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OpenH323

OpenH323. Open source internet videoconferencing. Jeremy Medow Presented to: Dr. Dennis Anderson and team 6/10/02. www.openh323.org. OpenH323. General Information. Protocol Language Codecs. OpenH323. Based on the H.323 protocol Same protocol used by Microsoft Netmeeting

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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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