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  • rich presence technology (RPT)

    Rich presence is an enhanced form of presence awareness in which participants can determine if other users are online and if so, observe to a limited extent what they are doing and how they are doing it... (Continued) Continue Reading

  • Videoconferencing tutorial

    Videoconferencing is becoming an increasingly viable tool in the corporate world. Better technology, green IT initiatives and cuts in company travel budgets have contributed to the rise of videoconferencing as a collaborative solution. This ... Continue Reading

  • real-time communications dashboard (RTCD)

    A real-time communications dashboard (RTCD) is an application designed to facilitate efficient, convenient real-time communications (RTC) in a business environment. RTC is any mode of telecommunications in which all users can exchange information ... Continue Reading

  • presence leveraging

    Presence leveraging refers to any technology that supports and expands presence, the ability of a network subscriber to locate and identify any other user's computing device as soon as the other user connects to the network... (Continued) Continue Reading

  • real-time application (RTA)

    A real-time application (RTA) is an application program that functions within a time frame that the user senses as immediate or current. The latency must be less than a defined value, usually measured in seconds... (Continued) Continue Reading

  • SIP tutorial

    Session Initiation Protocol (SIP) is becoming the signalling protocol of choice in the IP telephony, VoIP and unified communications (UC) industries. This comprehensive tutorial details the ins and outs of basic SIP operation, security, ...Continue Reading

  • Intro to SIP packet routing: Using the SIP route header and via header

    In the last of a series of three tips introducing the basics of the Session Initiation Protocol (SIP), Brien Posey discusses the four types of headers SIP employs to ensure that information packets travel the correct path when communicating between ...Continue Reading

  • An introduction to SIP verbs: Register, subscribe, invite

    Part 2 of a three part series on the Session Initiation Protocol, this article discusses commonly used SIP codes and response verbs, and explains basic SIP operation.Continue Reading

  • An introduction to SIP and SIP functions

    The Session Initiation Protocol (SIP) is the primary protocol that's used by most VoIP and unified communications (UC) products. This is part 1 of a three-part series that will explain how SIP works.Continue Reading

  • SDP (Session Description Protocol)

    SDP (Session Description Protocol) is a set of rules that defines how multimedia sessions can be set up to allow all end points to effectively participate in the session. In this context, a session consists of a set of communications end points ...Continue Reading

  • CoIP (communications over Internet Protocol)

    CoIP (communications over Internet Protocol) is a set of standards defining the transmission of multimedia over the Internet. CoIP can be considered an expansion of VoIP (voice over Internet Protocol) to include text, images, video and other forms ...Continue Reading

  • .Tel

    .Tel is a top-level domain (TLD) intended for universal text naming and navigation in Internet-based communications... (Continued)Continue Reading

  • H.245

    H.245 is a protocol for the transmission of call management and control signals in packet-based networks using H.323 equipment.Continue Reading

  • media gateway

    A media gateway is any device, such as a circuit switch, IP gateway, or channel bank that converts data from the format required for one type of network to the format required for another.Continue Reading

  • call control

    Call control is a process that is used in telecommunications networks to monitor and maintain connections once they have been established.Continue Reading

  • call signaling

    Call signaling is a process that is used to set up a connection in a telephone network.Continue Reading

  • call deflection

    Call deflection is a feature of voice over IP (VoIP) that automatically redirects a call from the called endpoint to another endpoint (usually a voice mailbox) when the called endpoint is busy.Continue Reading

  • call detail record (CDR)

    A call detail record (CDR) in voice over IP (VoIP) is a file containing information about recent system usage such as the identities of sources (points of origin), the identities of destinations (endpoints), the duration of each call, the amount ...Continue Reading

  • dial peer (addressable call endpoint)

    A dial peer, also known as an addressable call endpoint, is a device that can originate or receive a call in a telephone network.Continue Reading

  • dial peer hunting

    Dial peer hunting is a feature of voice over IP (VoIP) systems in which the device at the originating router attempts to find an alternative addressable call endpoint if it cannot establish a connection to the intended endpoint.Continue Reading

  • VoIP caller ID (Voice over Internet Protocol caller identification)

    VoIP caller ID (Voice over Internet Protocol caller identification) is a caller ID application for VoIP phones that works in much the same way as caller ID on a conventional telephone line but with enhanced features and flexibility... (Continued)Continue Reading

  • call admission control (CAC)

    Call admission control (CAC) is the practice or process of regulating traffic volume in voice communications, particularly in wireless mobile networks and in VoIP (voice over Internet Protocol, also known as Internet telephony)... (Continued)Continue Reading

