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diff --git a/tinyNET/src/tnet_nat.h b/tinyNET/src/tnet_nat.h
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+/*
+* Copyright (C) 2009-2010 Mamadou Diop.
+*
+* Contact: Mamadou Diop <diopmamadou(at)doubango.org>
+*	
+* This file is part of Open Source Doubango Framework.
+*
+* DOUBANGO 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 3 of the License, or
+* (at your option) any later version.
+*	
+* DOUBANGO 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 DOUBANGO.
+*
+*/
+
+/**@file tnet_nat.h
+ * @brief NAT Traversal helper functions using STUN, TURN and ICE.
+ *
+ * @author Mamadou Diop <diopmamadou(at)doubango.org>
+ *
+ * @date Created: Sat Nov 8 16:54:58 2009 mdiop
+ */
+#ifndef TNET_NAT_H
+#define TNET_NAT_H
+
+#include "tinynet_config.h"
+
+#include "stun/tnet_stun.h"
+#include "turn/tnet_turn.h"
+
+#include "tnet_proto.h"
+#include "tnet_types.h"
+
+#include "tsk_object.h"
+
+
+TNET_BEGIN_DECLS
+
+/**@ingroup tnet_nat_group
+* Estimate of the round-trip time (RTT) in millisecond.
+*/
+#define TNET_NAT_DEFAULT_RTO			500
+/**@ingroup tnet_nat_group
+* Number of retransmission for UDP retransmission in millisecond.
+/*	7.2.1.  Sending over UDP
+	Rc SHOULD be configurable and SHOULD have a default of 7.
+*/
+#define TNET_NAT_DEFAULT_RC				/*7*/3/* 7 is too hight */
+/**@ingroup tnet_nat_group
+*/
+#define TNET_NAT_TCP_UDP_DEFAULT_PORT	3478
+
+/**@ingroup tnet_nat_group
+ *	NAT context.
+**/
+typedef struct tnet_nat_context_s
+{
+	TSK_DECLARE_OBJECT;
+
+	//tnet_fd_t localFD; /**< Local file descriptor. */
+	tnet_socket_type_t socket_type;
+
+	char* username; /**< The username to use to authenticate against the TURN/STUN server. */
+	char* password;	/**< The password to use to authenticate against the TURN/STUN server. */
+	char* software;	/**< The turn/stun client name. */
+
+	char* server_address; /**< TURN/STUN server address (could be FQDN or IP) */
+	tnet_port_t server_port; /**< TURN/STUN server port. */
+
+	uint16_t RTO; /**< Estimate of the round-trip time (RTT) in millisecond. */
+	uint16_t Rc; /**< Number of retransmissions for UDP in millisecond. */
+
+	unsigned enable_dontfrag:1;
+	unsigned enable_integrity:1;
+	unsigned enable_evenport:1;
+	unsigned enable_fingerprint:1; /**< Indicates whether to add the 'fingerprint' attribute in all outgoing stun/turn requests. */
+	unsigned use_dnsquery:1; /**< Indicates whether to use DNS SRV query to find the stun/turn ip address. */
+
+	tnet_turn_allocations_L_t *allocations; /**< List of all allocations associated to this context. */
+	tnet_stun_bindings_L_t *stun_bindings; /**< List of all STUN2 bindings associated to this context. */
+}
+tnet_nat_context_t;
+
+/**@ingroup tnet_nat_group
+ * Handle to the NAT context(@ref tnet_nat_context_t).
+**/
+typedef void tnet_nat_context_handle_t;
+
+TINYNET_API int tnet_nat_set_server_address(tnet_nat_context_handle_t* self, const char* server_address);
+TINYNET_API int tnet_nat_set_server(tnet_nat_context_handle_t* self, const char* server_address,  tnet_port_t server_port);
+
+TINYNET_API tnet_stun_binding_id_t tnet_nat_stun_bind(const tnet_nat_context_handle_t* self, const tnet_fd_t localFD);
+TINYNET_API int tnet_nat_stun_get_reflexive_address(const tnet_nat_context_handle_t* self, tnet_stun_binding_id_t id, char** ipaddress, tnet_port_t *port);
+TINYNET_API int tnet_nat_stun_unbind(const tnet_nat_context_handle_t* self, tnet_stun_binding_id_t id);
+
+TINYNET_API tnet_turn_allocation_id_t tnet_nat_turn_allocate(const tnet_nat_context_handle_t* self, const tnet_fd_t localFD);
+TINYNET_API int tnet_nat_turn_get_reflexive_address(const tnet_nat_context_handle_t* self, tnet_turn_allocation_id_t id, char** ipaddress, tnet_port_t *port);
+TINYNET_API int tnet_nat_turn_allocation_refresh(const tnet_nat_context_handle_t* self, tnet_turn_allocation_id_t id);
+TINYNET_API int tnet_nat_turn_unallocate(const tnet_nat_context_handle_t* self, tnet_turn_allocation_id_t id);
+TINYNET_API tnet_turn_channel_binding_id_t tnet_nat_turn_channel_bind(const tnet_nat_context_handle_t* self, tnet_turn_allocation_id_t id, struct sockaddr_storage *peer);
+TINYNET_API int tnet_nat_turn_channel_refresh(const tnet_nat_context_handle_t* self, tnet_turn_channel_binding_id_t id);
+TINYNET_API int tnet_nat_turn_channel_send(const tnet_nat_context_handle_t* self, tnet_turn_channel_binding_id_t id, const void* data, tsk_size_t size, int indication);
+#define tnet_nat_turn_channel_sendindication(context, channel_id, data, size)	tnet_nat_turn_channel_send(context, channel_id, data, size, 1)
+#define tnet_nat_turn_channel_senddata(context, channel_id, data, size)			tnet_nat_turn_channel_send(context, channel_id, data, size, 0)
+TINYNET_API int tnet_nat_turn_add_permission(const tnet_nat_context_handle_t* self, tnet_turn_allocation_id_t id, const char* ipaddress, uint32_t timeout);
+
+TINYNET_API tnet_nat_context_handle_t* tnet_nat_context_create(tnet_socket_type_t socket_type, const char* username, const char* password);
+
+TINYNET_GEXTERN const tsk_object_def_t *tnet_nat_context_def_t;
+
+TNET_END_DECLS
+
+#endif /* TNET_NAT_H */