diff --git a/api/current.txt b/api/current.txt
index 08f5d00..ff44ba2 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -36684,6 +36684,7 @@
     field public static final java.lang.String PARENTAL_CONTROL_ENABLED = "parental_control_enabled";
     field public static final java.lang.String PARENTAL_CONTROL_LAST_UPDATE = "parental_control_last_update";
     field public static final java.lang.String PARENTAL_CONTROL_REDIRECT_URL = "parental_control_redirect_url";
+    field public static final java.lang.String RTT_CALLING_MODE = "rtt_calling_mode";
     field public static final java.lang.String SELECTED_INPUT_METHOD_SUBTYPE = "selected_input_method_subtype";
     field public static final java.lang.String SETTINGS_CLASSNAME = "settings_classname";
     field public static final java.lang.String SKIP_FIRST_USE_HINTS = "skip_first_use_hints";
@@ -36789,7 +36790,6 @@
     field public static final deprecated java.lang.String RADIO_NFC = "nfc";
     field public static final deprecated java.lang.String RADIO_WIFI = "wifi";
     field public static final java.lang.String RINGTONE = "ringtone";
-    field public static final java.lang.String RTT_CALLING_MODE = "rtt_calling_mode";
     field public static final java.lang.String SCREEN_BRIGHTNESS = "screen_brightness";
     field public static final java.lang.String SCREEN_BRIGHTNESS_MODE = "screen_brightness_mode";
     field public static final int SCREEN_BRIGHTNESS_MODE_AUTOMATIC = 1; // 0x1
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 98d8666..a99ae2e 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -3753,17 +3753,6 @@
                 new SettingsValidators.InclusiveIntegerRangeValidator(0, 3);
 
         /**
-         * User-selected RTT mode. When on, outgoing and incoming calls will be answered as RTT
-         * calls when supported by the device and carrier. Boolean value.
-         * 0 = OFF
-         * 1 = ON
-         */
-        public static final String RTT_CALLING_MODE = "rtt_calling_mode";
-
-        /** @hide */
-        public static final Validator RTT_CALLING_MODE_VALIDATOR = BOOLEAN_VALIDATOR;
-
-        /**
          * Whether the sounds effects (key clicks, lid open ...) are enabled. The value is
          * boolean (1 or 0).
          */
@@ -4088,7 +4077,6 @@
             DTMF_TONE_WHEN_DIALING,
             DTMF_TONE_TYPE_WHEN_DIALING,
             HEARING_AID,
-            RTT_CALLING_MODE,
             TTY_MODE,
             MASTER_MONO,
             SOUND_EFFECTS_ENABLED,
@@ -4287,7 +4275,6 @@
             VALIDATORS.put(DTMF_TONE_TYPE_WHEN_DIALING, DTMF_TONE_TYPE_WHEN_DIALING_VALIDATOR);
             VALIDATORS.put(HEARING_AID, HEARING_AID_VALIDATOR);
             VALIDATORS.put(TTY_MODE, TTY_MODE_VALIDATOR);
-            VALIDATORS.put(RTT_CALLING_MODE, RTT_CALLING_MODE_VALIDATOR);
             VALIDATORS.put(NOTIFICATION_LIGHT_PULSE, NOTIFICATION_LIGHT_PULSE_VALIDATOR);
             VALIDATORS.put(POINTER_LOCATION, POINTER_LOCATION_VALIDATOR);
             VALIDATORS.put(SHOW_TOUCHES, SHOW_TOUCHES_VALIDATOR);
@@ -6660,6 +6647,17 @@
         private static final Validator TTY_MODE_ENABLED_VALIDATOR = BOOLEAN_VALIDATOR;
 
