diff --git a/src/com/android/services/telephony/DisconnectCauseUtil.java b/src/com/android/services/telephony/DisconnectCauseUtil.java
index 8af6849..8f38ee1 100644
--- a/src/com/android/services/telephony/DisconnectCauseUtil.java
+++ b/src/com/android/services/telephony/DisconnectCauseUtil.java
@@ -124,6 +124,7 @@
             case android.telephony.DisconnectCause.DIALED_MMI:
             case android.telephony.DisconnectCause.EXITED_ECM:
             case android.telephony.DisconnectCause.MMI:
+            case android.telephony.DisconnectCause.IMS_MERGED_SUCCESSFULLY:
                 return DisconnectCause.OTHER;
 
             case android.telephony.DisconnectCause.NOT_VALID:
@@ -334,6 +335,8 @@
             case android.telephony.DisconnectCause.NORMAL:
                 return ToneGenerator.TONE_PROP_PROMPT;
 
+            case android.telephony.DisconnectCause.IMS_MERGED_SUCCESSFULLY:
+                // Do not play any tones if disconnected because of a successful merge.
             default:
                 return ToneGenerator.TONE_UNKNOWN;
         }