony, Time-division multiplexing, Transmission Control Protocol, Type 1 product, Unified communications, Uniform Resource Identifier, UNIStim, United Arab Emirates, United States Forces Korea, Universal service, USB, User Datagram Protocol, Very-high-bit-rate digital subscriber line, Very-high-bit-rate digital subscriber line 2, Virtual private network, VoATM, VocalTec, Voice engine, VoiceXML, VoIP gateway, VoIP phone, VoIP recording, VoIP VPN, VoLTE, Web-based VoIP, Wi-Fi, Wireshark, XMPP, ZRTP, 112 (emergency telephone number), 3G, 4G, 9-1-1. Expand index (147 more) »

An A-law algorithm is a standard companding algorithm, used in European 8-bit PCM digital communications systems to optimize, i.e., modify, the dynamic range of an analog signal for digitizing.

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An acronym is an abbreviation, used as a word, which is formed from the initial components in a phrase or a word.

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An analog telephone adapter (ATA) is a device for connecting traditional analog telephones, fax machines, and similar customer-premises devices to a digital telephone system or a voice over IP telephony network.

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Assisted GPS (abbreviated generally as A-GPS and less commonly as aGPS) is a system that is often able to significantly improve the startup performance, or time-to-first-fix (TTFF), of a GPS satellite-based positioning system.

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Asterisk is a software implementation of a telephone private branch exchange (PBX); it allows attached telephones to make calls to one another, and to connect to other telephone services, such as the public switched telephone network (PSTN) and Voice over Internet Protocol (VoIP) services.

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Asynchronous Transfer Mode (ATM) is, according to the ATM Forum, "a telecommunications concept defined by ANSI and ITU (formerly CCITT) standards for carriage of a complete range of user traffic, including voice, data, and video signals".

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ATM Adaptation Layer 5 (AAL5) is an ATM adaptation layer used to send variable-length packets up to 65,535 octets in size across an Asynchronous Transfer Mode (ATM) network.

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An audio codec is a device or computer program capable of coding or decoding a digital data stream of audio.

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Streaming audio over IP (AoIP) networks is being increasingly used by broadcasting companies, among others, to provide high-quality audio feeds over distance across an IP network such as the Internet.

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Authentication (from authentikos, "real, genuine," from αὐθέντης authentes, "author") is the act of confirming the truth of an attribute of a single piece of data (a datum) claimed true by an entity.

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In a hierarchical telecommunications network the backhaul portion of the network comprises the intermediate links between the core network, or backbone network and the small subnetworks at the "edge" of the entire hierarchical network.

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A business telephone system is a multiline telephone system typically used in business environments, encompassing systems ranging from small key telephone systems to large-scale private branch exchanges.

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A cable modem is a type of network bridge and modem that provides bi-directional data communication via radio frequency channels on a hybrid fibre-coaxial (HFC) and RFoG infrastructure.

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A call shop is a business providing on-site access to telephones for long-distance calling in countries without widespread home long-distance service.

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Caller ID (caller identification, CID), also called calling line identification (CLID), calling number delivery (CND), calling number identification (CNID) or calling line identification presentation (CLIP), is a telephone service, available in analog and digital phone systems and most voice over Internet Protocol (VoIP) applications, that transmits a caller's number to the called party's telephone equipment during the ringing signal, or when the call is being set up but before the call is answered.

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A cellular network or mobile network is a communications network where the last link is wireless.

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In probability theory, the central limit theorem (CLT) states that, given certain conditions, the arithmetic mean of a sufficiently large number of iterates of independent random variables, each with a well-defined expected value and well-defined variance, will be approximately normally distributed, regardless of the underlying distribution.

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Circuit switching is a methodology of implementing a telecommunications network in which two network nodes establish a dedicated communications channel (circuit) through the network before the nodes may communicate.

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A codec is a device or computer program capable of encoding or decoding a digital data stream or signal.

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The Communications Assistance for Law Enforcement Act (CALEA) is a United States wiretapping law passed in 1994, during the presidency of Bill Clinton (Pub. L. No. 103-414, 108 Stat. 4279, codified at 47 USC 1001-1010).

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Category:Audio network protocols.

