diff --git a/telephony/java/com/android/ims/internal/IImsCallSession.aidl b/telephony/java/com/android/ims/internal/IImsCallSession.aidl
index 2cf720892ad2c..16b0cd5e1c95c 100644
--- a/telephony/java/com/android/ims/internal/IImsCallSession.aidl
+++ b/telephony/java/com/android/ims/internal/IImsCallSession.aidl
@@ -160,10 +160,13 @@ interface IImsCallSession {
     void resume(in ImsStreamMediaProfile profile);
 
     /**
-     * Merges the active & hold call. When it succeeds, {@link Listener#callSessionMerged}
-     * is called.
+     * Merges the active & hold call. When the merge starts,
+     * {@link Listener#callSessionMergeStarted} is called.
+     * {@link Listener#callSessionMergeComplete} is called if the merge is successful, and
+     * {@link Listener#callSessionMergeFailed} is called if the merge fails.
      *
-     * @see Listener#callSessionMerged, Listener#callSessionMergeFailed
+     * @see Listener#callSessionMergeStarted, Listener#callSessionMergeComplete,
+     *      Listener#callSessionMergeFailed
      */
     void merge();
 
diff --git a/telephony/java/com/android/ims/internal/IImsCallSessionListener.aidl b/telephony/java/com/android/ims/internal/IImsCallSessionListener.aidl
index 11da6e6aa547b..84d1c54575f8e 100644
--- a/telephony/java/com/android/ims/internal/IImsCallSessionListener.aidl
+++ b/telephony/java/com/android/ims/internal/IImsCallSessionListener.aidl
@@ -48,10 +48,11 @@ interface IImsCallSessionListener {
     void callSessionResumeReceived(in IImsCallSession session, in ImsCallProfile profile);
 
     /**
-     * Notifiies the result of call merge operation.
+     * Notifies the result of call merge operation.
      */
-    void callSessionMerged(in IImsCallSession session,
+    void callSessionMergeStarted(in IImsCallSession session,
             in IImsCallSession newSession, in ImsCallProfile profile);
+    void callSessionMergeComplete(in IImsCallSession session);
     void callSessionMergeFailed(in IImsCallSession session,
             in ImsReasonInfo reasonInfo);