diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index d2ee71a6ddb5d..a6a7c841c5ec7 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -980,6 +980,12 @@ public class CarrierConfigManager {
     public static final String KEY_CARRIER_VOLTE_TTY_SUPPORTED_BOOL
             = "carrier_volte_tty_supported_bool";
 
+    /** Flag specifying whether VoWIFI TTY is supported.
+     * @hide
+     */
+    public static final String KEY_CARRIER_VOWIFI_TTY_SUPPORTED_BOOL =
+            "carrier_vowifi_tty_supported_bool";
+
     /**
      * Flag specifying whether IMS service can be turned off. If false then the service will not be
      * turned-off completely, but individual features can be disabled.
@@ -8581,6 +8587,7 @@ public class CarrierConfigManager {
         sDefaults.putBoolean(KEY_CARRIER_SUPPORTS_SS_OVER_UT_BOOL, false);
         sDefaults.putBoolean(KEY_CARRIER_VOLTE_OVERRIDE_WFC_PROVISIONING_BOOL, false);
         sDefaults.putBoolean(KEY_CARRIER_VOLTE_TTY_SUPPORTED_BOOL, true);
+        sDefaults.putBoolean(KEY_CARRIER_VOWIFI_TTY_SUPPORTED_BOOL, true);
         sDefaults.putBoolean(KEY_CARRIER_ALLOW_TURNOFF_IMS_BOOL, true);
         sDefaults.putBoolean(KEY_CARRIER_IMS_GBA_REQUIRED_BOOL, false);
         sDefaults.putBoolean(KEY_CARRIER_INSTANT_LETTERING_AVAILABLE_BOOL, false);