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This is a comparison of Voice over IP (VoIP) software used to conduct telephone-like voice conversations across Internet Protocol (IP) based networks.

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In computer science, a data buffer (or just buffer) is a region of a physical memory storage used to temporarily store data while it is being moved from one place to another.

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The data link layer or layer 2 is the second layer of the seven-layer OSI model of computer networking.

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In computing, a denial-of-service (DoS) attack is an attempt to make a machine or network resource unavailable to its intended users, such as to temporarily or indefinitely interrupt or suspend services of a host connected to the Internet.

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A dial peer, also termed addressable call endpoint, initiates or obtains calls within a telephone network.

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Differentiated services or DiffServ is a computer networking architecture that specifies a simple, scalable and coarse-grained mechanism for classifying and managing network traffic and providing quality of service (QoS) on modern IP networks.

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Digital audio is technology that can be used to record, store, generate, manipulate, and reproduce sound using audio signals encoded in digital form.

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Digital subscriber line (DSL; originally digital subscriber loop) is a family of technologies that are used to transmit digital data over telephone lines.

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Digium, Inc. is a privately held communications technology company based in Huntsville, Alabama.

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Direct inward dialing (DID), also called direct dial-in (DDI) in Europe and Oceania, is a telecommunication service offered by telephone companies to subscribers who operate a private branch exchange (PBX) system.

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A dropout is a momentary loss of signal in a communications system, usually caused by noise, propagation anomalies, or system malfunctions.

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Dual-tone multi-frequency signaling (DTMF) is an in-band telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers.

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E.164 is an ITU-T recommendation, titled The international public telecommunication numbering plan, that defines a numbering plan for the world-wide public switched telephone network (PSTN) and some other data networks.

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An email address identifies an email box to which email messages are delivered.

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In cryptography, encryption is the process of encoding messages or information in such a way that only authorized parties can read it.

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Enhanced 911, E-911 or E911 is a system used in North America that links emergency callers with the appropriate public resources.

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Ethernet is a family of computer networking technologies for local area networks (LANs) and metropolitan area networks (MANs).

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Ethernet over Coax (EoC) is a family of technologies that supports the transmission of Ethernet frames over coaxial cable.

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Ethiopia (ኢትዮጵያ), officially known as the Federal Democratic Republic of Ethiopia, is a country located in the Horn of Africa.

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The European Union (EU) is a politico-economic union of EUnum member states that are located primarily in Europe.

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Fax (short for facsimile), sometimes called telecopying or telefax, is the telephonic transmission of scanned printed material (both text and images), normally to a telephone number connected to a printer or other output device.

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The Federal Communications Commission (FCC) is an independent agency of the United States government, created by Congressional statute (see and) to regulate interstate communications by radio, television, wire, satellite, and cable in all 50 states, the District of Columbia and U.S. territories.

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Federated VoIP is a form of packetized voice telephony that uses voice over IP between autonomous domains in the public Internet without the deployment of central virtual exchange points or switching centers for traffic routing.

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In computing, a firewall is a network security system that monitors and controls the incoming and outgoing network traffic based on predetermined security rules.

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In coding theory, fountain codes (also known as rateless erasure codes) are a class of erasure codes with the property that a potentially limitless sequence of encoding symbols can be generated from a given set of source symbols such that the original source symbols can ideally be recovered from any subset of the encoding symbols of size equal to or only slightly larger than the number of source symbols.

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G.711 is an ITU-T standard for audio companding.

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G.722 is an ITU-T standard 7 kHz Wideband audio codec operating at 48, 56 and 64 kbit/s.

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G.729 is an audio data compression algorithm for voice that compresses digital voice in packets of 10 milliseconds duration.

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G.hn is the common name for a home network technology family of standards developed under the International Telecommunication Union's Telecommunication Standardization sector (the ITU-T) and promoted by the HomeGrid Forum and several other organizations.

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A geosynchronous satellite is a satellite in geosynchronous orbit, with an orbital period the same as the Earth's rotation period.

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Gizmo5 (formerly known as Gizmo Project and SIPphone) was a Voice over IP communications network and a proprietary freeware soft phone for that network.

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Google Talk is an instant messaging service that provides both text and voice communication.

