diff --git a/src/com/android/services/telephony/DisconnectCauseUtil.java b/src/com/android/services/telephony/DisconnectCauseUtil.java
index 361e5dc..dd0f416 100644
--- a/src/com/android/services/telephony/DisconnectCauseUtil.java
+++ b/src/com/android/services/telephony/DisconnectCauseUtil.java
@@ -726,6 +726,7 @@
             case android.telephony.DisconnectCause.ERROR_UNSPECIFIED:
             case android.telephony.DisconnectCause.LOCAL:
             case android.telephony.DisconnectCause.NORMAL:
+            case android.telephony.DisconnectCause.NORMAL_UNSPECIFIED:
             case android.telephony.DisconnectCause.VIDEO_CALL_NOT_ALLOWED_WHILE_TTY_ENABLED:
                 return ToneGenerator.TONE_PROP_PROMPT;