  • ZRTP (Zimmermann Real-Time Transport Protocol)

    ZRTP is an extension of the Real-Time Transport Protocol (RTP) that describes a method of generating cryptographic keys for enhanced communications security and privacy... (Continued)Continue Reading

  • telegraph

    A telegraph is a system in which information is communicated over a wire with a series of electrical current pulses, usually in the form of Morse code. The basic components include a source of direct current, a length of wire or cable, and a ...Continue Reading

  • VoIP trunk gateway

    A VoIP trunk gateway is an interface that facilitates the use of plain old telephone service (POTS) equipment, such as conventional phone sets and fax machines, with a voice over IP (VoIP) network.Continue Reading

  • tcpdump

    Tcpdump is an open source command-line tool for monitoring (sniffing) network traffic.Continue Reading

  • E911 (Enhanced 911)

    In the United States, E911 (Enhanced 91 is support for wireless phone users who dial 911, the standard number for requesting help in an emergency.Continue Reading

  • registration, admission, and status (RAS)

    Registration, admission, and status (RAS) is a component of a network protocol that involves the addition of (or refusal to add) new authorized users, the admission of (or refusal to admit) authorized users based on available bandwidth, and the ...Continue Reading

  • Optivity Telephony Manager (OTM)

    Optivity Telephony Manager (OTM) is an application that provides single-point analysis, configuration, and management of telephony networks using a Web browser or graphical user interface (GUI).Continue Reading

  • podcasting

    Podcasting is the preparation and distribution of audio files using RSS to the computers of subscribed users. These files may then be uploaded to digital music or multimedia players like the iPod. A podcast can be easily created from a digital ...Continue Reading

  • SPIT (spam over Internet telephony)

    SPIT (spam over Internet telephony), sometimes known as vam (voice or VoIP spam), is unsolicited bulk messages broadcast over VoIP (Voice over Internet Protocol) to phones connected to the Internet.Continue Reading

  • hop off

    Hop off is a term used in telecommunications that refers to a point at which a signal or call leaves a network and moves to another network.Continue Reading

  • Skinny Client Control Protocol (SCCP)

    Skinny Client Control Protocol (SCCP) is a Cisco proprietary standard for terminal control for use with voice over IP (VoIP).Continue Reading

  • presence technology

    Presence technology is a type of application that makes it possible to locate and identify a computing device wherever it might be, as soon as the user connects to the network... (Continued)Continue Reading

  • long-distance carrier

    A long-distance carrier is a telephone company that provides connections between local exchanges in different geographic areas.Continue Reading

  • Carrier Sensitive Routing (CSR)

    Carrier Sensitive Routing (CSR) is a network solution that allows Voice over Internet Protocol (VoIP) subscribers to determine and manipulate the routing of individual calls... (Continued)Continue Reading

  • hairpinning

    In general telecommunication, hairpinning is returning a message from an origin endpoint back in the direction it came from as a way to get it to its destination endpoint.Continue Reading

  • teleconference

    A teleconference is a telephone meeting among two or more participants involving technology more sophisticated than a simple two-way phone connection.Continue Reading

  • Signalling Connection Control Part (SCCP)

    Signalling Connection Control Part (SCCP) is a portion of International Telecommunication Union (ITU) recommendation Q.711, which is the routing protocol for Signalling System 7 (SS7), a set of protocols used to set up calls in telephony networks.Continue Reading

  • hop on

    In telecommunications, hop on refers to a point at which a signal or call enters a network from another network.Continue Reading

  • Premium Rate Service (PRS)

    In the U.K., Premium Rate Service (PRS) is a telephone service that provides recorded information or live conversation for callers similar to 1-900 number service in the U.S. Callers are charged a higher rate on their phone bill, which is then split...Continue Reading

  • hundred call second or centum call second (CCS)

    The hundred call second -- also known as the centum call second (CCS) -- is a unit of telecommunications traffic density that is the equivalent of one call (including call attempts and holding time) in a specific channel for 100 seconds in an hour.Continue Reading

  • jitter buffer

    In voice over IP (VoIP), a jitter buffer is a shared data area where voice packets can be collected, stored, and sent to the voice processor in evenly spaced intervals.Continue Reading

  • ILEC (incumbent local exchange carrier)

    An ILEC (incumbent local exchange carrier) is a telephone company in the U.S. that was providing local service when the Telecommunications Act of 1996 was enacted.Continue Reading

  • centrex (central office exchange service)

    Centrex (central office exchange service) is a service from local telephone companies in the United States in which up-to-date phone facilities at the phone company's central (local) office are offered to business users so that they don't need to ...Continue Reading

