H 323 - définition. Qu'est-ce que H 323
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Qu'est-ce (qui) est H 323 - définition

COMMUNICATIONS PROTOCOL
H.225.0; H.225; H.323 Gateway; Registration, Admission and Status; H323; H.323 protocol
  • Figure 5 - A typical H.245 exchange
  • Figure 3 - Establishment of an H.323 call
  • Figure 2 - An illustration of an administrative domain with border elements, peer elements, and gatekeepers
  • Figure 4 - A high-level communication exchange between two endpoints (EP) and two gatekeepers (GK)
  • Figure 1 - A complete, sophisticated protocol stack

H.323         
<communications, standard> The ITU-T standard for sending voice (audio) and video using IP on a LAN without QoS. H.323 includes Q.931 for call setup, H.225 for call signalling, H.245 for exchanging terminal capabilities, RTP/RTCP for packet streaming, G.711/G.712 for CODECs, and several other protcols, many of which need to be negotiated to setup a simple voice call. The complexity of H.323 has lead to the IETF proposing the simpler alternatives SIP and MGCP/Megaco. (2003-11-30)
Macchi M.B.323         
1952 ITALIAN SINGLE-ENGINE BASIC TRAINING MONOPLANE
Macchi MB.323; Macchi MB-323
The Macchi MB.323 was an Italian single-engine basic training monoplane designed and built by Macchi.
Bramo 323         
9-CYLINDER RADIAL PISTON AIRCRAFT ENGINE
Bramo 323R; Bramo 323 Fafnir; Siemens Bramo 323 Fafnir; BMW-Bramo 323A; BMW Bramo 323R-2 Fafnir; BMW-Bramo 323P Fafnir; Bramo 323A-1 Fafnir; BMW Bramo 323D-2; Bramo 323R-2 Fafnir; Bramo 301R-3; BMW-Bramo 323 R-2 Fafnir; Bramo 323R-2; Bramo 323B; Bramo 323A
The Bramo 323 Fafnir is a nine-cylinder radial aircraft engine of the World War II era. Based heavily on Siemens/Bramo's earlier experience producing the Bristol Jupiter under licence, the Bramo 323 saw limited use.

Wikipédia

H.323

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. The H.323 standard addresses call signaling and control, multimedia transport and control, and bandwidth control for point-to-point and multi-point conferences.

It is widely implemented by voice and videoconferencing equipment manufacturers, is used within various Internet real-time applications such as GnuGK and NetMeeting and is widely deployed worldwide by service providers and enterprises for both voice and video services over IP networks.

It is a part of the ITU-T H.32x series of protocols, which also address multimedia communications over ISDN, the PSTN or SS7, and 3G mobile networks.

H.323 call signaling is based on the ITU-T Recommendation Q.931 protocol and is suited for transmitting calls across networks using a mixture of IP, PSTN, ISDN, and QSIG over ISDN. A call model, similar to the ISDN call model, eases the introduction of IP telephony into existing networks of ISDN-based PBX systems, including transitions to IP-based PBXs.

Within the context of H.323, an IP-based PBX might be a gatekeeper or other call control element which provides service to telephones or videophones. Such a device may provide or facilitate both basic services and supplementary services, such as call transfer, park, pick-up, and hold.