diff --git a/lib_com/cnst.h b/lib_com/cnst.h
index 26903f525c1b76bb76389ec68d07b0cb6ba155b4..87aafb11a441ff053804dbc9e363e308fa1e9ad8 100644
--- a/lib_com/cnst.h
+++ b/lib_com/cnst.h
@@ -932,6 +932,10 @@ typedef enum
 #define GAIN_PRED_ORDER                     4                       /* Gain quantization - prediction order for gain quantizer (only for AMR-WB IO mode) */
 #define MEAN_ENER                           30                      /* Gain quantization - average innovation energy */
 
+#ifdef NONBE_FIX_1277_EVS_DTX_HIGH_RATE_THRESHOLD
+#define DTX_THR                             5                       /* DTX - lp_noise threshold for DTX at higher bitrates */
+#endif
+
 #define DTX_HIST_SIZE                       8                       /* CNG & DTX - number of last signal frames used for CNG averaging */
 #define CNG_ISF_FACT                        0.9f                    /* CNG & DTX - CNG spectral envelope smoothing factor */
 #define STEP_AMR_WB_SID                     2.625f                  /* CNG & DTX - CNG energy quantization step */
diff --git a/lib_com/options.h b/lib_com/options.h
index 50c5066fa135885487b0352c7c36e5554f67b849..9fed7783e495ca5ca72a3c495fe8aff4f294ba79 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -170,4 +170,5 @@
 #define FIX_1298                                /* VA: fix possible assert in gaus_enc */
 #define FIX_1300_ICA_SHIFT_QUANT_IMPROV         /* VA: Fix to 1300 to improve precision of the lag quantizer */
 #define FIX_1301_CORRECT_TD_CNST                /* VA: Fix 1301, correct wrong constant in TD stereo */
+#define NONBE_FIX_1277_EVS_DTX_HIGH_RATE_THRESHOLD      /* VA/Eri: FLP issue 1277: Fix Mismatch in DTX high-rate threshold between EVS float and BASOP */
 #endif
diff --git a/lib_enc/dtx_fx.c b/lib_enc/dtx_fx.c
index 17965e99eae9fa29ee8c2ad4db0cdc3347dc25f4..a1478d3f80eb6772f6934c5a9fd753b7866db1de 100644
--- a/lib_enc/dtx_fx.c
+++ b/lib_enc/dtx_fx.c
@@ -30,9 +30,9 @@
 
 #define CNG_TYPE_HO 20 /* hangover for switching between CNG types */
 
-/* _DIFF_FLOAT_FIX_ : lp_noise_fx threshold is different between float (15) and fix (5*256) */
-#define LP_NOISE_LV 5 /* LP_NOISE level */
-
+#ifndef NONBE_FIX_1277_EVS_DTX_HIGH_RATE_THRESHOLD
+#define DTX_THR 5 /* LP_NOISE level */
+#endif
 
 #define MAX_BRATE_DTX_EVS  ACELP_24k40 /* maximum bitrate to which the default DTX is applied in EVS; otherwise DTX is applied only in silence */
 #define MAX_BRATE_DTX_IVAS IVAS_64k    /* maximum bitrate to which the default DTX is applied in IVAS; otherwise DTX is applied only in silence */
@@ -104,11 +104,10 @@ void dtx_ivas_fx(
     }
     ELSE
     {
-        /* _DIFF_FLOAT_FIX_ : lp_noise_fx threshold is different between float (15) and fix (5*256) */
         test();
         test();
         test();
-        last_br_cng_flag = LE_32( st_fx->last_total_brate_cng, ACELP_24k40 ) || LT_16( st_fx->lp_noise_fx, LP_NOISE_LV * 256 ) || ( EQ_16( st_fx->element_mode, IVAS_SCE ) && LE_32( st_fx->last_total_brate_cng, ACELP_32k ) );
+        last_br_cng_flag = LE_32( st_fx->last_total_brate_cng, ACELP_24k40 ) || LT_16( st_fx->lp_noise_fx, DTX_THR * 256 ) || ( EQ_16( st_fx->element_mode, IVAS_SCE ) && LE_32( st_fx->last_total_brate_cng, ACELP_32k ) );
 