  • VoiceXML

    VoiceXML is an application of the Extensible Markup Language (XML) which, when combined with voice recognition technology, enables interactive access to the Web through the telephone or a voice-driven browser.Continue Reading

  • IP PBX (private branch exchange)

    An IP PBX is a private branch exchange (telephone switching system within an enterprise) that switches calls between VoIP (voice over Internet Protocol or IP) users on local lines while allowing all users to share a certain number of external phone ...Continue Reading

  • ear and mouth (E&M)

    Ear and mouth (E&M) is a technology in voice over IP (VoIP) that uses a traditional telephone handset with an earphone (or earpiece) for listening to incoming audio and a microphone (or mouthpiece) for transmitting audio.Continue Reading

  • virtual phone number

    A virtual phone number is a telephone number is used to route calls to the user's actual phone number or numbers.Continue Reading

  • regional Bell operating company (RBOC)

    Regional Bell operating company (RBOC) is a term describing one of the U.S. regional telephone companies (or their successors) that were created as a result of the breakup of American Telephone and Telegraph Company (AT&T, known also as the Bell...Continue Reading

  • R-value

    R-value is a number, or score, that is used to quantitatively express the subjective quality of speech in communications systems, especially digital networks that carry voice over IP (VoIP) traffic, or for which VoIP service is under consideration.Continue Reading

  • greenfield deployment

    In networking, a greenfield deployment is the installation and configuration of a network where none existed before, for example in a new office.Continue Reading

  • Q.931

    Q.931 (also called Q93 is a signaling protocol for Integrated Services Digital Network (ISDN) communications that is used in voice over IP (VoIP).Continue Reading

  • Q signaling (QSIG)

    Q signaling (abbreviated QSIG), a protocol for Integrated Services Digital Network (ISDN) communications based on the Q.931 standard, is used for signaling between digital private branch exchanges (PBXs).Continue Reading

  • keyphone (K/P or key station)

    Commonly used by a company within its private automatic branch exchange (PABX) telephone system, a keyphone (abbreviated as K/P, sometimes called a key station) is a telephone with the extra buttons and the intelligence to allow incoming calls to be...Continue Reading

  • streaming video

    Streaming video is content sent in compressed form over the Internet and displayed by the viewer in real time.Continue Reading

  • Vonage

    Vonage is a communication platform as a service (CPaaS) provider for consumers and businesses that makes it possible for customers to connect and communicate on any device through cloud-hosted voice, video, chat and short message service (SMS).Continue Reading

  • softphone (soft client telephone)

    A softphone (software telephone) is an application program that enables voice over Internet Protocol (VoIP) telephone calls from computing devices. In the enterprise, softphones are sometimes referred to as soft clients.Continue Reading

  • National Call Fee Access (NCFA)

    In the U.K., National Call Fee Access (NCFA) is a Number Translation Service (NTS) that enables a caller that calls a non-geographic telephone number beginning with 0870 or 0871 to be charged what is known as the national call rate.Continue Reading

  • vomit

    Vomit (spelled all lower-case) is a Unix software utility that takes IP telephony packets captured by another Unix tool, tcpdump, and reassembles them into a Wave file that can be listened to over a computer's speakers.Continue Reading

  • video telephony

    Video telephony is full-duplex, real-time audio-visual communication between or among end users.Continue Reading

  • voice activation detection (VAD)

    In Voice over IP (VOiP), voice activation detection (VAD) is a software application that allows a data network carrying voice traffic over the Internet to detect the absence of audio and conserve bandwidth by preventing the transmission of "silent ...Continue Reading

  • CLEC (competitive local exchange carrier)

    In the United States, a CLEC (competitive local exchange carrier) is a telephone company that competes with the already established local telephone business by providing its own network and switching.Continue Reading

  • dedicated line

    A dedicated line is a telecommunications path between two points that is available 24 hours a day for use by a designated user (individual or company).Continue Reading

  • layer 3

    Layer 3 refers to the Network layer of the commonly-referenced multilayered communication model, Open Systems Interconnection (OSI).Continue Reading

  • Internet Protocol

    The Internet Protocol (IP) is the method or protocol by which data is sent from one computer to another on the Internet.Continue Reading

  • Indefeasible Right of Use (IRU)

    In telecommunications, Indefeasible Right of Use (IRU) is the effective long-term lease (temporary ownership) of a portion of the capacity of an international cable.Continue Reading

  • RoundTable

    Microsoft RoundTable is a videoconference device designed to simulate in-person meetings... (Continued)Continue Reading

  • zenware

    Zenware refers to application programs that function with a minimum of superfluous user intervention... (Continued)Continue Reading

