diff --git a/src/com/android/phone/vvm/omtp/sms/OmtpCvvmMessageSender.java b/src/com/android/phone/vvm/omtp/sms/OmtpCvvmMessageSender.java
index 7f45254..98d8594 100644
--- a/src/com/android/phone/vvm/omtp/sms/OmtpCvvmMessageSender.java
+++ b/src/com/android/phone/vvm/omtp/sms/OmtpCvvmMessageSender.java
@@ -48,7 +48,7 @@
     private void sendCvvmMessage(String request, PendingIntent sentIntent) {
         StringBuilder sb = new StringBuilder().append(request);
         sb.append(OmtpConstants.SMS_PREFIX_SEPARATOR);
-        appendField(sb, "dt", "15");
+        appendField(sb, "dt" /* device type */, "6" /* no VTT (transcription) support*/);
         sendSms(sb.toString(), sentIntent);
     }
 }