A standard approved by the International Telecommunications Union (ITU), the H.323 communications standard supports videoconferencing and Voice over Internet Protocol (VoIP). Theoretically, all devices using the H.323 standard can communicate with each other.

Video teleconferencing standard defining how conferencing data is to be sent over IP networks, including the Internet.

An ITU-T standard for packet-based multimedia communications systems. This standard defines the different multimedia entities that make up a multimedia system - Endpoint, Gateway, Multipoint Conferencing Unit (MCU), and Gatekeeper - and their interaction. This standard is used for many voice-over-IP applications, and is heavily dependent on other standards, mainly H.225 and H.245.

H.323 is an ITU standard for the usage of multimedia communication via packet-oriented networks that guarantees the interoperability between different equipment vendors. It defines how audiovisual conferencing data is transmitted across networks. The largest packet-oriented network is the Internet but also WAN, ISDN or dialup connections on which data is transported in packets (e.g. PPP) belong into this group. H.323 describes the general infrastructure and the utilization of different speech coders and protocol signaling stacks. The speech coders are defined in their respective sub standards, e.g. G.711 (Alaw and ulaw used in ISDN), G.722, G.723.1 and G.729.A for speech encoding. H.323 is definitely among the most widely deployed and mature standards.

Edit / H.323 is the name given to a set of communications protocols used by programs such as Microsoft NetMeeting to transmit audio and video information over the Internet. It was developed by the ITU ( http://www.itu.int), an international standards body for telecommunications. For an open implementation of H.323 see www.openh323.org/ See Also: ITU SIP

This is an ITU (International Telecommunications Union) umbrella standard that is used to describe multimedia communications systems over IP based network infrastructures. In Video Conference terms it is used as to describe video conferencing over IP networks

An ITU standard for real-time interactive voice and videoconferencing over LANs and the Internet.

A standard for video conferencing technique

International video conferencing standard with wide support. Developed in the communications industry and allows for point to point [users dial up other users as you would for a telephone call] and multipoint video conferencing [participants connect to a common address at a MCU, multipoint control unit which reflects all video streams in a ìHollywood Squaresî style].

H.323 extends H.320 to Ethernet, Token-Ring, and other packet-switched networks that don't guarantee Quality of Service (QoS). See QoS.

Videoconferencing standard ratified in 1996, which describes how to transmit voice and video data over the local area and wide area networks using TCP/IP as the transmission protocol. H.323 has the promise to significantly reduce the cost of desktop video connections and enable videoconferencing to become another LAN application. [Source: York Telecom

H.323 is a standard approved by the International Telecommunication Union (ITU) in 1996 to promote compatibility in videoconference transmissions over IP networks. H.323 was originally promoted as a way to provide consistency in audio, video and data packet transmissions in the event that a local area network (LAN) did not provide guaranteed service quality (QOS). Although it was doubtful at first whether manufacturers would adopt H.323, it is now considered to be the standard for interoperability in audio, video and data transmissions as well as Internet phone and voice- over-IP (VoIP) because it addresses call control and management for both point-to-point and multipoint conferences as well as gateway administration of media traffic, bandwidth and user participation.

An extension of H.320, H.323 is a standard for transmission of real-time audio, video, and data across packet-based networks (usually IP, IPX, LAN, EN, MAN, or WAN). H.323 standardizes the multimedia components, protocols, and procedures across these networks. Version 2 of H.323 was introduced in 1998 to allow for compatibility with VoIP (voice-over-IP) applications.

An ITU-T recommendation which consists of a set of signaling and media format specifications for multimedia communications over packet networks. The most prominent application of H.323 is in IP Telephony (VoIP). Also see VoIP.

ITU standard for videoconferencing over networks that do not guarantee bandwidth, such as the Internet. H.323 is the standard that this cookbook is recommending that most users in the education community should be using.

A multimedia protocol for video, voice and data over IP as standardized by the International Telecommunication Union (ITU).

ITU standard on Visual telephone systems and equipment for local area networks which provide a non guaranteed quality of service Used in IP videoconferencing

an umbrella standard for audio/video conferencing over unreliable networks; architecture and procedures are covered by this standard; H.323 relies on H.225 and H.245

H.323 An ITU-T suite of protocols designed for controlling multimedia communications over IP

Emerging Internet telephony standard.

H.323 is a standard that specifies the components, protocols and procedures that provide multimedia communication services-real-time audio, video, and data communications-over packet networks, including Internet protocol (IP)-based networks. H.323 is part of a family of ITU-T recommendations called H.32x that provides multimedia communication services over a variety of networks.

The global industry standard for real-time voice, video and data communication over packet-based networks such as the Internet. H.323 addresses problems inherent to packet-switched networks such as packet delay and packet loss on a Local Area Network, corporate intranets, and the Internet. The oldest of the VoIP protocols. (See SIP and MGCP)

H.323 is an umbrella recommendation from the International Telecommunications Union (ITU) that sets standards for multimedia communications over Local Area Networks (LANs) that do not provide a guaranteed Quality of Service (QoS). Copyright© 2001 Packetizer, Inc. All rights reserved.

