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diff --git a/src/parser/definitions.h b/src/parser/definitions.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
+*/
+
+#ifndef _DEFINITIONS_H
+#define _DEFINITIONS_H
+
+#include <string>
+#include "protocol.h"
+#include "sockets/url.h"
+
+using namespace std;
+
+#define SIP_VERSION	"2.0"
+
+// RFC 3261
+#ifndef RFC3261_COOKIE
+#define RFC3261_COOKIE	"z9hG4bK"
+#endif
+
+// Authentication schemes
+#define AUTH_DIGEST	"Digest"
+
+// Authentication algorithms
+#define ALG_MD5		"MD5"
+#define ALG_AKAV1_MD5	"AKAV1-MD5"
+#define ALG_MD5_SESS	"MD5-sess"
+
+// Authentication QOP
+#define QOP_AUTH	"auth"
+#define QOP_AUTH_INT	"auth-int"
+
+/** SIP request methods. */
+enum t_method {
+	INVITE,
+	ACK,
+	OPTIONS,
+	BYE,
+	CANCEL,
+	REGISTER,
+	PRACK,
+	SUBSCRIBE,
+	NOTIFY,
+	REFER,
+	INFO,
+	MESSAGE,
+	PUBLISH,
+	METHOD_UNKNOWN
+};
+
+/**
+ * Convert a method to a string.
+ * @param m The method.
+ * @param unknown Method name if m is @ref METHOD_UNKNOWN.
+ * @return The name of the method.
+ */
+string method2str(const t_method &m, const string &unknown = "");
+
+/**
+ * Convert a string to a method.
+ * @param s The string.
+ * @return The method having s as name. If s is an unknown name,
+ * then @ref METHOD_UNKNOWN is returned.
+ */
+t_method str2method(const string &s);
+
+#endif