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diff --git a/src/common_audio/vad/main/interface/webrtc_vad.h b/src/common_audio/vad/main/interface/webrtc_vad.h
new file mode 100644
index 0000000000..6e3eb74ab5
--- /dev/null
+++ b/src/common_audio/vad/main/interface/webrtc_vad.h
@@ -0,0 +1,159 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This header file includes the VAD API calls. Specific function calls are given below.
+ */
+
+#ifndef WEBRTC_VAD_WEBRTC_VAD_H_
+#define WEBRTC_VAD_WEBRTC_VAD_H_
+
+#include "typedefs.h"
+
+typedef struct WebRtcVadInst VadInst;
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/****************************************************************************
+ * WebRtcVad_get_version(...)
+ *
+ * This function returns the version number of the code.
+ *
+ * Output:
+ *      - version       : Pointer to a buffer where the version info will
+ *                        be stored.
+ * Input:
+ *      - size_bytes    : Size of the buffer.
+ *
+ */
+WebRtc_Word16 WebRtcVad_get_version(char *version, size_t size_bytes);
+
+/****************************************************************************
+ * WebRtcVad_AssignSize(...) 
+ *
+ * This functions get the size needed for storing the instance for encoder
+ * and decoder, respectively
+ *
+ * Input/Output:
+ *      - size_in_bytes : Pointer to integer where the size is returned
+ *
+ * Return value         : 0
+ */
+WebRtc_Word16 WebRtcVad_AssignSize(int *size_in_bytes);
+
+/****************************************************************************
+ * WebRtcVad_Assign(...) 
+ *
+ * This functions Assigns memory for the instances.
+ *
+ * Input:
+ *        - vad_inst_addr :  Address to where to assign memory
+ * Output:
+ *        - vad_inst      :  Pointer to the instance that should be created
+ *
+ * Return value           :  0 - Ok
+ *                          -1 - Error
+ */
+WebRtc_Word16 WebRtcVad_Assign(VadInst **vad_inst, void *vad_inst_addr);
+
+/****************************************************************************
+ * WebRtcVad_Create(...)
+ *
+ * This function creates an instance to the VAD structure
+ *
+ * Input:
+ *      - vad_inst      : Pointer to VAD instance that should be created
+ *
+ * Output:
+ *      - vad_inst      : Pointer to created VAD instance
+ *
+ * Return value         :  0 - Ok
+ *                        -1 - Error
+ */
+WebRtc_Word16 WebRtcVad_Create(VadInst **vad_inst);
+
+/****************************************************************************
+ * WebRtcVad_Free(...)
+ *
+ * This function frees the dynamic memory of a specified VAD instance
+ *
+ * Input:
+ *      - vad_inst      : Pointer to VAD instance that should be freed
+ *
+ * Return value         :  0 - Ok
+ *                        -1 - Error
+ */
+WebRtc_Word16 WebRtcVad_Free(VadInst *vad_inst);
+
+/****************************************************************************
+ * WebRtcVad_Init(...)
+ *
+ * This function initializes a VAD instance
+ *
+ * Input:
+ *      - vad_inst      : Instance that should be initialized
+ *
+ * Output:
+ *      - vad_inst      : Initialized instance
+ *
+ * Return value         :  0 - Ok
+ *                        -1 - Error
+ */
+WebRtc_Word16 WebRtcVad_Init(VadInst *vad_inst);
+
+/****************************************************************************
+ * WebRtcVad_set_mode(...)
+ *
+ * This function initializes a VAD instance
+ *
+ * Input:
+ *      - vad_inst      : VAD instance
+ *      - mode          : Aggressiveness setting (0, 1, 2, or 3) 
+ *
+ * Output:
+ *      - vad_inst      : Initialized instance
+ *
+ * Return value         :  0 - Ok
+ *                        -1 - Error
+ */
+WebRtc_Word16 WebRtcVad_set_mode(VadInst *vad_inst, WebRtc_Word16 mode);
+
+/****************************************************************************
+ * WebRtcVad_Process(...)
+ * 
+ * This functions does a VAD for the inserted speech frame
+ *
+ * Input
+ *        - vad_inst     : VAD Instance. Needs to be initiated before call.
+ *        - fs           : sampling frequency (Hz): 8000, 16000, or 32000
+ *        - speech_frame : Pointer to speech frame buffer
+ *        - frame_length : Length of speech frame buffer in number of samples
+ *
+ * Output:
+ *        - vad_inst     : Updated VAD instance
+ *
+ * Return value          :  1 - Active Voice
+ *                          0 - Non-active Voice
+ *                         -1 - Error
+ */
+WebRtc_Word16 WebRtcVad_Process(VadInst *vad_inst,
+                                WebRtc_Word16 fs,
+                                WebRtc_Word16 *speech_frame,
+                                WebRtc_Word16 frame_length);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // WEBRTC_VAD_WEBRTC_VAD_H_