         /**
+         * User-selected RTT mode. When on, outgoing and incoming calls will be answered as RTT
+         * calls when supported by the device and carrier. Boolean value.
+         * 0 = OFF
+         * 1 = ON
+         */
+        public static final String RTT_CALLING_MODE = "rtt_calling_mode";
+
+        private static final Validator RTT_CALLING_MODE_VALIDATOR = BOOLEAN_VALIDATOR;
+
+        /**
+        /**
          * Controls whether settings backup is enabled.
          * Type: int ( 0 = disabled, 1 = enabled )
          * @hide
@@ -7885,6 +7883,7 @@
             PREFERRED_TTY_MODE,
             ENHANCED_VOICE_PRIVACY_ENABLED,
             TTY_MODE_ENABLED,
+            RTT_CALLING_MODE,
             INCALL_POWER_BUTTON_BEHAVIOR,
             NIGHT_DISPLAY_CUSTOM_START_TIME,
             NIGHT_DISPLAY_CUSTOM_END_TIME,
@@ -8014,6 +8013,7 @@
             VALIDATORS.put(ENHANCED_VOICE_PRIVACY_ENABLED,
                     ENHANCED_VOICE_PRIVACY_ENABLED_VALIDATOR);
             VALIDATORS.put(TTY_MODE_ENABLED, TTY_MODE_ENABLED_VALIDATOR);
+            VALIDATORS.put(RTT_CALLING_MODE, RTT_CALLING_MODE_VALIDATOR);
             VALIDATORS.put(INCALL_POWER_BUTTON_BEHAVIOR, INCALL_POWER_BUTTON_BEHAVIOR_VALIDATOR);
             VALIDATORS.put(NIGHT_DISPLAY_CUSTOM_START_TIME,
                     NIGHT_DISPLAY_CUSTOM_START_TIME_VALIDATOR);
diff --git a/core/proto/android/providers/settings/secure.proto b/core/proto/android/providers/settings/secure.proto
index 593747d..3de8c39 100644
--- a/core/proto/android/providers/settings/secure.proto
+++ b/core/proto/android/providers/settings/secure.proto
@@ -340,6 +340,11 @@
     }
     optional Rotation rotation = 46;
 
+    // User-selected RTT mode. When on, outgoing and incoming calls will be
+    // answered as RTT calls when supported by the device and carrier. Boolean
+    // value.
+    optional SettingProto rtt_calling_mode = 69 [ (android.privacy).dest = DEST_AUTOMATIC ];
+
     message Screensaver {
         option (android.msg_privacy).dest = DEST_EXPLICIT;
 
@@ -474,5 +479,5 @@
 
     // Please insert fields in alphabetical order and group them into messages
     // if possible (to avoid reaching the method limit).
-    // Next tag = 69;
+    // Next tag = 70;
 }
diff --git a/core/proto/android/providers/settings/system.proto b/core/proto/android/providers/settings/system.proto
index 6b6edd2..dfc4081 100644
--- a/core/proto/android/providers/settings/system.proto
+++ b/core/proto/android/providers/settings/system.proto
@@ -151,10 +151,7 @@
     }
     optional Rotation rotation = 20;
 
-    // User-selected RTT mode. When on, outgoing and incoming calls will be
-    // answered as RTT calls when supported by the device and carrier. Boolean
-    // value.
-    optional SettingProto rtt_calling_mode = 21 [ (android.privacy).dest = DEST_AUTOMATIC ];
+    reserved 21; // rtt_calling_mode moved to Settings.Secure
 
     message Screen {
         option (android.msg_privacy).dest = DEST_EXPLICIT;
diff --git a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
index f43e719..19ee151 100644
--- a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
+++ b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
@@ -2019,6 +2019,10 @@
                 SecureSettingsProto.Rotation.NUM_ROTATION_SUGGESTIONS_ACCEPTED);
         p.end(rotationToken);
 
+        dumpSetting(s, p,
+                Settings.Secure.RTT_CALLING_MODE,
+                SecureSettingsProto.RTT_CALLING_MODE);
+
         final long screensaverToken = p.start(SecureSettingsProto.SCREENSAVER);
         dumpSetting(s, p,
                 Settings.Secure.SCREENSAVER_ENABLED,
@@ -2402,10 +2406,6 @@
                 SystemSettingsProto.Rotation.HIDE_ROTATION_LOCK_TOGGLE_FOR_ACCESSIBILITY);
         p.end(rotationToken);
 
-        dumpSetting(s, p,
-                Settings.System.RTT_CALLING_MODE,
-                SystemSettingsProto.RTT_CALLING_MODE);
-
         final long screenToken = p.start(SystemSettingsProto.SCREEN);
         dumpSetting(s, p,
                 Settings.System.SCREEN_OFF_TIMEOUT,