Update RTP_EncDec.cc and RTP_Types.ttcn

src/RTP_EncDec.cc

@@ -39,9 +39,11 @@ RTP__messages__union f__RTP__dec(OCTETSTRING const &data){
 
   // A valid RTP packet must have at least 12  header header bytes. Shorter
   // packets cannot be valid, so we return an an RTP__messages__union that
-  // does not have any decoding results in it. See rfc3550 5.1.
-  if (data_length < 12)
-	  return ret_val;
+  // just reflects the raw packet as unknown_pdu. See rfc3550 5.1.
+  if (data_length < 12) {
+    ret_val.unknown__pdu()=OCTETSTRING(data_length,raw_data);
+    return ret_val;
+  }
 
   pt=raw_data[1]&0x7f;
   if(raw_data[0]&0x20){

src/RTP_Types.ttcn

@@ -447,7 +447,8 @@ type record ASP_RTP_Close_session{
 
 type union RTP_messages_union{
   PDU_RTCP              rtcp,
-  PDU_RTP               rtp
+  PDU_RTP               rtp,
+  octetstring           unknown_pdu
 }
 
 type record ASP_RTP_message{