diff --git a/mbtk/mbtk_lib/src/mbtk_audio_alsa.c b/mbtk/mbtk_lib/src/mbtk_audio_alsa.c
index 3e54453..45ce873 100755
--- a/mbtk/mbtk_lib/src/mbtk_audio_alsa.c
+++ b/mbtk/mbtk_lib/src/mbtk_audio_alsa.c
@@ -81,6 +81,8 @@
 
 static struct mopen_audio_t *internal_hdl = NULL;
 
+static int dsp_rx_gain = 0xFF;
+static int dsp_tx_gain = 0xFF;
 
 int mbtk_wav_pcm16Le_check(int fd)
 {
@@ -257,6 +259,14 @@
             printf("%s: error reading!\n", __FUNCTION__);
             break;
         }
+
+        if(dsp_tx_gain == 0xFF) {
+            if(!mbtk_dsp_gain_get(&dsp_rx_gain, &dsp_tx_gain)) {
+                vcm_config_dspgain(CONFIG_DSPGAIN_TX, dsp_tx_gain);
+                dsp_rx_gain = 0xFF;
+            }
+        }
+
         if ((bufsize > 0) && (NULL != _usrData->_cb))
         {
             _usrData->_cb(2, data, bufsize);
@@ -586,7 +596,7 @@
 //    {
 //        bufsize = len;
 //    }
-    
+
     while (pcxt->state != AUDIO_STOP)
     {
 
@@ -595,7 +605,7 @@
 
         if(read_size > len)
         {
-         //    printf(">[%d]\n", read_size); 
+         //    printf(">[%d]\n", read_size);
             break;
         }
 
@@ -621,12 +631,12 @@
 
         if(read_size == len)
         {
-         //    printf("=[%d]", read_size); 
+         //    printf("=[%d]", read_size);
             break;
         }
 
     }
-    
+
     if(pcxt->state != AUDIO_STOP)
     {
         mbtk_audio_set_status(dev_hdl, AUDIO_OPEN);
@@ -669,14 +679,14 @@
 
     mbtk_audio_set_status(dev_hdl, AUDIO_RUNNING);
     int all_size = 0;
-    
+
     while (pcxt->state != AUDIO_STOP)
     {
         res = read(file_fd, data, bufsize);
       //   printf("%s:read : %d bytes\n", __FUNCTION__, res);
         if(res == 0 || res < 0)
         {
-             printf("read:[%d]", res); 
+             printf("read:[%d]", res);
             break;
         }
 
