diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index b97be6ef47ae8..522c85c98a938 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -5132,4 +5132,13 @@
     <!-- Error message shown when there is a system error which can be solved by the manufacturer. [CHAR LIMIT=NONE] -->
     <string name="system_error_manufacturer">There\'s an internal problem with your device. Contact your manufacturer for details.</string>
 
+    <!-- Displayed when the USSD/SS request is modified by STK CC to a
+    different request. This will be displayed in a toast. -->
+    <string name="stk_cc_ussd_to_dial">USSD request is modified to DIAL request.</string>
+    <string name="stk_cc_ussd_to_ss">USSD request is modified to SS request.</string>
+    <string name="stk_cc_ussd_to_ussd">USSD request is modified to new USSD request.</string>
+    <string name="stk_cc_ss_to_dial">SS request is modified to DIAL request.</string>
+    <string name="stk_cc_ss_to_ussd">SS request is modified to USSD request.</string>
+    <string name="stk_cc_ss_to_ss">SS request is modified to new SS request.</string>
+
 </resources>
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 802bbfa174e05..b6cf81eefa8b3 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -918,6 +918,12 @@
   <java-symbol type="string" name="default_audio_route_name_dock_speakers" />
   <java-symbol type="string" name="default_media_route_name_hdmi" />
   <java-symbol type="string" name="default_audio_route_category_name" />
+  <java-symbol type="string" name="stk_cc_ss_to_dial" />
+  <java-symbol type="string" name="stk_cc_ss_to_ss" />
+  <java-symbol type="string" name="stk_cc_ss_to_ussd" />
+  <java-symbol type="string" name="stk_cc_ussd_to_dial" />
+  <java-symbol type="string" name="stk_cc_ussd_to_ss" />
+  <java-symbol type="string" name="stk_cc_ussd_to_ussd" />
   <java-symbol type="string" name="safe_media_volume_warning" />
   <java-symbol type="string" name="media_route_status_scanning" />
   <java-symbol type="string" name="media_route_status_connecting" />
diff --git a/telephony/java/android/telephony/DisconnectCause.java b/telephony/java/android/telephony/DisconnectCause.java
index 189197658d2dc..674777ec328f5 100644
--- a/telephony/java/android/telephony/DisconnectCause.java
+++ b/telephony/java/android/telephony/DisconnectCause.java
@@ -165,6 +165,22 @@ public class DisconnectCause {
      */
     public static final int IMS_MERGED_SUCCESSFULLY = 45;
 
+    /**
+     * Stk Call Control modified DIAL request to USSD request.
+     * {@hide}
+     */
+    public static final int DIAL_MODIFIED_TO_USSD          = 46;
+    /**
+     * Stk Call Control modified DIAL request to SS request.
+     * {@hide}
+     */
+    public static final int DIAL_MODIFIED_TO_SS            = 47;
+    /**
+     * Stk Call Control modified DIAL request to DIAL with modified data.
+     * {@hide}
+     */
+    public static final int DIAL_MODIFIED_TO_DIAL          = 48;
+
     //*********************************************************************************************
     // When adding a disconnect type:
     // 1) Please assign the new type the next id value below.
@@ -173,14 +189,14 @@ public class DisconnectCause {
     // 4) Update toString() with the newly added disconnect type.
     // 5) Update android.telecom.DisconnectCauseUtil with any mappings to a telecom.DisconnectCause.
     //
-    // NextId: 46
+    // NextId: 49
     //*********************************************************************************************
 
     /** Smallest valid value for call disconnect codes. */
     public static final int MINIMUM_VALID_VALUE = NOT_DISCONNECTED;
 
     /** Largest valid value for call disconnect codes. */
-    public static final int MAXIMUM_VALID_VALUE = IMS_MERGED_SUCCESSFULLY;
+    public static final int MAXIMUM_VALID_VALUE = DIAL_MODIFIED_TO_DIAL;
 
     /** Private constructor to avoid class instantiation. */
     private DisconnectCause() {
@@ -272,6 +288,12 @@ public class DisconnectCause {
             return "CDMA_CALL_LOST";
         case EXITED_ECM:
             return "EXITED_ECM";
+        case DIAL_MODIFIED_TO_USSD:
+            return "DIAL_MODIFIED_TO_USSD";
+        case DIAL_MODIFIED_TO_SS:
+            return "DIAL_MODIFIED_TO_SS";
+        case DIAL_MODIFIED_TO_DIAL:
+            return "DIAL_MODIFIED_TO_DIAL";
         case ERROR_UNSPECIFIED:
             return "ERROR_UNSPECIFIED";
         case OUTGOING_FAILURE:
diff --git a/telephony/java/com/android/internal/telephony/RILConstants.java b/telephony/java/com/android/internal/telephony/RILConstants.java
index b5e82e3997584..a6d6daa12975d 100644
--- a/telephony/java/com/android/internal/telephony/RILConstants.java
+++ b/telephony/java/com/android/internal/telephony/RILConstants.java
@@ -57,7 +57,17 @@ public interface RILConstants {
                                                  retries needed */
     int MISSING_RESOURCE = 16;                /* no logical channel available */
     int NO_SUCH_ELEMENT = 17;                 /* application not found on SIM */
+    int DIAL_MODIFIED_TO_USSD = 18;           /* DIAL request modified to USSD */
+    int DIAL_MODIFIED_TO_SS = 19;             /* DIAL request modified to SS */
+    int DIAL_MODIFIED_TO_DIAL = 20;           /* DIAL request modified to DIAL with different data*/
+    int USSD_MODIFIED_TO_DIAL = 21;           /* USSD request modified to DIAL */
+    int USSD_MODIFIED_TO_SS = 22;             /* USSD request modified to SS */
+    int USSD_MODIFIED_TO_USSD = 23;           /* USSD request modified to different USSD request */
+    int SS_MODIFIED_TO_DIAL = 24;             /* SS request modified to DIAL */
+    int SS_MODIFIED_TO_USSD = 25;             /* SS request modified to USSD */
     int SUBSCRIPTION_NOT_SUPPORTED = 26;      /* Subscription not supported */
+    int SS_MODIFIED_TO_SS = 27;               /* SS request modified to different SS request */
+
 
     /* NETWORK_MODE_* See ril.h RIL_REQUEST_SET_PREFERRED_NETWORK_TYPE */
     int NETWORK_MODE_WCDMA_PREF     = 0; /* GSM/WCDMA (WCDMA preferred) */
@@ -339,4 +349,6 @@ cat include/telephony/ril.h | \
     int RIL_UNSOL_HARDWARE_CONFIG_CHANGED = 1040;
     int RIL_UNSOL_DC_RT_INFO_CHANGED = 1041;
     int RIL_UNSOL_RADIO_CAPABILITY = 1042;
+    int RIL_UNSOL_ON_SS = 1043;
+    int RIL_UNSOL_STK_CC_ALPHA_NOTIFY = 1044;
 }