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diff --git a/src/sub_refer.h b/src/sub_refer.h
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+++ b/src/sub_refer.h
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+/*
+    Copyright (C) 2005-2009  Michel de Boer <michel@twinklephone.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
+*/
+
+// RFC 3515
+// Refer event package
+
+#ifndef _SUB_REFER_H
+#define _SUB_REFER_H
+
+#include "subscription.h"
+#include "dialog.h"
+
+// State of reference as seen by the referrer
+enum t_sub_refer_result {
+	SRR_INPROG,	// Referee is referring call
+	SRR_FAILED,	// Refer failed
+	SRR_SUCCEEDED,	// Refer succeeded
+};
+
+class t_sub_refer : public t_subscription {
+private:
+	// Result of the reference as seen by the referrer.
+	t_sub_refer_result	sr_result;
+
+	// Last response received from the refer-target
+	t_response		*last_response;
+
+	// Current substate of the notification
+	string			current_substate;
+	
+	t_dialog *get_dialog(void) const;
+
+public:
+	t_sub_refer(t_dialog *_dialog, t_subscription_role _role);
+	t_sub_refer(t_dialog *_dialog, t_subscription_role _role,
+		const string &_event_id);
+	virtual ~t_sub_refer();
+
+	// Send a NOTIFY with the status line of the response as body
+	// substate indicates the subscription state of refer
+	// A reason should be given if substate == TERMINATED
+	void send_notify(t_response *r, const string &substate,
+		const string reason = "");
+
+	bool recv_notify(t_request *r, t_tuid tuid, t_tid tid);
+	bool recv_subscribe(t_request *r, t_tuid tuid, t_tid tid);
+
+	bool timeout(t_subscribe_timer timer);
+
+	t_sub_refer_result get_sr_result(void) const;
+};
+
+#endif