@@ -709,6 +719,13 @@
             audio_play_cb(pcxt, AUD_PLAYER_LESSDATA);
             break;
         }
+
+        if(dsp_rx_gain == 0xFF) {
+            if(!mbtk_dsp_gain_get(&dsp_rx_gain, &dsp_tx_gain)) {
+                vcm_config_dspgain(CONFIG_DSPGAIN_RX, dsp_rx_gain);
+                dsp_tx_gain = 0xFF;
+            }
+        }
     }
     if (audio_play_cb)
         audio_play_cb(pcxt, AUD_PLAYER_FINISHED);
diff --git a/mbtk/mbtk_lib/src/mbtk_audio_gain.c b/mbtk/mbtk_lib/src/mbtk_audio_gain.c
new file mode 100755
index 0000000..f0a961b
--- /dev/null
+++ b/mbtk/mbtk_lib/src/mbtk_audio_gain.c
@@ -0,0 +1,156 @@
+/*
+*    mbtk_audio_gain.c
+*
+*    MBTK audio gain for nvm : /NVM/audio_gain.nvm.
+*
+*/
+/******************************************************************************
+
+                          EDIT HISTORY FOR FILE
+
+  WHEN        WHO       WHAT,WHERE,WHY
+--------    --------    -------------------------------------------------------
+2024/3/1     LiuBin      Initial version
+
+******************************************************************************/
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <cutils/properties.h>
+
+#include "mbtk_log.h"
+#include "mbtk_str.h"
+#include "mbtk_audio_gain.h"
+
+void vcm_config_dspgain(unsigned int type, unsigned int gain);
+
+int mbtk_dsp_gain_set(CONFIG_DSPGAIN_Direction dir, int gain)
+{
+    if((gain < MBTK_AUDIO_GAIN_MIN || gain > MBTK_AUDIO_GAIN_MAX)
+        && gain != CONFIG_DSPGAIN_MUTE_ON && gain != CONFIG_DSPGAIN_MUTE_OFF) {
+        LOGE("DSP gain range: %d - %d or %d or %d", MBTK_AUDIO_GAIN_MIN, MBTK_AUDIO_GAIN_MAX,
+            CONFIG_DSPGAIN_MUTE_ON, CONFIG_DSPGAIN_MUTE_OFF);
+        return -1;
+    }
+
+    int fd = open(MBTK_AUDIO_GAIN_PATH, O_RDWR);
+    if(fd < 0) {
+        LOGE("Open file(%s) fail:%d", MBTK_AUDIO_GAIN_PATH, errno);
+        return -1;
+    }
+
+    if( -1 == lseek(fd, MBTK_AUDIO_GAIN_ADD_START, SEEK_SET)) {
+        LOGE("lseek(%d) fail:%d", MBTK_AUDIO_GAIN_ADD_START, errno);
+        goto fail;
+    }
+
+    ACMCodec_GainT gains[VC_HEAD_NUM];
+    int len;
+    memset(gains, 0x0, sizeof(gains));
+    if((len = read(fd, gains, sizeof(gains))) != sizeof(gains)) {
+        LOGE("read(%d/%d) fail:%d", len, sizeof(gains), errno);
+        goto fail;
+    }
+
+    int i = 0;
+    while(i < VC_HEAD_NUM) {
+        if(dir == CONFIG_DSPGAIN_RX) {
+            gains[i].Rx_DSPGain[AUDIOHAL_SPK_VOL_QTY] = (int16)(gain & 0xFFFF);
+        } else if(dir == CONFIG_DSPGAIN_TX) {
+            gains[i].Tx_DSPGain = (int16)(gain & 0xFFFF);
+        }/* else if(dir == CONFIG_DSPGAIN_SIDETONE) {
+            gains[i].Rx_DSPSideToneGain = gain;
+        }*/ else {
+            LOGE("Unknown direction : %d", dir);
+            goto fail;
+        }
+        i++;
+    }
+
+    if( -1 == lseek(fd, MBTK_AUDIO_GAIN_ADD_START, SEEK_SET)) {
+        LOGE("lseek(%d) fail:%d", MBTK_AUDIO_GAIN_ADD_START, errno);
+        goto fail;
+    }
+
+    if(write(fd, gains, sizeof(gains)) != sizeof(gains)) {
+        LOGE("write(%d) fail:%d", sizeof(gains), errno);
+        goto fail;
+    }
+
+    if(fsync(fd)) {
+        LOGE("fsync(%d) fail:%d", fd, errno);
+        goto fail;
+    }
+
+    close(fd);
+
+    LOGD("DSP gain NVM update success.");
+
+    char buff[10];
+    memset(buff, 0, 10);
+    snprintf(buff, 10, "%d", gain);
+    if(dir == CONFIG_DSPGAIN_RX) {
+        if(property_set("persist.mbtk.dsp_rx_gain", buff) == 0) {
+            // Set gain to DSP.
+            vcm_config_dspgain(dir, gain);
+        }
+    } else if(dir == CONFIG_DSPGAIN_TX) {
+        if(property_set("persist.mbtk.dsp_tx_gain", buff) == 0) {
+            // Set gain to DSP.
+            vcm_config_dspgain(dir, gain);
+        }
+    }else {
+        LOGE("Unknown direction : %d", dir);
+        goto fail;
+    }
+
+    return 0;
+
+fail:
+    close(fd);
+    return -1;
+}
+
+int mbtk_dsp_gain_get(int *rx_gain, int *tx_gain)
+{
+    if(rx_gain == NULL || tx_gain == NULL) {
+        LOGE("gain is NULL.");
+        return -1;
+    }
+
+    int fd = open(MBTK_AUDIO_GAIN_PATH, O_RDONLY);
+    if(fd < 0) {
+        LOGE("Open file(%s) fail:%d", MBTK_AUDIO_GAIN_PATH, errno);
+        return -1;
+    }
+
+    if( -1 == lseek(fd, MBTK_AUDIO_GAIN_ADD_START, SEEK_SET)) {
+        LOGE("lseek(%d) fail:%d", MBTK_AUDIO_GAIN_ADD_START, errno);
+        goto fail;
+    }
+
+    ACMCodec_GainT gains[VC_HEAD_NUM];
+    int len;
+    memset(gains, 0x0, sizeof(gains));
+    if((len = read(fd, gains, sizeof(gains))) != sizeof(gains)) {
+        LOGE("read(%d/%d) fail:%d", len, sizeof(gains), errno);
+        goto fail;
+    }
+
+    close(fd);
+
+    *rx_gain = gains[VC_HANDSFREE].Rx_DSPGain[AUDIOHAL_SPK_VOL_QTY];
+    *tx_gain = gains[VC_HANDSFREE].Tx_DSPGain;
+    return 0;
+fail:
+    close(fd);
+    return -1;
+}
+
+
+
+