diff --git a/telephony/java/com/android/ims/internal/IImsService.aidl b/telephony/java/com/android/ims/internal/IImsService.aidl
index a9614a63d872a..406d22d9bd8eb 100644
--- a/telephony/java/com/android/ims/internal/IImsService.aidl
+++ b/telephony/java/com/android/ims/internal/IImsService.aidl
@@ -38,8 +38,19 @@ interface IImsService {
     void close(int serviceId);
     boolean isConnected(int serviceId, int serviceType, int callType);
     boolean isOpened(int serviceId);
+
+    /**
+     * Replace existing registration listener
+     *
+     */
     void setRegistrationListener(int serviceId, in IImsRegistrationListener listener);
 
+    /**
+     * Add new registration listener
+     */
+    void addRegistrationListener(int phoneId, int serviceClass,
+            in IImsRegistrationListener listener);
+
     ImsCallProfile createCallProfile(int serviceId, int serviceType, int callType);
 
     IImsCallSession createCallSession(int serviceId, in ImsCallProfile profile,