new_logo150.jpg (11646 bytes) Welcome to
the OpenH323 Project

line_blue.jpg (324 bytes)

 OpenH323 Home


 Frequently Asked

 Download Code

 Building code


 H.323 standards


 Mailing list
   How to join

   Primary site
   Australia #1
   Australia #2
   US #1
   US #2
   Czech Republic

 Other Sites

The OpenH323 project aims to create a full featured, interoperable, Open Source implementation of the ITU H.323 teleconferencing protocol that can be used by personal developers and commercial users without charge.

OpenH323 development is coordinated by an Australian company, Equivalence Pty Ltd, but is open to any interested party. Commercial and private use of the OpenH323 code, including use in commercial products and resale,  is enouraged through use of the MPL (Mozilla Public license).

"The aim is to `commodotise the protocol'. By giving the stack away, maybe we can stop everyone obsessing over how to format the bits on the wire, and get them writing applications instead."
Craig Southeren, co-founder of OpenH323, 1998

News updates

29 May 00 Version 1.1beta2 release. The campaign toward the first "official" release proceeds!
23 May 00 Added FAQ-O-Matic to web site for Frequently Asked Questions management.
27 Apr 00 Version 1.1beta1 release. Further stabilisation in lead up to a formal (non-beta) release.
17 Feb 00 Version 1.1alpha1 release. Transmission of video, FreeBSD support, Linux and FreeBSD video grabbers, shared librarie support. See the release notes.
4 Feb 00 Thanks to Derek Smithies, OpenH323 now supports transmission of video!
See the latest status report for more information
8 Jan 00 Release 1.0alpha2. Many bug fixes and some restructuring.
29 Dec 99 OpenH323 now supports the new Linux kernel telephony driver as created by Quicknet.
Kudos to the Quicknet team for making their drivers Open Source!

...more news


See the FAQ for the aims and targets of this project and a general introduction. Join the mailing list, or download the code. If you want to develop code with OpenH323, then read on how to join the project, and what you will need. A public CVS archive of all OpenH323 code is also available

Here is a list of people and companies who have contributed resources and web space to OpenH323 as well as those working on associated projects. If can think of anyone who should be be listed here, please contact us at

We are compiling a list of H.323 clients and other H.323 applications. Please e-mail us if you have any additions or changes.

A new page showing how to configure the Quicknet GPL drivers has been added


The latest status report is available here, along with an archive of all status reports

The current version of the code, 1.1beta1 is available, features are:

  • Dynamic threshold algorithm for silence detection
  • New GUI client (OpenPhone) for Windows.
  • Command line client for Windows, Linux & various BSD's
  • GSM full rate (06.10) and G.711 Codecs
  • Quicknet xJack support (Linux and Win32 only)
  • Voicetronics VPB4 card support (Win32 only)
  • Jitter buffering
  • Silence detection for GSM/G.711 codecs as well as Quicknet xJack based codecs..
  • H.261 video transmitter / receiver (Transmit not available on Win32 so far)
  • Gatekeeper (RAS) client support
  • Fast Start and H.245 tunnelling
  • User indication messages.
  • Shared libraries & DLL's

The "To Do" list

These are not necessarily in any order of priority:

  • H.261 transmitter for Win32
  • Dynamically adjustable jitter buffer size, based on RTP statistics.
  • Gatekeeper directory services (LRQ support).
  • Support for more telephony cards (especially high density ones).
  • H.263 support (if we can be convinced on the patent liabilities...)
  • H.450 call forwarding etc.
  • H.235 security/encryption support.
  • Multicast transport for RTP and Gatekeeper.
  • Multipoint Controller support.
  • T.120 conferencing support.

line_blue.jpg (324 bytes)

Top of page Top
Maintained by
Logo and site design by jip
Last Modified: 29 May 2000 04:46
Copyright 1998,1999,2000 by Equivalence
All Rights Reserved,