diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8aa6a8af57496bc1fa7953e45c51584bb8250b86..cc2153f897a6c72149e05eb1c6b6102b3fda71ce 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -32,6 +32,7 @@ variables:
   INSTR_DIR: "scripts/c-code_instrument"
   BUILD_WITH_DEBUG_MODE_INFO: ""
   ENCODER_TEST: ""
+  SKIP_REGRESSION_CHECK: ""
   MANUAL_PIPELINE_TYPE:
     description: "Type for the manual pipeline run. Use 'pytest-compare' to run comparison test against reference float codec."
     value: 'default'
diff --git a/lib_com/options.h b/lib_com/options.h
index 24f21262eff5924a8a7128128e3a2aeaec84b19f..cfc24032325db60dc4987fc44b2b450e90b9c376 100755
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -150,4 +150,5 @@
 #define FIX_ISSUE_1237                          /* VA: replacement of Copy_Scale_sig_16_32_DEPREC() that are doing 16 bits left shift by Copy_Scale_sig_16_32_no_sat() */
 #define FIX_ISSUE_1237_KEEP_EVS_BE              /* VA: Fix to keep EVS bitexactness to 26.444 */
 #define FIX_ISSUE_1214                          /* Ittiam: Fix for issue 1214: Energy leakage in IGF tiles for MDCT-stereo @64kbps SWB*/
+#define FIX_881_HILBERT_FILTER                  /* VA: improve the precision of the Hilbert filter to remove 2kHz unwanted tone */
 #endif
diff --git a/lib_com/swb_tbe_com.c b/lib_com/swb_tbe_com.c
index 9b20512a24e17ca91b7c39668a07e128894cf01f..bc5538aebbfff469a11ccf5a281a8115c9d87395 100644
--- a/lib_com/swb_tbe_com.c
+++ b/lib_com/swb_tbe_com.c
@@ -69,7 +69,44 @@ void GenSHBSynth_fx_32(
     Word32 speech_buf_32k[L_FRAME32k];
     Word16 i;
 
+#ifdef FIX_881_HILBERT_FILTER
+    Word16 shift = 0;
+    Word32 maxm32, input_synspeech_temp[L_FRAME16k];
+
+    /* find the maximum value and derive the shift to improve precision of the Hilbert filter */
+    maxm32 = L_deposit_l( 0 );
+    FOR( i = 0; i < L_FRAME16k; i++ )
+    {
+        maxm32 = L_max( maxm32, L_abs( input_synspeech[i] ) );
+    }
+
+    FOR( i = 0; i < 2 * ALLPASSSECTIONS_STEEP; i++ )
+    {
+        maxm32 = L_max( maxm32, L_abs( state_lsyn_filt_shb_local[i] ) );
+    }
+
+    FOR( i = 0; i < HILBERT_MEM_SIZE; i++ )
+    {
+        maxm32 = L_max( maxm32, L_abs( Hilbert_Mem[i] ) );
+    }
+
+    IF( maxm32 != 0 )
+    {
+        shift = sub( norm_l( maxm32 ), 3 );
+
+        Copy_Scale_sig32( input_synspeech, input_synspeech_temp, L_FRAME16k, shift );
+        Scale_sig32( state_lsyn_filt_shb_local, 2 * ALLPASSSECTIONS_STEEP, shift );
+        Scale_sig32( Hilbert_Mem, HILBERT_MEM_SIZE, shift );
+    }
+    else
+    {
+        Copy32( input_synspeech, input_synspeech_temp, L_FRAME16k );
+    }
+
+    Interpolate_allpass_steep_32( input_synspeech_temp, state_lsyn_filt_shb_local, L_FRAME16k, speech_buf_32k );
+#else
     Interpolate_allpass_steep_32( input_synspeech, state_lsyn_filt_shb_local, L_FRAME16k, speech_buf_32k );
+#endif
 
     IF( EQ_16( L_frame, L_FRAME ) )
     {
@@ -92,6 +129,15 @@ void GenSHBSynth_fx_32(
         }
     }
 
+#ifdef FIX_881_HILBERT_FILTER
+    IF( maxm32 != 0 )
+    {
+        Scale_sig32( shb_syn_speech_32k, L_FRAME32k, -shift );
+        Scale_sig32( state_lsyn_filt_shb_local, 2 * ALLPASSSECTIONS_STEEP, -shift );
+        Scale_sig32( Hilbert_Mem, HILBERT_MEM_SIZE, -shift );
+    }
+#endif
+
     return;
 }
 void ScaleShapedSHB_32(