         test();
         test();
@@ -117,9 +116,9 @@ void dtx_ivas_fx(
 #ifdef NONBE_1211_DTX_BR_SWITCHING
         last_br_flag = ( st_fx->element_mode == EVS_MONO && LE_32( st_fx->last_total_brate, MAX_BRATE_DTX_EVS ) ) ||
                        ( st_fx->element_mode != EVS_MONO && LE_32( last_ivas_total_brate, MAX_BRATE_DTX_IVAS ) ) ||
-                       LT_16( st_fx->lp_noise_fx, LP_NOISE_LV * 256 );
+                       LT_16( st_fx->lp_noise_fx, DTX_THR * 256 );
 #else
-        last_br_flag = LE_32( st_fx->last_total_brate, ACELP_24k40 ) || LT_16( st_fx->lp_noise_fx, LP_NOISE_LV * 256 ) || ( EQ_16( st_fx->element_mode, IVAS_SCE ) && LE_32( st_fx->last_total_brate, ACELP_32k ) );
+        last_br_flag = LE_32( st_fx->last_total_brate, ACELP_24k40 ) || LT_16( st_fx->lp_noise_fx, DTX_THR * 256 ) || ( EQ_16( st_fx->element_mode, IVAS_SCE ) && LE_32( st_fx->last_total_brate, ACELP_32k ) );
         br_dtx_flag = 0;
         move16();
 #endif
@@ -232,7 +231,11 @@ void dtx_ivas_fx(
         test();
         br_dtx_flag = ( ( st_fx->element_mode == EVS_MONO ) && LE_32( st_fx->total_brate, MAX_BRATE_DTX_EVS ) ) ||
                       ( ( st_fx->element_mode != EVS_MONO ) && LE_32( ivas_total_brate, MAX_BRATE_DTX_IVAS ) ) ||
+#ifdef NONBE_FIX_1277_EVS_DTX_HIGH_RATE_THRESHOLD
+                      LT_16( st_fx->lp_noise_fx, DTX_THR * 256 );
+#else
                       LT_16( st_fx->lp_noise_fx, 3840 /*15 in Q8*/ );
+#endif
     }
     test();
     test();
@@ -674,10 +677,9 @@ void dtx_fx(
     }
     ELSE
     {
-        /* _DIFF_FLOAT_FIX_ : lp_noise_fx threshold is different between float (15) and fix (5*256) */
-        last_br_cng_flag = LE_32( st_fx->last_total_brate_cng, ACELP_24k40 ) || LT_16( st_fx->lp_noise_fx, LP_NOISE_LV * 256 ) || ( EQ_16( st_fx->element_mode, IVAS_SCE ) && LE_32( st_fx->last_total_brate_cng, ACELP_32k ) );
+        last_br_cng_flag = LE_32( st_fx->last_total_brate_cng, ACELP_24k40 ) || LT_16( st_fx->lp_noise_fx, DTX_THR * 256 ) || ( EQ_16( st_fx->element_mode, IVAS_SCE ) && LE_32( st_fx->last_total_brate_cng, ACELP_32k ) );
 
-        last_br_flag = LE_32( st_fx->last_total_brate, ACELP_24k40 ) || LT_16( st_fx->lp_noise_fx, LP_NOISE_LV * 256 ) || ( EQ_16( st_fx->element_mode, IVAS_SCE ) && LE_32( st_fx->last_total_brate, ACELP_32k ) );
+        last_br_flag = LE_32( st_fx->last_total_brate, ACELP_24k40 ) || LT_16( st_fx->lp_noise_fx, DTX_THR * 256 ) || ( EQ_16( st_fx->element_mode, IVAS_SCE ) && LE_32( st_fx->last_total_brate, ACELP_32k ) );
         br_dtx_flag = 0;
         move16();
     }
@@ -772,8 +774,8 @@ void dtx_fx(
     if ( st_fx->dtx_sce_sba == 0 )
 #endif
     {
-        br_dtx_flag = LE_32( st_fx->total_brate, ACELP_24k40 ) || LT_16( st_fx->lp_noise_fx, LP_NOISE_LV * 256 ) || ( EQ_16( st_fx->element_mode, IVAS_SCE ) && LE_32( st_fx->total_brate, ACELP_32k ) ) ||
-                      EQ_16( st_fx->element_mode, IVAS_CPE_DFT ) || ( EQ_16( st_fx->element_mode, IVAS_CPE_MDCT ) && ( LE_32( st_fx->element_brate, IVAS_64k ) || LT_16( st_fx->lp_noise_fx, LP_NOISE_LV * 256 ) ) );
+        br_dtx_flag = LE_32( st_fx->total_brate, ACELP_24k40 ) || LT_16( st_fx->lp_noise_fx, DTX_THR * 256 ) || ( EQ_16( st_fx->element_mode, IVAS_SCE ) && LE_32( st_fx->total_brate, ACELP_32k ) ) ||
+                      EQ_16( st_fx->element_mode, IVAS_CPE_DFT ) || ( EQ_16( st_fx->element_mode, IVAS_CPE_MDCT ) && ( LE_32( st_fx->element_brate, IVAS_64k ) || LT_16( st_fx->lp_noise_fx, DTX_THR * 256 ) ) );
     }
     test();
     test();
diff --git a/lib_enc/ivas_ism_dtx_enc.c b/lib_enc/ivas_ism_dtx_enc.c
index 95b37435cfa319a860e409d7541f96a1a658afcf..3439baff1f412272a2d2968a5fbe0ffde6c6a961 100644
--- a/lib_enc/ivas_ism_dtx_enc.c
+++ b/lib_enc/ivas_ism_dtx_enc.c
@@ -177,7 +177,11 @@ Word16 ivas_ism_dtx_enc_fx(
             ( EQ_16( nchan_ism, 2 ) && LE_32( ivas_total_brate, IVAS_48k ) ) ||
             ( EQ_16( nchan_ism, 3 ) && LE_32( ivas_total_brate, IVAS_80k ) ) ||
             ( EQ_16( nchan_ism, 4 ) && LE_32( ivas_total_brate, IVAS_96k ) ) ||
+#ifdef NONBE_FIX_1277_EVS_DTX_HIGH_RATE_THRESHOLD
+            LT_16( lp_noise_max_fx, ( DTX_THR << 8 ) ) ) )
+#else
             LT_16( lp_noise_max_fx, ( 15 << 8 ) ) ) )
+#endif
     {
         dtx_flag = 0;
         move16();