Development -> License

OpenSIPS is free software released under the GNU General Public License (GPL). To properly inform yourself about this license, you should take some time and check the GPL official definition at http://www.fsf.org/licenses/gpl.html. Unofficial translations can also be found at http://www.fsf.org/licenses/translations.html.

When downloading a copy of OpenSIPS, you will automatically get a copy of the license.