diff --git a/core/api/current.txt b/core/api/current.txt
index 7f0ff7f9955e..407855b107cd 100644
--- a/core/api/current.txt
+++ b/core/api/current.txt
@@ -40266,6 +40266,7 @@ package android.telecom {
     field public static final int PROPERTY_NETWORK_IDENTIFIED_EMERGENCY_CALL = 2048; // 0x800
     field public static final int PROPERTY_RTT = 1024; // 0x400
     field public static final int PROPERTY_SELF_MANAGED = 256; // 0x100
+    field public static final int PROPERTY_TETHERED_CALL = 32768; // 0x8000
     field public static final int PROPERTY_VOIP_AUDIO_MODE = 4096; // 0x1000
     field public static final int PROPERTY_WIFI = 8; // 0x8
   }
@@ -40294,6 +40295,7 @@ package android.telecom {
     field @NonNull public static final android.os.Parcelable.Creator<android.telecom.CallAudioState> CREATOR;
     field public static final int ROUTE_BLUETOOTH = 2; // 0x2
     field public static final int ROUTE_EARPIECE = 1; // 0x1
+    field public static final int ROUTE_EXTERNAL = 16; // 0x10
     field public static final int ROUTE_SPEAKER = 8; // 0x8
     field public static final int ROUTE_WIRED_HEADSET = 4; // 0x4
     field public static final int ROUTE_WIRED_OR_EARPIECE = 5; // 0x5
@@ -40568,6 +40570,7 @@ package android.telecom {
     field public static final int PROPERTY_IS_RTT = 256; // 0x100
     field public static final int PROPERTY_NETWORK_IDENTIFIED_EMERGENCY_CALL = 1024; // 0x400
     field public static final int PROPERTY_SELF_MANAGED = 128; // 0x80
+    field public static final int PROPERTY_TETHERED_CALL = 16384; // 0x4000
     field public static final int PROPERTY_WIFI = 8; // 0x8
     field public static final int STATE_ACTIVE = 4; // 0x4
     field public static final int STATE_DIALING = 3; // 0x3
diff --git a/telecomm/java/android/telecom/Call.java b/telecomm/java/android/telecom/Call.java
index d94fafc6a5bf..ce9530c196ef 100644
--- a/telecomm/java/android/telecom/Call.java
+++ b/telecomm/java/android/telecom/Call.java
@@ -701,8 +701,15 @@ public final class Call {
          */
         public static final int PROPERTY_CROSS_SIM = 0x00004000;
 
+        /**
+         * Connection is a tethered external call.
+         * Indicates that the {@link Connection} is fixed on this device but the audio streams are
+         * re-routed to another device.
+         */
+        public static final int PROPERTY_TETHERED_CALL = 0x00008000;
+
         //******************************************************************************************
-        // Next PROPERTY value: 0x00004000
+        // Next PROPERTY value: 0x00010000
         //******************************************************************************************
 
         private final @CallState int mState;
@@ -899,6 +906,9 @@ public final class Call {
             if (hasProperty(properties, PROPERTY_CROSS_SIM)) {
                 builder.append(" PROPERTY_CROSS_SIM");
             }
+            if (hasProperty(properties, PROPERTY_TETHERED_CALL)) {
+                builder.append(" PROPERTY_TETHERED_CALL");
+            }
             builder.append("]");
             return builder.toString();
         }
diff --git a/telecomm/java/android/telecom/CallAudioState.java b/telecomm/java/android/telecom/CallAudioState.java
index fccdf76372dd..389df80497df 100644
--- a/telecomm/java/android/telecom/CallAudioState.java
+++ b/telecomm/java/android/telecom/CallAudioState.java
@@ -27,7 +27,6 @@ import android.os.Parcelable;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
@@ -42,7 +41,8 @@ import java.util.stream.Collectors;
 public final class CallAudioState implements Parcelable {
     /** @hide */
     @Retention(RetentionPolicy.SOURCE)
-    @IntDef(value={ROUTE_EARPIECE, ROUTE_BLUETOOTH, ROUTE_WIRED_HEADSET, ROUTE_SPEAKER},
+    @IntDef(value = {ROUTE_EARPIECE, ROUTE_BLUETOOTH, ROUTE_WIRED_HEADSET, ROUTE_SPEAKER,
+            ROUTE_EXTERNAL},
             flag=true)
     public @interface CallAudioRoute {}
 
@@ -58,6 +58,9 @@ public final class CallAudioState implements Parcelable {
     /** Direct the audio stream through the device's speakerphone. */
     public static final int ROUTE_SPEAKER       = 0x00000008;
 
+    /** Direct the audio stream through another device. */
+    public static final int ROUTE_EXTERNAL       = 0x00000010;
+
     /**
      * Direct the audio stream through the device's earpiece or wired headset if one is
      * connected.
@@ -70,7 +73,7 @@ public final class CallAudioState implements Parcelable {
      * @hide
      **/
     public static final int ROUTE_ALL = ROUTE_EARPIECE | ROUTE_BLUETOOTH | ROUTE_WIRED_HEADSET |
-            ROUTE_SPEAKER;
+            ROUTE_SPEAKER | ROUTE_EXTERNAL;
 
     private final boolean isMuted;
     private final int route;
@@ -189,7 +192,11 @@ public final class CallAudioState implements Parcelable {
      */
     @CallAudioRoute
     public int getSupportedRouteMask() {
-        return supportedRouteMask;
+        if (route == ROUTE_EXTERNAL) {
+            return ROUTE_EXTERNAL;
+        } else {
+            return supportedRouteMask;
+        }
     }
 
     /**
@@ -233,6 +240,10 @@ public final class CallAudioState implements Parcelable {
             listAppend(buffer, "SPEAKER");
         }
 
+        if ((route & ROUTE_EXTERNAL) == ROUTE_EXTERNAL) {
+            listAppend(buffer, "EXTERNAL");
+        }
+
         return buffer.toString();
     }
 
diff --git a/telecomm/java/android/telecom/Connection.java b/telecomm/java/android/telecom/Connection.java
index 21a180459978..30d495942ece 100644
--- a/telecomm/java/android/telecom/Connection.java
+++ b/telecomm/java/android/telecom/Connection.java
@@ -561,6 +561,15 @@ public abstract class Connection extends Conferenceable {
      */
     public static final int PROPERTY_CROSS_SIM = 1 << 13;
 
+    /**
+     * Connection is a tethered external call.
+     * <p>
+     * Indicates that the {@link Connection} is fixed on this device but the audio streams are
+     * re-routed to another device.
+     * <p>
+     */
+    public static final int PROPERTY_TETHERED_CALL = 1 << 14;
+
     //**********************************************************************************************
     // Next PROPERTY value: 1<<14
     //**********************************************************************************************