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1. Introduction


1.1 About

OpenSBC is an ongoing attempt to create an open-source Session Border Controller that is fully compliant with the mandates of RFC 3261.   OpenSBC can be used as a SIP router, media anchor for far-end NAT traversal, SIP egress and ingress trunking among others.  OpenSBC functionalities are as follows

Current Functionalities:
Future Functionalities

1.2 Copyright

OpenSBC is published under the MPL, GPL, LGPL tripple license.  The default active license is MPL.  However, because of the inherent incompatibility between MPL and GNU licenses, we decided to explicitly publish OpenSBC using GPL and LGP as alternative licenses.  The full text of the license is as follows

 * Copyright (c) opensipstack.org.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either expressed or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is OpenSIPStack.
 *
 * The Initial Developer of the Original Code is opensipstack.org.
 *
 * The author of this code is Joegen E. Baclor
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * The OpenSIPStack Library includes some GPL/LGPL code libraries that MAY be
 * enabled at compile time using the --enable-gpllibs configure switch.  If
 * enabled, the content of this file is published under the terms of GNU
 * General Public License Version 2.  For a detailed list of the available
 * GPL code, see $(opensipstack)/gnu/README file.


1.3 Download

The latest development releases and binaries can be downloaded at the following locations
1.4 Mailing list and Forums

A Source Forge Mailing List is dedicated to discussing OpenSIPStack Development including OpenSBC 
Forums are hosted in Open Source SIP website

1.5 Sponsors

The chief architect and coordinator of the OpenSBC project is Joegen E. Baclor.
Solegy Systems sponsored the main functionalities of OpenSBC.
Ryan Colobong is a Solegy Architect dedicated to work on OpenSBC.



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