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Founded in 2002, Grandstream Networks is a manufacturer of IP & as well as.

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GSM (Global System for Mobile Communications, originally Groupe Spécial Mobile), is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation (2G) digital cellular networks used by mobile phones, first deployed in Finland in July 1991.

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H.248 or Megaco or Gateway Control Protocol is a recommendation from ITU Telecommunication Standardization Sector (ITU-T) which defines protocols that are used between elements of a physically decomposed multimedia gateway.

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H.323 is a recommendation from the ITU Telecommunication Standardization Sector (ITU-T) that defines the protocols to provide audio-visual communication sessions on any packet network.

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In the computer security context, a hacker is someone who seeks and exploits weaknesses in a computer system or computer network.

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High bit rate media transport (HBRMT) formerly known as High bit rate audio video over IP (HBRAV-IP), is a proposed standard for data encapsulation and forward error correction (FEC) of high bit rate contribution oriented video/audio feed services, up to 3 Gbit/s over Ethernet networks.

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High fidelity—or hi-fi or hifi—reproduction is a term used by home stereo listeners and home audio enthusiasts (audiophiles) to refer to high-quality reproduction of sound to distinguish it from the poorer quality sound produced by inexpensive audio equipment, or the inferior quality of sound reproduction that can be heard in recordings made until the late 1940s.

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IEEE 802.11 is a set of media access control (MAC) and physical layer (PHY) specifications for implementing wireless local area network (WLAN) computer communication in the 2.4, 3.6, 5, and 60 GHz frequency bands.

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IEEE 802.11e-2005 or 802.11e is an approved amendment to the IEEE 802.11 standard that defines a set of Quality of Service enhancements for wireless LAN applications through modifications to the Media Access Control (MAC) layer.

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IEEE P802.1p is the name of a task group active during 1995–98 responsible for adding traffic class expediting and dynamic multicast filtering to the IEEE 802.1D standard.

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In electronics, impedance matching is the practice of designing the input impedance of an electrical load or the output impedance of its corresponding signal source to maximize the power transfer or minimize signal reflection from the load.

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An incumbent local exchange carrier (ILEC), is a local telephone company which held the regional monopoly on landline service before the market was opened to competitive local exchange carriers, or the corporate successor of such a firm.

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India, officially the Republic of India, is a country in South Asia.

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The Institute of Electrical and Electronics Engineers (IEEE) is a professional association with its corporate office in New York City and its operations center in Piscataway, New Jersey.

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In computer networking, IntServ or integrated services is an architecture that specifies the elements to guarantee quality of service (QoS) on networks.

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Intel Corporation (commonly referred to as Intel) is an American multinational technology company headquartered in Santa Clara, California.

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Inter-Asterisk eXchange (IAX) is a communications protocol native to the Asterisk private branch exchange (PBX) software, and is supported by a few other softswitches, PBX systems, and softphones.

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Interactive Connectivity Establishment (ICE) is a technique used in computer networking involving network address translators (NATs) in Internet applications of Voice over Internet Protocol (VoIP), peer-to-peer communications, video, instant messaging and other interactive media.

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In telecommunications, interconnection is the physical linking of a carrier's network with equipment or facilities not belonging to that network.

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The Internet is the global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link billions of devices worldwide.

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Internet access connects individual computer terminals, computers, mobile devices, and computer networks to the Internet, enabling users to access Internet services, such as email and the World Wide Web.

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Internet fax, e-fax, or online fax is the use of the Internet Protocol to send a fax (facsimile), rather than using only phone networks (traditional faxing) with a fax machine.

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Internet Low Bitrate Codec (iLBC) is an open source royalty-free narrowband speech audio coding format and reference codec implementation, developed by Global IP Solutions (GIPS) formerly Global IP Solutions (acquired by Google Inc in 2011).

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The Internet Protocol (IP) is the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries.

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An Internet service provider (ISP) is an organization that provides services for accessing, using, or participating in the Internet.

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An Internet telephony service provider (ITSP) offers digital telecommunications services based on Voice over Internet Protocol (VoIP) that are provisioned via the Internet.

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The IP Multimedia Subsystem or IP Multimedia Core Network Subsystem (IMS) is an architectural framework for delivering IP multimedia services.