A standard used in Video Conferencing for audio and video communication over a Local Area Network (LAN).

An umbrella recommendation from the ITU-T that outlines standards for multimedia communications over a packet network (such as the Internet). H.323 is used in VoIP. An alternative to H.323 is SIP. Back

The standard for video and voice transmission over an IP network. H.324 The standard for video and voice transmission over analog phone lines.

A standard protocol for desktop conferencing. Because Netscape Conference complies with this standard, users are able to hold real-time audioconferences with other Internet telephone users.

Video over LAN/WAN.

A protocol for real-time audio and video transmission over packet-switching networks.

Internet standard for Internet telephony Interoperability

"Visual Telephone Systems and Terminal Equipment for Local Area Networks which Provide a Non-Guaranteed Quality of Service" (ver. 2 - "Packet-based multimedia communication systems") is the summary ITU-T recommendation for standard videoconferencing with conventional local-area networks.

Is a standard developed to allow audiovisual conferencing data to be transmitted over a TCP/IP network without concern for interoperability.

ITU recommendation covering IP videoconferencing.

A communications standard that allows dissimilar communication devices to communicate with each other using a standardized communications protocol.

Used for conferencing, but over the Internet, not on ISDN.

ITU-T Recommendation describing: Visual Telephone Systems and Terminal Equipment for Local Area Networks which Provide a NON- Guaranteed Quality of Service

A VOIP protocol that was deployed early and is widely adopted. See also: IAX, MGCP, SIP, VOIP

ITU-T standard which defines multimedia systems for communication on packet based networks (IP Networks)

The umbrella ITU-T standard for narrow band videoconferencing interoperability over Local Area and Wide Area Networks (LANS, WANS).

ITU-T specification for real-time multimedia applications.

Serves as an "umbrella" for a set of standards defining real-time multimedia communications for packet based networks.

A standardized compression method and protocol for the transmission of audio, video, and data between videoconferencing codecs over IP networks, the Internet or other TCP/IP based network. This standard was implemented for and was initially used for desktop - computer to computer - videoconferencing. Recently, as bandwidth has become more available, H.323 conferencing is being implemented by many educational and other institutional organizations.

An Internet standard that allows dissimilar communication devices to communicate with each other by using a standardized communication protocol. H.323 defines a common set of CODECs, call setup and negotiating procedures, and basic data transport methods.

The standard for Videocommunications over local area networks with non-guaranteed quality of service.

H.323 is a protocol for the transmission of real-time audio, video and data information over packet switching-based networks. Gradually being superceded by SIP.

An ITU-T standard for transferring multimedia videoconferencing data over packet-switched networks, such as TCP/IP. There is a LAN standard for high-quality...

The standard that defines videoconferencing over Internet Protocol (IP). Most manufacturers that build videoconferencing systems today are compliant with H.323 protocols so that the different vendors’ systems can speak to each other over IP.

ITU standard for defining Packet based multimedia communications systems including voice and fax communications.

A standard approved by the International Telecommunication Union (ITU) that defines how audiovisual conferencing data is transmitted across networks. H.323 enables users to participate in the same videoconference even though they may be using different videoconferencing systems. This standard is most often used with Internet Protocol (IP) videoconferencing.

An ITU-T "umbrella" of standards for Packet-based multimedia communications systems. This standard defines the different multimedia entities that make up a multimedia system - Endpoints, Gateways, Multipoint Conferencing Units (MCUs), and Gatekeepers -- and their interaction. This standard is used for many Voice-over-IP applications, and is heavily dependent on other standards, mainly H.225 and H.245.

The standard call protocol for voice and videoconferencing over LANs, WANs, and the Internet, allowing these activities on a real-time basis as opposed to a packet-switched network. Initially designed to allow multimedia to function over unreliable networks, it's the oldest and most established of the VoIP protocols. See also SIP and MGCP.

H.323 is an ITU standard for the usage of multimedia communication via packet-oriented networks that guarantees the interoperability between different equipment vendors. H.323 describes the general infrastructure and the utilization of different speech coders and protocol signaling stacks. The speech coders are defined in their respective sub standards, e.g. G.711, G.723.1 and G.729.A for speech encoding. H.323 is definitely the most widely deployed and mature standard, but it is also criticized for being complicated to implement by vendors and uses a lot of resources which a not abundant (especially in terminals).

A set of International Telecommunication Union (ITU) standards that define a framework for the transmission of real-time voice communications by means of IP-based packet-switched networks. Created in response to customers who needed to use their existing IP networks to support voice communications, the H.323 standards define a gateway and a gatekeeper.

IP (Internet Protocol) videoconferencing standard MUX - See Inverse Multiplexer

A specification by the International Telecommunications Union (ITU) that defines how voice, data and video traffic will be transported over IP-based local area networks.

The H.323 extends the H.320 to Intranet, Extranet or Internet over packet-switched networks: Ethernet, Token-Ring, and others that may not guarantee QoS. It also specifies procedures for videoconferencing over ATM including ATM QoS. It supports both point-to-point and multipoint operations.

