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diff --git a/pjmedia/include/pjmedia-codec/g722.h b/pjmedia/include/pjmedia-codec/g722.h
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+/* $Id: g722.h 3553 2011-05-05 06:14:19Z nanang $ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * 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 __PJMEDIA_CODEC_G722_H__
+#define __PJMEDIA_CODEC_G722_H__
+
+/**
+ * @file pjmedia-codec/g722.h
+ * @brief G.722 codec.
+ */
+
+#include <pjmedia-codec/types.h>
+
+/**
+ * @defgroup PJMED_G722 G.722 Codec
+ * @ingroup PJMEDIA_CODEC_CODECS
+ * @brief Implementation of G.722 Codec
+ * @{
+ *
+ * This section describes functions to initialize and register G.722 codec
+ * factory to the codec manager. After the codec factory has been registered,
+ * application can use @ref PJMEDIA_CODEC API to manipulate the codec.
+ *
+ * The G.722 implementation uses 16-bit PCM with sampling rate 16000Hz and 
+ * 20ms frame length resulting in 64kbps bitrate.
+ *
+ * The G.722 codec implementation is provided as part of pjmedia-codec
+ * library, and does not depend on external G.722 codec implementation.
+ *
+ * \section codec_setting Codec Settings
+ *
+ * \subsection general_setting General Settings
+ *
+ * General codec settings for this codec such as VAD and PLC can be 
+ * manipulated through the <tt>setting</tt> field in #pjmedia_codec_param. 
+ * Please see the documentation of #pjmedia_codec_param for more info.
+ *
+ * \subsection specific_setting Codec Specific Settings
+ *
+ * Currently none.
+ */
+
+PJ_BEGIN_DECL
+
+
+/**
+ * Initialize and register G.722 codec factory to pjmedia endpoint.
+ *
+ * @param endpt	    The pjmedia endpoint.
+ *
+ * @return	    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_codec_g722_init(pjmedia_endpt *endpt);
+
+
+/**
+ * Unregister G.722 codec factory from pjmedia endpoint and cleanup
+ * resources allocated by the factory.
+ *
+ * @return	    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_codec_g722_deinit(void);
+
+
+/**
+ * Set the G.722 codec encoder and decoder level adjustment.
+ * If the value is non-zero, then PCM input samples to the encoder will 
+ * be shifted right by this value, and similarly PCM output samples from
+ * the decoder will be shifted left by this value.
+ *
+ * Default value is PJMEDIA_G722_DEFAULT_PCM_SHIFT.
+ *
+ * @param val		The value
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_codec_g722_set_pcm_shift(unsigned val);
+
+
+PJ_END_DECL
+
+
+/**
+ * @}
+ */
+
+#endif /* __PJMEDIA_CODEC_G722_H__ */
+