diff --git a/telecomm/java/android/telecom/PhoneAccount.java b/telecomm/java/android/telecom/PhoneAccount.java
index b5d9d3935c535..4390fae226e56 100644
--- a/telecomm/java/android/telecom/PhoneAccount.java
+++ b/telecomm/java/android/telecom/PhoneAccount.java
@@ -90,6 +90,18 @@ public final class PhoneAccount implements Parcelable {
     public static final String EXTRA_SUPPORTS_HANDOVER_TO =
             "android.telecom.extra.SUPPORTS_HANDOVER_TO";
 
+    /**
+     * Boolean {@link PhoneAccount} extras key (see {@link PhoneAccount#getExtras()}) which
+     * indicates whether this {@link PhoneAccount} supports using a fallback if video calling is
+     * not available. This extra is for device level support, {@link
+     * android.telephony.CarrierConfigManager#KEY_ALLOW_VIDEO_CALLING_FALLBACK_BOOL} should also
+     * be checked to ensure it is not disabled by individual carrier.
+     *
+     * @hide
+     */
+    public static final String EXTRA_SUPPORTS_VIDEO_CALLING_FALLBACK =
+            "android.telecom.extra.SUPPORTS_VIDEO_CALLING_FALLBACK";
+
     /**
      * Boolean {@link PhoneAccount} extras key (see {@link PhoneAccount#getExtras()}) which
      * indicates whether this {@link PhoneAccount} is capable of supporting a request to handover a
diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index f2d2253a8f38d..414780869a4df 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -1219,6 +1219,15 @@ public class CarrierConfigManager {
      */
     public static final String KEY_VIDEO_CALLS_CAN_BE_HD_AUDIO = "video_calls_can_be_hd_audio";
 
+    /**
+     * Whether system apps are allowed to use fallback if carrier video call is not available.
+     * Defaults to {@code true}.
+     *
+     * @hide
+     */
+    public static final String KEY_ALLOW_VIDEO_CALLING_FALLBACK_BOOL =
+            "allow_video_calling_fallback_bool";
+
     /**
      * Defines operator-specific {@link com.android.ims.ImsReasonInfo} mappings.
      *
@@ -1665,6 +1674,7 @@ public class CarrierConfigManager {
         sDefaults.putBoolean(KEY_ALLOW_ADD_CALL_DURING_VIDEO_CALL_BOOL, true);
         sDefaults.putBoolean(KEY_WIFI_CALLS_CAN_BE_HD_AUDIO, true);
         sDefaults.putBoolean(KEY_VIDEO_CALLS_CAN_BE_HD_AUDIO, true);
+        sDefaults.putBoolean(KEY_ALLOW_VIDEO_CALLING_FALLBACK_BOOL, true);
 
         sDefaults.putStringArray(KEY_IMS_REASONINFO_MAPPING_STRING_ARRAY, null);
         sDefaults.putBoolean(KEY_ENHANCED_4G_LTE_TITLE_VARIANT_BOOL, false);