A protocol standard that provides a foundation for audio, video, and data communications across IP-based networks, including the Internet. By complying to H.323, multimedia products and applications from multiple vendors can interoperate, allowing users to communicate without concern for compatibility.

An umbrella standard from the International Telecommunications Union (ITU) that addresses call control, multimedia management, and bandwidth management for point-to-point and multi-point conferences, as well as interfaces between LANs and other networks. The most popular standard currently in use. Handheld PC (HPC): The term adopted by Microsoft and its supporters to describe handheld computers employing Microsoft's Windows CE operating system.

is a protocol for the transmission of real-time audio, video and data information over packet switching-based networks. Such networks include IP-based (including the Internet), Internet packet exchange-based local area networks, enterprise networks and metropolitan and wide area networks. H.323 can also be applied to multipoint-multimedia communications. The technology provides a vast array of services which means it can be used in consumer, business and entertainment applications. H.323 is an essential element in ensuring that the compatibility of the mobile multimedia applications and services will be introduced with the implementation of third generation wireless technologies.

Standard for audiovideo conferencing over Ethernet LANs

An ITU standard that provide a foundation for audio, video and data communications across IP-based network.

The International Telecommunication Union (ITU) standard for packet-switched network voice and video calling and signaling.

ITU standard allowing audio, video, and data to be transmitted by way of the Internet Protocol (LAN/WAN). It is the umbrella standard defining multiple codes, call control, and channel setup specifications. Basically, videoconferencing over IP.

an umbrella recommendation from the ITU–T that specifies real-time multimedia communications over protocol-compliant networks

The latest standard for video compression for videoconferencing that allows a wide variety of videoconferencing systems to communicate.

An International Telecommunication Union (ITU-T) standard that describes packet-based video, audio, and data conferencing. H.323 is an umbrella standard that describes the architecture of the conferencing system and refers to a set of other standards (H.245, H.225.0, and Q.931) to describe its actual protocol.

A standard approved by the International Telecommunication Union (ITU) that defines how audiovisual conferencing data is transmitted across networks. In theory, H.323 should enable users to participate in the same conference even though they are using different videoconferencing applications.

The H.323 extends the H.320 to IP networks or Internet over LANs: Ethernet, Token-Ring, and other packet-switched networks that do not guarantee QoS. It will support both point-to-point and multipoint operations.

An ITU-T recommendation for packet-based multimedia communications systems. This recommendation defines the different multimedia entities - Endpoint, Gateway, Multipoint Conferencing Unit (MCU) and Gatekeeper - and their interaction to compose a multimedia system. This recommendation is used for many voice-over-IP applications, and is heavily dependant on other recommendations, mainly H.225 and H.245. RADVision

A new standard for video, voice, and data communications via packet transmissions.

The ITU standard for videoconferencing over packet switched networks such as LANs and the Internet.

A framework of protocols for inter-working voice, video and data across an IP network.

An ITU-T standard for handling video, data and voice call information. This standard was originally proposed for the PictureTel system, which allowed video/voice calls, but has been enlarged to encompass many types of media devices. This "protocol" is actually a umbrella for multiple protocols, each responsible for different items such as packet format and transmission, video codecs, voice codecs, call signaling, conferencing, etc. Version 1 was formally approved in 1996 and the latest, version 4, was approved in November 2000.

H.323 is a protocol that provides audio-visual communication sessions on computer networks.

Extension of ITU-T standard H.320 that enables videoconferencing over LANs and other packet-switched networks, as well as video over the Internet.

Recommendation from the ITU that sets standards for multimedia communications over IP networks. It also addresses call control, multimedia management, and bandwidth management.

This is also a top-level standard, like H.320, for videoconference systems. The difference is that H.323 defines methods to be used on what are called packet-based networks (which are also called IP (Internet Protocol) networks) like a typical business, school LAN or the Internet.

An ITU-T standard for transmitting and controlling audio and video information. The H.323 standard requires the use of the H.225/H.245 protocol for communication control between a “gateway” audio/video endpoint and a “gatekeeper” function.

A multimedia conferencing protocol that includes voice, video, and data conferencing for use over packet-switched networks. H.323 allows dissimilar communication devices to communicate with each other by using a standardized communication protocol.

An ITU-T standard, an extension of H.320, addressing audiovisual communication on LANs, including corporate intranets and packet-switched networks. See also ITU-T.

The H.323 streaming audiovideo protocol is used by applications such as Net Meeting, TeleVox, and CuSeeMe. The Raptor Firewall can pass H.323 traffic through a standard proxy.

H.323 is an umbrella recommendation from the ITU Telecommunication Standardization Sector (ITU-T), that defines the protocols to provide audio-visual communication sessions on any packet network. It is currently implemented by various Internet real-time applications such as Net Meeting and Ekiga (the latter using the Open H323 implementation). It is a part of the H.32x series of protocols which also address communications over Integrated Services Digital Network (ISDN), Public switched telephone network (PSTN) or Signaling System 7 (SS7).