diff --git a/src/engine/config.h b/src/engine/config.h
index a27ab521..420a69b2 100644
--- a/src/engine/config.h
+++ b/src/engine/config.h
@@ -66,33 +66,33 @@
 
 // AMR codec defines - it requires USE_AMR_CODEC defined
 // #define USE_AMR_CODEC
-#define MT_AMRNB_PAYLOADTYPE 97
+#define MT_AMRNB_PAYLOADTYPE -1
 #define MT_AMRNB_CODECNAME "amr"
 
-#define MT_AMRNB_OCTET_PAYLOADTYPE 103
+#define MT_AMRNB_OCTET_PAYLOADTYPE -1
 
-#define MT_AMRWB_PAYLOADTYPE 96
+#define MT_AMRWB_PAYLOADTYPE -1
 #define MT_AMRWB_CODECNAME "amr-wb"
 
-#define MT_AMRWB_OCTET_PAYLOADTYPE 104
+#define MT_AMRWB_OCTET_PAYLOADTYPE -1
 
-#define MT_GSMEFR_PAYLOADTYPE 110
+#define MT_GSMEFR_PAYLOADTYPE -1
 #define MT_GSMEFR_CODECNAME "GERAN-EFR"
 
 // OPUS codec defines
 // #define USE_OPUS_CODEC
-#define MT_OPUS_CODEC_PT 106
+#define MT_OPUS_CODEC_PT -1
 
 // ILBC codec defines
-#define MT_ILBC20_PAYLOADTYPE 98
-#define MT_ILBC30_PAYLOADTYPE 99
+#define MT_ILBC20_PAYLOADTYPE -1
+#define MT_ILBC30_PAYLOADTYPE -1
 
 // ISAC codec defines
-#define MT_ISAC16K_PAYLOADTYPE 100
-#define MT_ISAC32K_PAYLOADTYPE 101
+#define MT_ISAC16K_PAYLOADTYPE -1
+#define MT_ISAC32K_PAYLOADTYPE -1
 
 // GSM HR payload type
-#define MT_GSMHR_PAYLOADTYPE 111
+#define MT_GSMHR_PAYLOADTYPE -1
 
 // Mirror buffer capacity
 #define MT_MIRROR_CAPACITY 32768