Unified Communications Definitions

This glossary explains the meaning of key words and phrases that information technology (IT) and business professionals use when discussing unified communications and related software products. You can find additional definitions by visiting WhatIs.com or using the search box below.

  • Q

    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).

  • 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).

  • QoS (quality of service)

    Quality of service (QoS) refers to any technology that manages data traffic to reduce packet loss, latency and jitter on the network.

  • R

    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.

  • 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)

  • real-time communications (RTC)

    Real-time communications (RTC) is any mode of telecommunications in which all users can exchange information instantly or with negligible latency. In this context, the term "real-time" is synonymous with "live." (Continued)

  • 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 instantly or with negligible latency... (Continued)

  • Real-Time Transport Control Protocol (RTCP)

    Real-Time Transport Control Protocol (RTCP) is a protocol that works with Real-Time Protocol (RTP) to monitor data delivery on large multicast networks, mainly for streaming media, telephony and video conferencing.

  • 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 System or "Ma Bell") by a U.S. Federal Court consent decree on December 31, 1983. The seven original regional Bell operating companies were Ameritech, Bell Atlantic, BellSouth, NYNEX, Pacific Bell, Southwestern Bell, and US WEST. Each of these companies owned at least two Bell operating companies (Bell operating company).

  • 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 tracking of the status of all users.

  • 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)

  • RoundTable

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

  • S

    scalable video coding (SVC)

    Scalable video coding (SVC) is an extension of the H.264 (MPEG-4 AVC) video compression standard for video encoding.

  • 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 along with a series of interactions among them... (Continued)

  • Session Announcement Protocol (SAP)

    Session Announcement Protocol (SAP) is a protocol used to define the format and describe the information that will be exchanged during a multicast conferencing session. 

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