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+/* $Id$ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+
+
+/**
+@defgroup PJNATH_STUN STUN: Session Traversal Utilities for NAT
+@ingroup PJNATH
+@brief Open source STUN library
+ */
+
+/**
+@defgroup PJNATH_STUN_SOCK STUN-aware socket transport
+@brief STUN aware UDP socket transport
+@ingroup PJNATH_STUN
+ */
+
+
+/**
+@defgroup PJNATH_STUN_SESSION STUN session
+@brief STUN client and server session
+@ingroup PJNATH_STUN
+ */
+
+/**
+@defgroup PJNATH_STUN_BASE Base STUN objects
+@ingroup PJNATH_STUN
+@brief STUN data structures, objects, and configurations
+
+These section contains STUN base data structures as well as
+configurations. Among other things it contains STUN message
+representation and parsing, transactions, authentication
+framework, as well as compile-time and run-time configurations.
+*/
+
+
+/**
+@addtogroup PJNATH_STUN
+
+This module contains implementation of STUN library in PJNATH -
+the open source NAT helper containing STUN and ICE.
+
+\section stun_org_sec Library organizations
+
+The STUN part of PJNATH consists of the the following sections (see
+<b>Table of Contents</b> below).
+
+
+\section stun_using_sec Using the STUN transport
+
+The \ref PJNATH_STUN_SOCK is a ready to use object which provides 
+send and receive interface for communicating UDP packets as well as
+means to communicate with the STUN server and manage the STUN mapped
+address.
+
+Some features of the \ref PJNATH_STUN_SOCK:
+ - API to send and receive UDP packets,
+ - interface to query the STUN mapped address info, 
+ - multiplex STUN and non-STUN incoming packets and distinguish between
+   STUN responses that belong to internal requests with application data
+   (the application data may be STUN packets as well),
+ - resolution of the STUN server with DNS SRV query (if wanted), 
+ - maintaining STUN keep-alive, and 
+ - handle changes in STUN mapped address binding.
+
+Please see \ref PJNATH_STUN_SOCK for more information.
+
+
+\section stun_advanced_sec Advanced use of the STUN components
+
+The rest of the STUN part of the library provides lower level objects
+which can be used to build your own STUN based transport or
+protocols (officially called STUN usages). These will be explained 
+briefly below.
+
+
+\subsection stun_sess_sec The STUN session
+
+A STUN session is interactive information exchange between two STUN 
+endpoints that lasts for some period of time. It is typically started by
+an outgoing or incoming request, and consists of several requests, 
+responses, and indications. All requests and responses within the session
+typically share a same credential.
+
+The \ref PJNATH_STUN_SESSION is a transport-independent object to
+manage a client or server STUN session. It is one of the core object in
+PJNATH, and it is used by several higher level objects including the 
+\ref PJNATH_STUN_SOCK, \ref PJNATH_TURN_SESSION, and \ref PJNATH_ICE_SESSION.
+
+The \ref PJNATH_STUN_SESSION has the following features:
+   - transport independent
+   - authentication management
+   - static or dynamic credential
+   - client transaction management
+   - server transaction management
+
+For more information, including how to use it please see 
+\ref PJNATH_STUN_SESSION.
+
+
+\subsection stun_extending_sec Extending STUN to support other usages
+
+At present, the STUN subsystem in PJNATH supports STUN Binding, TURN, and
+ICE usages. If other usages are to be supported, typically you would need
+to add new STUN methods (and the corresponding request and response message
+types), attributes, and error codes to \ref PJNATH_STUN_MSG subsystem of
+PJNATH, as well as implementing the logic for the STUN usage.
+
+
+\section stunsamples_sec STUN samples
+
+The \ref turn_client_sample sample application also contains sample
+code to use \ref PJNATH_STUN_SOCK. 
+
+Also see <b>\ref samples_page</b> for other samples.
+
+
+ */
+