diff --git a/src/network/network_turn.h b/src/network/network_turn.h
new file mode 100644
--- /dev/null
+++ b/src/network/network_turn.h
@@ -0,0 +1,41 @@
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD 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, version 2.
+ * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file network_turn.h Part of the network protocol handling TURN requests. */
+
+#ifndef NETWORK_TURN_H
+#define NETWORK_TURN_H
+
+#include "core/tcp_turn.h"
+
+/** Class for handling the client side of the TURN connection. */
+class ClientNetworkTurnSocketHandler : public NetworkTurnSocketHandler {
+private:
+	std::string token;             ///< Token of this connection.
+	uint8 tracking_number;         ///< Tracking number of this connection.
+	std::string connection_string; ///< The connection string of the TURN server we are connecting to.
+
+protected:
+	bool Receive_TURN_ERROR(Packet *p) override;
+	bool Receive_TURN_CONNECTED(Packet *p) override;
+
+public:
+	TCPConnecter *connecter = nullptr; ///< Connecter instance.
+	bool connect_started = false;      ///< Whether we started the connection.
+
+	ClientNetworkTurnSocketHandler(const std::string &token, uint8 tracking_number, const std::string &connection_string) : token(token), tracking_number(tracking_number), connection_string(connection_string) {}
+
+	NetworkRecvStatus CloseConnection(bool error = true) override;
+	void SendReceive();
+
+	void Connect();
+	void ConnectFailure();
+
+	static std::unique_ptr<ClientNetworkTurnSocketHandler> Turn(const std::string &token, uint8 tracking_number, const std::string &ticket, const std::string &connection_string);
+};
+
+#endif /* NETWORK_TURN_H */