H.323 protocol definition of H.323 protocol in the Free Online Encyclopedia.

H.323

An ITU standard for real-time voice and videoconferencing over packet networks, including LANs, WANs and the Internet. Although H.323 is a very comprehensive standard that supports voice, video, data, application sharing and whiteboarding, the parts relating to audio protocols have been widely used for IP telephony applications.

H.323 defines various elements including media gateways for conversion to packets, gatekeepers for call control and multipoint control units (MCUs) for conferencing. Following are the various protocols referenced under the H.323 umbrella. See videoconferencing, codec, H.225, H.245, IP telephony, gatekeeper, SIP and MGCP/MEGACO.

   Standard   Function
   G.711      Audio codec
   G.722      Audio codec
   G.723      Audio codec
   G.728      Audio codec
   G.729      Audio codec

   H.261      Video codec
   H.263      Video codec
   H.264      Video codec

   H.225      Call control
   H.245      Control messages
   Q.931      Connection messages
   RAS        Control channel

   T.120      Data collaboration

(communications, standard)

H.323 - 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.

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No references found	RADVISION (Nasdaq:RVSN), an industry leader in providing a wide range of development solutions for voice, video, and data collaboration over IP and 3G, recently announced the general availability of its new H. RADVISION announces new H.323 toolkit V4.2, supporting advanced ... by EDP Weekly's IT Monitor 323, continues, "As a pioneer and leader in the development and implementation of the H. RADVISION DEVELOPING SESSION INITIATION PROTOCOL TECHNOLOGY by Computer Protocols 11, 2003 Call Privacy, Encryption and Denial of Service Protection Now Supported RADVISION (Nasdaq:RVSN), the industry leader in providing a wide range of development solutions for voice, video, and data collaboration over IP and 3G, today announced the general availability of its new H. RADVISION Announces New H.323 Toolkit v4.2, Supporting Advanced ... by Business Wire	H-pile H-plan H-plane bend H-plane T junction H-R diagram H-RNA H-runner H-section H. D. H.221 H.225 H.230 H.231 H.239 H.245 H.248 H.261 H.262 H.263 H.264 H.310 H.320 H.321 H.322 H.323 H.323 protocol H.324 H.350 H.460 H.B. Van Duzer Forest State Scenic Corridor H.D. H/D ratio H/PC H^ H1B H5 ha ha ha only serious Ha Ha Tonka State Park Ha Jin HA virus Ha'am, Ahad ha-ha Hašek, Jaroslav HAA Haag, Den Haakon County Haakon I Haakon IV Haakon IV Haakonsson Haakon VII	H. Weyl H. Wölfflin H.221 H.225 H.225.0 H.230 H.231 H.239 H.245 H.248 H.261 H.261 standard H.262 H.263 H.263v2 H.264 H.264/AVC H.264/MPEG-4 AVC H.310 H.320 H.321 H.322 H.323 H.323 Firewall Control Interface H.323 protocol H.324 H.350 H.460 h.a. H.A.V.I.P H.B. H.B. Stamps Memorial Library H.B. Van Duzer Forest State Scenic Corridor H.B.C. h.c. h.c. h.c. H.C. Andersen H.C. Andersen h.d. h.d. H.D. (disambiguation) H.D. (disambiguation) H.D. (disambiguation) H.D. (Hilda Doolittle) H.D. (Hilda Doolittle) H.Dip.Ed. H.F. Verwoerd H.G. Wells H.H. Munro H.H. Munro H.H. Munro H.H. Richardson H.H. Richardson H.I.

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RADVISION (Nasdaq:RVSN), an industry leader in providing a wide range of development solutions for voice, video, and data collaboration over IP and 3G, recently announced the general availability of its new H.

RADVISION announces new H.323 toolkit V4.2, supporting advanced ... by EDP Weekly's IT Monitor

323, continues, "As a pioneer and leader in the development and implementation of the H.

RADVISION DEVELOPING SESSION INITIATION PROTOCOL TECHNOLOGY by Computer Protocols

11, 2003 Call Privacy, Encryption and Denial of Service Protection Now Supported RADVISION (Nasdaq:RVSN), the industry leader in providing a wide range of development solutions for voice, video, and data collaboration over IP and 3G, today announced the general availability of its new H.

RADVISION Announces New H.323 Toolkit v4.2, Supporting Advanced ... by Business Wire

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