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Internet Protocol Security (IPsec) is a protocol suite for secure Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session.

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Internet Protocol version 4 (IPv4) is the fourth version in the development of the Internet Protocol (IP).

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The ITU Telecommunication Standardization Sector (ITU-T) is one of the three sectors (divisions or units) of the International Telecommunication Union (ITU); it coordinates standards for telecommunications.

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Jingle is an extension to the Extensible Messaging and Presence Protocol (XMPP) which adds peer-to-peer (P2P) session control (signaling) for multimedia interactions such as in Voice over IP (VoIP) or videoconferencing communications.

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Jitsi (formerly SIP Communicator) is a free and open source multiplatform voice (VoIP), videoconferencing and instant messaging application for Windows, Linux, Mac OS X and Android.

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Jitter is the deviation from true periodicity of a presumed periodic signal in electronics and telecommunications, often in relation to a reference clock source.

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John Walker (born ca. 1950) is a computer programmer, author and co-founder of the computer-aided design software company Autodesk.

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A landline telephone (also known as land line, land-line, main line, home phone, landline, fixed-line, and wireline) refers to a phone that uses a metal wire telephone line for transmission as distinguished from a mobile cellular line, which uses radio waves for transmission.

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Latency refers to a short period of delay (usually measured in milliseconds) between when an audio signal enters and when it emerges from a system.

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Latency is a time interval between the stimulation and response, or, from a more general point of view, as a time delay between the cause and the effect of some physical change in the system being observed.

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In voice telecommunications, least-cost routing (LCR) is the process of selecting the path of outbound communications traffic based on cost.

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Level 3 Communications is an American multinational telecommunications and Internet service provider company headquartered in Broomfield, Colorado.

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A local area network (LAN) is a computer network that interconnects computers within a limited area such as a residence, school, laboratory, or office building.

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LNP was invented by Edward Sonnenberg while working for Siemens.

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Mains electricity is the general-purpose alternating-current (AC) electric power supply.

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A managed facilities-based voice network, or MFVN, is a physical network owned and operated by a voice service provider that delivers traditional telephone service via a loop start analog telephone interface.

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Mark Spencer (born April 8, 1977) is an American computer engineer and is the original author of the GTK+-based instant messaging client Gaim (which has since been renamed to Pidgin), the L2TP daemon l2tpd and the Cheops Network User Interface.

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In computer networking, the maximum transmission unit (MTU) of a communications protocol of a layer is the size (in bytes or octets) of the largest protocol data unit that the layer can pass onwards.

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Mean opinion score (MOS) is a test that has been used for decades in telephony networks to obtain the human user's view of the quality of the network.

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In the IEEE 802 reference model of computer networking, the medium access control or media access control (MAC) layer is the lower sublayer of the data link layer (layer 2) of the seven-layer OSI model.

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The Media Gateway Control Protocol (MGCP) is an implementation of the Media Gateway Control Protocol architecture for controlling media gateways on Internet Protocol (IP) networks connected to the public switched telephone network (PSTN).

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Microsoft Corporation (commonly referred to as Microsoft) is an American multinational technology company headquartered in Redmond, Washington, that develops, manufactures, licenses, supports and sells computer software, consumer electronics and personal computers and services.

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Mobile number portability (MNP) enables mobile telephone users to retain their mobile telephone numbers when changing from one mobile network operator to another.

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Mobile VoIP or simply mVoIP is an extension of mobility to a Voice over IP network.

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Multimedia refers to content that uses a combination of different content forms.

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Multipath routing is the routing technique of using multiple alternative paths through a network, which can yield a variety of benefits such as fault tolerance, increased bandwidth, or improved security.

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In telecommunications and computer networks, multiplexing (sometimes contracted to muxing) is a method by which multiple analog message signals or digital data streams are combined into one signal over a shared medium.

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In radio, narrowband describes a channel in which the bandwidth of the message does not significantly exceed the channel's coherence bandwidth.

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The National Science Foundation (NSF) is a United States government agency that supports fundamental research and education in all the non-medical fields of science and engineering.

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The National Science Foundation Network (NSFNET) was a program of coordinated, evolving projects sponsored by the National Science Foundation (NSF) beginning in 1985 to promote advanced research and education networking in the United States.

