In the field of VoIP networking, the Open Phone Abstraction Library (OPAL) continues the

open-source Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use the source code, design documents, or content of the product. The open-source model is a decentralized sof ...

openh323 The OpenH323 project had as its goal the development of a full featured, open source ( MPL) implementation of the H.323 Voice over IP protocol. The code was written in C++ and, through the development effort of numerous people around the world, sup ...

project to support a wide range of commonly used protocols used to send voice, video and fax data over IP networks rather than being tied to the

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, m ...

protocol. Initially, from 2007, OPAL supported the

and

Session Initiation Protocol The Session Initiation Protocol (SIP) is a signaling protocol used for initiating, maintaining, and terminating communication sessions that include voice, video and messaging applications. SIP is used in Internet telephony, in private IP telepho ...

(SIP) protocols, but it has grown to include Asterisk IAX2.

About

OPAL implements a wide range of Voice over IP (VoIP) protocols for voice, video and fax data over IP networks. It is written in C++ and released under the Mozilla Public Licence. OPAL utilises the PTLib portable library that allows OPAL to run on a variety of platforms including Unix/Linux/BSD, MacOSX, Windows, Windows mobile and embedded systems. Opal was developed as a derivative of the

OpenH323 The OpenH323 project had as its goal the development of a full featured, open source ( MPL) implementation of the H.323 Voice over IP protocol. The code was written in C++ and, through the development effort of numerous people around the world, sup ...

library.

Applications

OPAL is used by the open source Video Conferencing Program Ekiga (formerly GnomeMeeting).

External links

Project web site

Sourceforge Project Home

Ekiga Homepage
VoIP protocols {{compu-library-stub