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diff --git a/include/call.h b/include/call.h
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+/*
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the License);
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#ifndef __TIZEN_TELEPHONY_CALL_H__
+#define __TIZEN_TELEPHONY_CALL_H__
+
+/**
+ * @file call.h
+ * @brief This file contains call APIs and related enumeration.
+ */
+
+#include <tizen.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @addtogroup CAPI_TELEPHONY_CALL_MODULE
+ * @{
+ */
+ 
+/**
+ * @brief Enumeration for call error.
+ */
+typedef enum
+{
+	CALL_ERROR_NONE = TIZEN_ERROR_NONE, /**< Successful */
+	CALL_ERROR_OUT_OF_MEMORY = TIZEN_ERROR_OUT_OF_MEMORY, /**< Out of memory */
+	CALL_ERROR_INVALID_PARAMETER = TIZEN_ERROR_INVALID_PARAMETER, /**< Invalid parameter */	
+	CALL_ERROR_OPERATION_FAILED = TIZEN_ERROR_TELEPHONY_CLASS | 0x1000, /**< Operation failed */	
+} call_error_e;
+
+/**
+ * @brief Enumeration of the call state.
+ */
+typedef enum
+{
+    CALL_STATE_IDLE, /**< No activity. */
+    CALL_STATE_CONNECTING, /**< Ringing, dialing or new call is coming when another call is already active. */
+    CALL_STATE_ACTIVE, /**< A call is active. */
+} call_state_e;
+
+/**
+ * @brief Called when call state changes.
+ * @param [in] call_state The call state
+ * @param [in] user_data The user data passed from the callback registration function
+ * @pre This callback function is invoked if you register this function using either call_set_voice_call_state_changed_cb() or call_set_video_call_state_changed_cb().
+ * @see call_set_voice_call_state_changed_cb()
+ * @see call_unset_voice_call_state_changed_cb() 
+ * @see call_set_video_call_state_changed_cb()
+ * @see call_unset_video_call_state_changed_cb() 
+ */
+typedef void(* call_state_changed_cb)(call_state_e call_state, void *user_data);
+
+
+/**
+ * @brief Gets the state of voice call.
+ * @details Determines if the voice call is connecting, active, or idle. 
+ *
+ * @remarks When you are dialing a number or a new voice call is ringing, the state of the voice call is #CALL_STATE_CONNECTING. 
+ * When a new voice call is connecting while another voice call is already active, 
+ * the state of the voice call is #CALL_STATE_CONNECTING as well.
+ *
+ * @param[out] call_state The current state of the voice call 
+ * @return 0 on success, otherwise a negative error value.
+ * @retval #CALL_ERROR_NONE Successful
+ * @retval #CALL_ERROR_OPERATION_FAILED Operation failed
+ * @retval #CALL_ERROR_INVALID_PARAMETER Invalid parameter
+ */
+int call_get_voice_call_state(call_state_e *call_state);
+
+/**
+ * @brief Gets the state of video call.
+ * @details Determines if the video call is connecting, active, or idle.  
+ * @remarks When you are dialing a number or a new video call is ringing, the state of the video call is #CALL_STATE_CONNECTING. 
+ * If a video call is active, then the state of any other call cannot be #CALL_STATE_CONNECTING and #CALL_STATE_ACTIVE.
+ *
+ * @param[out] call_state The current state of the video call
+ * @return 0 on success, otherwise a negative error value.
+ * @retval #CALL_ERROR_NONE Successful
+ * @retval #CALL_ERROR_OPERATION_FAILED Operation failed
+ * @retval #CALL_ERROR_INVALID_PARAMETER Invalid parameter
+ */
+int call_get_video_call_state(call_state_e *call_state);
+
+/**
+ * @brief Registers a callback function to be invoked when the voice call state changes.
+ *
+ * @param [in] callback The callback function to register
+ * @param [in] user_data The user data to be passed to the callback function
+ * @return 0 on success, otherwise a negative error value.
+ * @retval #CALL_ERROR_NONE Successful
+ * @retval #CALL_ERROR_INVALID_PARAMETER Invalid parameter
+ * @retval #CALL_ERROR_OPERATION_FAILED Operation failed
+ * @post call_state_changed_cb() will be invoked. 
+ * @see  call_state_changed_cb()
+ * @see  call_unset_voice_call_state_changed_cb()
+ *
+ */
+int call_set_voice_call_state_changed_cb(call_state_changed_cb callback, void *user_data);
+
+/**
+ * @brief Unregisters the callback function.
+ * 
+ * @return 0 on success, otherwise a negative error value.
+ * @retval #CALL_ERROR_NONE Successful
+ * @retval #CALL_ERROR_OPERATION_FAILED Operation failed
+ * @see	call_set_voice_call_state_changed_cb()
+ *
+ */
+int call_unset_voice_call_state_changed_cb();
+
+/**
+ * @brief Registers a callback function to be invoked when the video call state changes.
+ *
+ * @param [in] callback The callback function to register
+ * @param [in] user_data The user data to be passed to the callback function
+ * @return 0 on success, otherwise a negative error value.
+ * @retval #CALL_ERROR_NONE Successful
+ * @retval #CALL_ERROR_INVALID_PARAMETER Invalid parameter
+ * @retval #CALL_ERROR_OPERATION_FAILED Operation failed
+ * @post call_state_changed_cb() will be invoked. 
+ * @see call_state_changed_cb()
+ * @see call_unset_video_call_state_changed_cb()
+ *
+ */
+int call_set_video_call_state_changed_cb(call_state_changed_cb callback, void *user_data);
+
+/**
+ * @brief Unregisters the callback function.
+ * 
+ * @return 0 on success, otherwise a negative error value.
+ * @retval #CALL_ERROR_NONE Successful
+ * @retval #CALL_ERROR_OPERATION_FAILED Operation failed 
+ * @see	call_set_video_call_state_changed_cb()
+ *
+ */
+int call_unset_video_call_state_changed_cb();
+
+					
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif // __TIZEN_TELEPHONY_CALL_H__
+
+/**
+ * @}
+ */