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Network address translation (NAT) is a methodology of remapping one IP address space into another by modifying network address information in Internet Protocol (IP) datagram packet headers while they are in transit across a traffic routing device.

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The Network Voice Protocol (NVP) was a pioneering computer network protocol for transporting human speech over packetized communications networks.

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In probability theory, the normal (or Gaussian) distribution is a very common continuous probability distribution.

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An off-premises extension (OPX), sometimes also known as off-premises station (OPS), is an extension telephone at a location distant from its servicing private branch exchange (PBX).

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Oman (عمان), officially the Sultanate of Oman (سلطنة عُمان), is an Arab country in the southeastern coast of the Arabian Peninsula.

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Open-source software (OSS) is computer software with its source code made available with a license in which the copyright holder provides the rights to study, change, and distribute the software to anyone and for any purpose.

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Opportunistic encryption (OE) refers to any system that, when connecting to another system, attempts to encrypt the communications channel otherwise falling back to unencrypted communications.

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Packet switching is a digital networking communications method that groups all transmitted data into suitably sized blocks, called packets, which are transmitted via a medium that may be shared by multiple simultaneous communication sessions.

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Panama (Panamá), officially called the Republic of Panama (República de Panamá), is a country in Central America situated between North and South America.

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A personal computer is a general-purpose computer whose size, capabilities and original sale price make it useful for individuals, and is intended to be operated directly by an end-user with no intervening computer operator.

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In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first (lowest) layer.

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Plain old telephone service (POTS) is voice-grade telephone service employing analog signal transmission over copper loops.

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In telecommunications, a point-to-point connection refers to a communications connection between two nodes or endpoints.

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Power-line communication (PLC) carries data on a conductor that is also used simultaneously for AC electric power transmission or electric power distribution to consumers.

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A predictive dialer dials a list of telephone numbers and connects answered dials to people making calls, often referred to as agents.

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In telecommunications, a proprietary protocol is a communications protocol owned by a single organization or individual.

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A public land mobile network (PLMN), as defined in telecommunications regulation, is a network that is established and operated by an administration or by a recognized operating agency (ROA) for the specific purpose of providing land mobile telecommunications services to the public.

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The public switched telephone network (PSTN) is the aggregate of the world's circuit-switched telephone networks that are operated by national, regional, or local telephony operators, providing infrastructure and services for public telecommunication.

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Publicly Available Telephone Services or PATS means a service available to the public for originating and receiving national and international calls and access to emergency services through a telephone number or numbers in a national or international telephone numbering plan, and may, where relevant, also include one or more of the following -.

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The push-button telephone is a telephone that uses buttons or keys for dialing a telephone number to place a call to another telephone subscriber.

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Quality of Experience (QoE, QoX or simply QX) is a measure of a customer's experiences with a service (web browsing, phone call, TV broadcast, call to a Call Center).

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Quality of service (QoS) is the overall performance of a telephony or computer network, particularly the performance seen by the users of the network.

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Radvision is a provider of video conferencing and telepresence technologies over IP and wireless networks.

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In computer science, raptor codes (rapid tornado; see Tornado codes) are the first known class of fountain codes with linear time encoding and decoding.

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The Real-time Transport Protocol (RTP) is a network protocol for delivering audio and video over IP networks.

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A router is a networking device that forwards data packets between computer networks.

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Real-time audio and video conferencing and communication applications that use the Real-time Transport Protocol (RTP) employ Session Description Protocol (SDP) to describe the media streams carried in a multi-media session.

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The RTP Control Protocol (RTCP) is a sister protocol of the Real-time Transport Protocol (RTP).

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The Secure Real-time Transport Protocol (or SRTP) defines a profile of RTP (Real-time Transport Protocol), intended to provide encryption, message authentication and integrity, and replay protection to the RTP data in both unicast and multicast applications.

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A secure telephone is a telephone that provides voice security in the form of end-to-end encryption for the telephone call, and in some cases also the mutual authentication of the call parties, protecting them against a man-in-the-middle attack.

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A session border controller (SBC) is a device regularly deployed in Voice over Internet Protocol (VoIP) networks to exert control over the signaling and usually also the media streams involved in setting up, conducting, and tearing down telephone calls or other interactive media communications.

