OpenSIPS is a GPL licensed SIP server implementation. It started as a fork of Fokus Fraunhofer SIP Express Router (SER) project. OpenSIPS wants to be a more open project, not only from license point of view, but more open as project management, especially for external contributions.

OpenSIPS wants to overcome the development latency of current SER project, to ensure a shorter path into a release for new added features. OpenSIPS is a project maintained by OpenSIPS Solutions http://www.opensips-solutions.com/ by a team including core and main developers of SER project.

For information regarding the OpenSIPS installation, please see the INSTALL file.

For current developers/contributors of this project, see the CREDITS and AUTHORS file. For complete license information, please see the COPYING file. For an overview of OpenSIPS modules, a modules listing is available on the opensips.org website.

Documentation about each module can be found in the README file in each module directory. For online documentation, please see https://opensips.org/Resources/Documentation

For additional documentation, tutorials and examples please see also https://opensips.org/Resources/DocsTutorials

For any question related to the OpenSIPS usage, please use the users@lists.opensips.org public mailing list.

For questions regarding the development of OpenSIPS - like contributions, bug reports, etc - please use the devel@lists.opensips.org public mailing list.

For questions regarding businesses around OpenSIPS - like products,· consultancy, trainings, etc - please use the business@lists.opensips.org public mailing list.

Also there is a generic news mailing list where you can learn about what is· new or important for the OpenSIPS project, about alerts and updates regarding relaces and about events around the project. news@lists.opensips.org