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diff --git a/include/asterisk/channelstate.h b/include/asterisk/channelstate.h
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+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2010, Digium, Inc.
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ * \brief Channel states
+ * \par See also:
+ *  \arg \ref Def_Channel
+ *  \arg \ref channel_drivers
+ */
+
+#ifndef __AST_CHANNELSTATE_H__
+#define __AST_CHANNELSTATE_H__
+
+#include "asterisk.h"
+
+/*!
+ * \brief ast_channel states
+ *
+ * \note Bits 0-15 of state are reserved for the state (up/down) of the line
+ *       Bits 16-32 of state are reserved for flags
+ */
+enum ast_channel_state {
+	AST_STATE_DOWN,			/*!< Channel is down and available */
+	AST_STATE_RESERVED,		/*!< Channel is down, but reserved */
+	AST_STATE_OFFHOOK,		/*!< Channel is off hook */
+	AST_STATE_DIALING,		/*!< Digits (or equivalent) have been dialed */
+	AST_STATE_RING,			/*!< Line is ringing */
+	AST_STATE_RINGING,		/*!< Remote end is ringing */
+	AST_STATE_UP,			/*!< Line is up */
+	AST_STATE_BUSY,			/*!< Line is busy */
+	AST_STATE_DIALING_OFFHOOK,	/*!< Digits (or equivalent) have been dialed while offhook */
+	AST_STATE_PRERING,		/*!< Channel has detected an incoming call and is waiting for ring */
+
+	AST_STATE_MUTE = (1 << 16),	/*!< Do not transmit voice data */
+};
+
+/*! \brief Change the state of a channel */
+int ast_setstate(struct ast_channel *chan, enum ast_channel_state);
+
+#endif /* __AST_CHANNELSTATE_H__ */