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The Session Description Protocol (SDP) is a format for describing streaming media initialization parameters.

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The Session Initiation Protocol (SIP) is a communications protocol for signaling and controlling multimedia communication sessions.

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Short Message Service (SMS) is a text messaging service component of phone, Web, or mobile communication systems.

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A sim box (also called a sim bank) is device used as part of a VoIP gateway installation.

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SIP trunking is a Voice over Internet Protocol (VoIP) and streaming media service based on the Session Initiation Protocol (SIP) by which Internet telephony service providers (ITSPs) deliver telephone services and unified communications to customers equipped with SIP-based private branch exchange (IP-PBX) and Unified Communications facilities.

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The Secret Internet Protocol Router Network (SIPRNet) is "a system of interconnected computer networks used by the U.S. Department of Defense and the U.S. Department of State to transmit classified information (up to and including information classified SECRET) by packet switching over the TCP/IP protocols in a 'completely secure' environment".

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Skype is a telecommunications application software product that specializes in providing video chat and voice calls from computers, tablets, and mobile devices via the Internet to other devices or telephones/smartphones.

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The Skype protocol is a proprietary Internet telephony network based on peer-to-peer architecture, used by Skype.

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A smartphone or smart phone is a mobile phone with an advanced mobile operating system which combines features of a personal computer operating system with other features useful for mobile or handheld use.

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A softphone is a software program for making telephone calls over the Internet using a general purpose computer, rather than using dedicated hardware.

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A softswitch, short for software switch, is a central device in a telecommunications network which connects telephone calls from one phone line to another, across a telecommunication network or the public Internet, entirely by means of software running on a general-purpose computer system.

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South Korea, officially the Republic of Korea (lit. The Republic of Great Han; ROK), and commonly referred to as Korea, is a sovereign state in East Asia, constituting the southern part of the Korean Peninsula.

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Speech is the vocalized form of human communication.

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Speech coding is an application of data compression of digital audio signals containing speech.

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In the context of network security, a spoofing attack is a situation in which one person or program successfully masquerades as another by falsifying data and thereby gaining an illegitimate advantage.

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StrataCom, Inc.

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Streaming media is multimedia that is constantly received by and presented to an end-user while being delivered by a provider.

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STUN (Session Traversal Utilities for NAT) is a standardized set of methods and a network protocol to allow an end host to discover its public IP address if it is located behind a NAT.

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T.38 is an ITU recommendation for allowing transmission of fax over IP networks in real time.

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TeamSpeak is proprietary voice-over-Internet Protocol (VoIP) software that allows computer users to speak on a chat channel with fellow computer users, much like a telephone conference call.

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A teleconference or teleseminar is the live exchange and mass articulation of information among several persons and machines remote from one another but linked by a telecommunications system.

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A telephone line or telephone circuit (or just line or circuit within the industry) is a single-user circuit on a telephone communication system.

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Telephone number mapping is a system of unifying the international telephone number system of the public switched telephone network with the Internet addressing and identification name spaces.

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Telephony is the field of technology involving the development, application, and deployment of telecommunication services for the purpose of electronic transmission of voice, fax, or data, between distant parties.

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Time-division multiplexing (TDM) is a method of transmitting and receiving independent signals over a common signal path by means of synchronized switches at each end of the transmission line so that each signal appears on the line only a fraction of time in an alternating pattern.

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The Transmission Control Protocol (TCP) is a core protocol of the Internet protocol suite.

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In cryptography, a Type 1 product is a device or system certified by the National Security Agency (NSA) for use in cryptographically securing classified U.S. Government information.

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Unified Communications (UC) is a marketing buzzword describing the integration of real-time, enterprise, communication services such as instant messaging (chat), presence information, voice (including IP telephony), mobility features (including extension mobility and single number reach), audio, web & video conferencing, fixed-mobile convergence (FMC), desktop sharing, data sharing (including web connected electronic interactive whiteboards), call control and speech recognition with non-real-time communication services such as unified messaging (integrated voicemail, e-mail, SMS and fax).

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In computing, a Uniform Resource Identifier (URI) is a string of characters used to identify the name of a resource.

