diff --git a/lib_com/options.h b/lib_com/options.h
index 931b965c33e87dcab62ce8cfea78d1e911138490..86adc4edcf481d1226beacbcaeaa5104e07e4ed3 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -96,6 +96,7 @@
 #define OPTIMIZE_FFT_STACK                              /* VA: removal of intermediate FFT buffers */
 #define HARMONIZE_DCT                                   /* VA: removal of duplicated DCT functions */
 #define FIX_2489_HARMONIZE_FdCng_encodeSID              /* FhG: harmonize FdCng_encodeSID_fx() and FdCng_encodeSID_ivas_fx()  */
+#define FIX_1527_CMR_BITRATE_IDX                        /* Fix for incorrect bitrate idx packed in rtp CMR E-byte */
 
 /* #################### End BE switches ################################## */
 
diff --git a/lib_util/ivas_rtp_payload.c b/lib_util/ivas_rtp_payload.c
index 77b1c641afbbba296a39f7ccafd756e8ff7cb3a1..f290d7c41130c1d17b090674e7d79ea5dd7bb580 100644
--- a/lib_util/ivas_rtp_payload.c
+++ b/lib_util/ivas_rtp_payload.c
@@ -657,7 +657,11 @@ static uint32_t getBitrateIdx( const uint32_t *table, uint32_t tableLen, uint32_
 
     for ( n = 0; n < tableLen; n++ )
     {
+#ifdef FIX_1527_CMR_BITRATE_IDX
+        if ( bitrate >= ( table[n] * IVAS_NUM_FRAMES_PER_SEC ) )
+#else
         if ( bitrate > ( table[n] * IVAS_NUM_FRAMES_PER_SEC ) )
+#endif
         {
             idx = n;
         }
@@ -723,7 +727,11 @@ static void packEBytes(
             /* EVS Modes */
             bitrate = ( bitrate > 128000 ) ? 128000 : bitrate;
             bitrate = ( bitrate < 5900 ) ? 5900 : bitrate;
+#ifdef FIX_1527_CMR_BITRATE_IDX
+            bitrateIdx = getBitrateIdx( evsFrameSizeInBits, ( sizeof( evsFrameSizeInBits ) / sizeof( evsFrameSizeInBits[0] ) ) - 1, bitrate );
+#else
             bitrateIdx = getBitrateIdx( evsFrameSizeInBits, sizeof( evsFrameSizeInBits ) / sizeof( evsFrameSizeInBits[0] ), bitrate );
+#endif
             BR = (uint8_t) bitrateIdx & MASK_4BIT;
 
             /* If a bandwidth choice cannot be signalled for a given bitrate
@@ -787,7 +795,11 @@ static void packEBytes(
             /* Initial E-Byte */
             bitrate = ( bitrate > 512000 ) ? 512000 : bitrate;
             bitrate = ( bitrate < 13200 ) ? 13200 : bitrate;
+#ifdef FIX_1527_CMR_BITRATE_IDX
+            bitrateIdx = getBitrateIdx( ivasFrameSizeInBits, ( sizeof( ivasFrameSizeInBits ) / sizeof( ivasFrameSizeInBits[0] ) ) - 2, bitrate );
+#else
             bitrateIdx = getBitrateIdx( ivasFrameSizeInBits, sizeof( ivasFrameSizeInBits ) / sizeof( ivasFrameSizeInBits[0] ), bitrate );
+#endif
             BR = (uint8_t) bitrateIdx & MASK_4BIT;
             if ( nByte < maxNumEBytes )
             {