diff --git a/telecomm/java/android/telecom/Call.java b/telecomm/java/android/telecom/Call.java
index a71161adda373..f9349639456d2 100644
--- a/telecomm/java/android/telecom/Call.java
+++ b/telecomm/java/android/telecom/Call.java
@@ -80,6 +80,13 @@ public final class Call {
      */
     public static final int STATE_CONNECTING = 9;
 
+    /**
+     * The state of a {@code Call} when the user has initiated a disconnection of the call, but the
+     * call has not yet been disconnected by the underlying {@code ConnectionService}.  The next
+     * state of the call is (potentially) {@link #STATE_DISCONNECTED}.
+     */
+    public static final int STATE_DISCONNECTING = 10;
+
     /**
      * The key to retrieve the optional {@code PhoneAccount}s Telecom can bundle with its Call
      * extras. Used to pass the phone accounts to display on the front end to the user in order to
@@ -828,6 +835,8 @@ public final class Call {
                 return STATE_DISCONNECTED;
             case CallState.ABORTED:
                 return STATE_DISCONNECTED;
+            case CallState.DISCONNECTING:
+                return STATE_DISCONNECTING;
             default:
                 Log.wtf(this, "Unrecognized CallState %s", parcelableCallState);
                 return STATE_NEW;
diff --git a/telecomm/java/android/telecom/CallState.java b/telecomm/java/android/telecom/CallState.java
index 769084794a2d1..bd9223affbff1 100644
--- a/telecomm/java/android/telecom/CallState.java
+++ b/telecomm/java/android/telecom/CallState.java
@@ -100,6 +100,16 @@ public final class CallState {
      */
     public static final int ABORTED = 8;
 
+    /**
+     * Indicates that the call is in the process of being disconnected and will transition next
+     * to a {@link #DISCONNECTED} state.
+     * <p>
+     * This state is not expected to be communicated from the Telephony layer, but will be reported
+     * to the InCall UI for calls where disconnection has been initiated by the user but the
+     * ConnectionService has confirmed the call as disconnected.
+     */
+    public static final int DISCONNECTING = 9;
+
     public static String toString(int callState) {
         switch (callState) {
             case NEW:
@@ -120,6 +130,8 @@ public final class CallState {
                 return "DISCONNECTED";
             case ABORTED:
                 return "ABORTED";
+            case DISCONNECTING:
+                return "DISCONNECTING";
             default:
                 return "UNKNOWN";
         }