diff --git a/reflector/M17Protocol.cpp b/reflector/M17Protocol.cpp
index 5406bc1..83718f4 100644
--- a/reflector/M17Protocol.cpp
+++ b/reflector/M17Protocol.cpp
@@ -626,6 +626,19 @@ bool CM17Protocol::IsValidDvPacket(const CBuffer &Buffer, std::unique_ptr<CDvHea
 		// get the frame
 		frame = std::unique_ptr<CDvFramePacket>(new CDvFramePacket(m17));
 
+        // DEBUG: Check FrameType
+        printf("M17_DEBUG: IsValidDvPacket Type=%04X Buf19=%02X CodecIn=%d\n", 
+            m17.GetFrameType(), Buffer[19], (int)frame->GetCodecInV());
+            // Need accessor for codec_in. CDvFramePacket has GetCodecIn() but it calls m_TCPack.
+            // Oh, CDvFramePacket doesn't expose it directly except via cast? 
+            // CPacket has GetCodecIn() ? CPacket does NOT have GetCodecIn().
+            // STCPacket has codec_in.
+            // CDvFramePacket has SetCodecData.
+            // Let's use GetCodecData if possible? No.
+            // Let's just print FrameType. It's enough.
+            
+        printf("M17_DEBUG: IsValidDvPacket Type=%04X Buf19=%02X\n", m17.GetFrameType(), Buffer[19]);
+
 		// check validity of packets
 		if ( header && header->IsValid() && frame && frame->IsValid() )
 			return true;