  • vishing (voice or VoIP phishing)

    Vishing is an electronic fraud tactic in which individuals are tricked into revealing critical financial or personal information to unauthorized entities... (Continued)Continue Reading

  • hyperconnectivity

    Hyperconnectivity is a state of unified communications (UC) in which the traffic-handling capacity and bandwidth of a network always exceed the demand... (Continued)Continue Reading

  • click-to-talk (CTC)

    Click-to-call (CTC), also called click-for-talk, is a technology that converts Web traffic into voice telephone connections using VoIP (Voice over IP)...(Continued)Continue Reading

  • VoIP certification credentials

    In this Voice over IP (VoIP) certification survey, we take a look at available certifications that IT pros can obtain to perfect their voice skills.Continue Reading

  • Hosted and managed VoIP fundamentals

    Adoption rates of hosted VoIP and managed VoIP are increasing as more companies look to reduce the costs and complexities of deploying VoIP in house. Enterprises are factoring revenue growth, enhanced productivity and communication services into ROI...Continue Reading

  • VoIP models and services: Complete guide

    With clear, concise explanations of existing VoIP business models and deployment methodologies, this guide will enable you to weigh the pros and cons of each based on your needs.Continue Reading

  • off-peak

    Off-peak, in a call center context, describes a time period with fewer calls than are handled in a busy period... (Continued)Continue Reading

  • inbound call

    An inbound call is one that a customer initiates to a call center or contact center... (Continued)Continue Reading

  • outbound call center

    An outbound call center is one in which call center agents make outbound calls to customers on behalf of a business or client... (Continued)Continue Reading

  • inbound call center

    An inbound call center is one that exclusively or predominately handles inbound calls (calls initiated by the customer) rather than outbound calls... (Continued)Continue Reading

  • Erlang C

    Erlang C is a traffic modeling formula used in call center scheduling to calculate delays or predict waiting times for callers... (Continued)Continue Reading

  • Erlang B

    Erlang B is a modeling formula that is widely used in call center scheduling... (Continued)Continue Reading

  • IAX (Inter-Asterisk Exchange Protocol)

    IAX (Inter-Asterisk Exchange Protocol, pronounced "eeks") is a communications protocol for setting up interactive user sessions... (Continued)Continue Reading

  • packet loss concealment (PLC)

    Packet loss concealment (PLC) is a technology designed to minimize the practical effect of lost packets in digital communications... (Continued)Continue Reading

  • VoIP on MPLS

    While MPLS technology has been around for several years, businesses are now taking advantage of service provider offerings and beginning their own corporate implementations. It's a good idea for network architects and engineers to get a head start ...Continue Reading

  • G.723.1

    G.723.1 is a standard for digital communications that employs 16-bit pulse-code modulation (PCM) at 5.3 or 6.3 kilobits per second (Kbps) with an input sample rate of 8 kilohertz (kHz)... (Continued)Continue Reading

  • virtual call center

    A virtual call center is a call center in which the organization's representatives are geographically dispersed, rather than being situated at work stations in a building operated by the organization.Continue Reading

  • voice logger

    A voice logger is a device or program used to record audio information from telephones, radios, microphones and other sources for storage on a computer's hard drive or removable media.Continue Reading

  • What's in a VoIP packet -- An introduction to bandwidth for VoIP

    Learn what makes up a VoIP packet, how headers work, what protocols transport voice traffic over the Internet and how this traffic uses network bandwidth.Continue Reading

  • Learning guide: VoIP protocols and standards

    The Israelis are credited with placing the first computer-to-computer call in 1995. Though the audio quality was poor and likened to the "voice sounds" that were transmitted during the first historical call made in 1875 by Alexander Graham Bell, ...Continue Reading

  • Quiz: Do you really know VoIP?

    Do you know how VoIP works? Put yourself to the test.Continue Reading

  • The Dickens you say!

    For a little geeky and festive fun, try our new quiz, What the Dickens! In which, Dear Reader, we ask the techy questions and then supply hints from the text of Charles Dickens' seasonal classic, "A Christmas Carol."Continue Reading

  • VoIP Learning Guide

    This guide explains what VoIP is, how it's used, and how it fits into the enterprise. Check back often for updates and new additions.Continue Reading

  • Introduction to Internet telephony

    This is the first tip in a series excerpted from a report by Ohio State University. The report analyzes issues and challenges in the evolving VoIP technology.Continue Reading

  • Learn IT: Instant Messaging in the Workplace

    Here's how it works: We give you a little background about the concept, a glossary to look up related terms, some outside reading, and a self-assessment quiz.Continue Reading

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