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UNIStim (or Unified Networks IP Stimulus) is a Telecommunications protocol developed by Nortel (now acquired by Avaya) for IP Phone (terminals and soft phones) and IP PBX communications.

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The United Arab Emirates (دولة الإمارات العربية المتحدة), sometimes simply called the Emirates or the UAE,الامارات is a country located in the southeast end of the Arabian Peninsula on the Persian Gulf, bordering Oman to the east and Saudi Arabia to the south, as well as sharing sea borders with Qatar and Iran.

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United States Forces Korea (USFK) is a sub-unified command of United States Pacific Command (USPACOM).

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Universal service is an economic, legal and business term used mostly in regulated industries, referring to the practice of providing a baseline level of services to every resident of a country.

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USB, short for Universal Serial Bus, is an industry standard developed in the mid-1990s that defines the cables, connectors and communications protocols used in a bus for connection, communication, and power supply between computers and electronic devices.

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The User Datagram Protocol (UDP) is one of the core members of the Internet protocol suite.

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Very-high-bit-rate digital subscriber line (VDSL or VHDSL) is a digital subscriber line (DSL) technology providing data transmission faster than asymmetric digital subscriber line (ADSL) over a single flat untwisted or twisted pair of copper wires (up to 52 Mbit/s downstream and 16 Mbit/s upstream), and on coaxial cable (up to 85 Mbit/s down- and upstream) using the frequency band from 25 kHz to 12 MHz.

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Very-high-bit-rate digital subscriber line 2 (VDSL2) is an access technology that exploits the existing infrastructure of copper wires that were originally deployed for traditional telephone service as a way of delivering very-high-speed internet access.

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A virtual private network (VPN) extends a private network across a public network, such as the Internet.

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Voice over Asynchronous Transfer Mode (VoATM) is a data protocol used to transport packetized voice signals over an Asynchronous Transfer Mode (ATM) network.

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VocalTec Communications Inc.

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A voice engine is a software subsystem for bidirectional audio communication, typically used as part of a telecommunications system to simulate a telephone.

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VoiceXML (VXML) is a digital document standard for specifying interactive media and voice dialogs between humans and computers.

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A VoIP gateway is a gateway device that uses Internet Protocols to transmit and receive voice communications (VoIP).

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A VoIP phone or IP phone uses Voice over IP technologies for placing and transmitting telephone calls over an IP network, such as the Internet, instead of the traditional public switched telephone network (PSTN).

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Voice over Internet Protocol (VoIP) recording is a subset of telephone recording or voice logging, first used by call centers and now being used by all types of businesses.

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A VoIP VPN combines voice over IP and virtual private network technologies to offer a method for delivering secure voice.

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VoLTE, an acronym for Voice over LTE, which is based on the IP Multimedia Subsystem (IMS) network, with specific profiles for control and media planes of voice service on LTE defined by GSMA in PRD IR.92.

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Web-based VoIP is the integration of voice over IP technologies into the facilities and methodologies of the World-Wide Web.

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Wi-Fi (or WiFi) is a local area wireless computer networking technology that allows electronic devices to network, mainly using the UHF and SHF ISM radio bands.

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Wireshark is a free and open-source packet analyzer.

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Extensible Messaging and Presence Protocol (XMPP) is a communications protocol for message-oriented middleware based on XML (Extensible Markup Language).

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ZRTP (composed of Z and Real-time Transport Protocol) is a cryptographic key-agreement protocol to negotiate the keys for encryption between two end points in a Voice over Internet Protocol (VoIP) phone telephony call based on the Real-time Transport Protocol.

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112 is the common emergency telephone number that can be dialed free of charge from any fixed or mobile telephone in order to reach emergency services (ambulance, fire and rescue, police) in numerous European Countries, including all member states of the European Union, as well as several other countries in the world.

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3G, short form of third generation, is the third generation of mobile telecommunications technology.

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4G, short for fourth generation, is the fourth generation of mobile telecommunications technology, succeeding 3G and preceding 5G.

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9-1-1 is the emergency telephone number for the North American Numbering Plan (NANP), one of eight N11 codes.

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References

[1] https://en.wikipedia.org/wiki/Voice_over_IP

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