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OpenH323

OpenH323 is an open-source implementation of the H.323 protocol used for internet videoconferencing. Developed in C++, it supports G.711 and GSM audio codecs along with H.261 video codec. The architecture includes various components such as Multipoint Control Units (MCUs), endpoints, and gatekeepers, facilitating efficient video and audio communication. Notably, OpenH323 features both graphical and command-line interfaces through applications like OpenPhone and OhPhone. It's entirely free to use, allowing for the development of commercial products, and can be accessed at www.openh323.org.

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OpenH323

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  1. OpenH323 Open source internet videoconferencing Jeremy Medow Presented to: Dr. Dennis Anderson and team 6/10/02 www.openh323.org

  2. OpenH323 General Information Protocol Language Codecs

  3. OpenH323 • Based on the H.323 protocol • Same protocol used by • Microsoft Netmeeting • Many standalone videoconferencing units • Developed by the ITU (www.itu.int) • Most recent accepted protocol Protocol

  4. OpenH323 • Written in C++ • Entirely open source • Any or all of the program can be used freely • Code can be downloaded from http://www.openh323.org/code.html. • If the openh323 library is used strictly as a library, a commercial product can be produced Language

  5. OpenH323 • Codecs • Supports G.711 and GSM audio codecs • Supports H.261 video codec Codecs

  6. OpenH323 Capabilities Programs Interfaces Platforms

  7. OpenH323 • OpenPhone, OhPhone • Endpoint clients • OpenMCU • Multipoint control unit • OpenGK • Gatekeeper • Others • Answering machine, gateway, etc. Programs

  8. OpenH323 • GUI • OpenPhone has a graphical user interface • More user friendly • Command Line • OhPhone has a command line interface • More flexible, powerful Interfaces

  9. OpenH323 • GUI client for Windows • OpenPhone • Command line client for Windows, Linux • OhPhone • MCU, Gateway for all platforms • OpenMCU, PSTNGw Platforms

  10. OpenH323 H.323 Details Architecture Multipoint Streams Channels

  11. OpenH323 • Terminals • Client endpoints: interface, etc. • Gateways (optional) • Translation, call setup • Gatekeepers • Call control, Bandwidth management, routing • Multipoint Control Units • Manage 3+ endpoint communications Architecture

  12. OpenH323 • MCU is actually two components • MC (Multipoint Controller) • Deals with connection protocols • Chooses stream (audio/video/data) destinations • MP (Multipoint Processor) • Mixes/switches streams • Transmits streams to appropriate destinations • MCU can be standalone or embedded within endpoints Multipoint

  13. OpenH323 • Types of multipoint control • Centralized • All streams are sent to MCU • MC manages streams • MP mixes, distributes streams • Decentralized • Audio, Video are multicast to, from all endpoints • Data, call control information sent to MCU • Hybrid • Mix of Centralized and Decentralized Multipoint (cont’d)

  14. OpenH323 • Control • H.245: Capabilities, channel management • Q.931: Establishes connections • RAS: Bandwidth changes, status, disengage • Audio • G.771: Voice compression • Video • H.261: Video codec (H.263 possible) • Data (Whiteboard, data sharing, file transfer) • T.120: Can be used by endpoints, mixed by MCU Streams

  15. OpenH323 • Two channels • Reliable (TCP): Accurate • Control channel (H.245) • T.120 Data channel • Call signaling channel (Q.931) • Unreliable (UDP): Faster • Audio stream • Video stream • RAS channel (only with gatekeeper) Channels

  16. OpenH323 More Information OpenH323 H.323 details

  17. OpenH323 • www.openh323.org • Information on OpenH323 • Capabilities, updates • Licensing details • Downloads • Source code (C++) • Executables • Links • Information on H.323 OpenH323

  18. OpenH323 • www.packetizer.com/iptel/h323 • Papers & Presentations • An H.323 primer • Multipoint information • General information • Links H.323 details

  19. OpenH323 Open source internet videoconferencing www.openh323.org

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