diff --git a/api/current.txt b/api/current.txt
index 334ccebe1bc4c..634b4893b9f2e 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -44257,6 +44257,7 @@ package android.telephony {
     field public static final String KEY_DEFAULT_VM_NUMBER_STRING = "default_vm_number_string";
     field public static final String KEY_DIAL_STRING_REPLACE_STRING_ARRAY = "dial_string_replace_string_array";
     field public static final String KEY_DISABLE_CDMA_ACTIVATION_CODE_BOOL = "disable_cdma_activation_code_bool";
+    field public static final String KEY_DISCONNECT_CAUSE_PLAY_BUSYTONE_INT_ARRAY = "disconnect_cause_play_busytone_int_array";
     field public static final String KEY_DISPLAY_HD_AUDIO_PROPERTY_BOOL = "display_hd_audio_property_bool";
     field public static final String KEY_DROP_VIDEO_CALL_WHEN_ANSWERING_AUDIO_CALL_BOOL = "drop_video_call_when_answering_audio_call_bool";
     field public static final String KEY_DTMF_TYPE_ENABLED_BOOL = "dtmf_type_enabled_bool";
diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 9b4b0829924a8..9e60afc7a1246 100755
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -3199,6 +3199,13 @@ public class CarrierConfigManager {
     public static final String KEY_CARRIER_CERTIFICATE_STRING_ARRAY =
             "carrier_certificate_string_array";
 
+    /**
+     * DisconnectCause array to play busy tone. Value should be array of
+     * {@link android.telephony.DisconnectCause}.
+     */
+    public static final String KEY_DISCONNECT_CAUSE_PLAY_BUSYTONE_INT_ARRAY =
+            "disconnect_cause_play_busytone_int_array";
+
     /** The default value for every variable. */
     private final static PersistableBundle sDefaults;
 
@@ -3628,6 +3635,8 @@ public class CarrierConfigManager {
         sDefaults.putBoolean(KEY_SUPPORT_WPS_OVER_IMS_BOOL, true);
         sDefaults.putAll(Ims.getDefaults());
         sDefaults.putStringArray(KEY_CARRIER_CERTIFICATE_STRING_ARRAY, null);
+        sDefaults.putIntArray(KEY_DISCONNECT_CAUSE_PLAY_BUSYTONE_INT_ARRAY,
+                new int[] {4 /* BUSY */});
     }
 
     /**