diff --git a/lib_com/options.h b/lib_com/options.h
index 795fde1d6982ecfcc8e8cfc8c7d7b94b38626cf8..ab8aa2878472cfe151f149571efebbe8f7129695 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -206,6 +206,7 @@
 #define FIX_1387_INIT_PRM_SQQ                           /* FhG: initialize pointer prm_sqQ, which might be uninitialized in case of bfi == 1 */
 #define NONBE_1296_TDREND_ITD_OUT_OF_BOUNDS_ACCESS      /* Eri: issue 1296: ITD resampling can occasionally read out of bounds, especially when the requested subframes are short (1.25 ms). Seen for headtracking+JBM. */
 #define FIX_1349_TNS_CRASH                              /* FhG: Fix crash in TNS entropy coding, in case order of joint TNS coding is reduced to 0 */
+#define NONBE_FIX_1180_HQMDCT_PHECU_LT_MUTING           /* Ericsson: issue 1180, corrected long term mute loop attnuation after 200ms  in PhECU-PLC  */ 
 
 // object-editing feature porting
 #define OBJ_EDITING_API                                 /* object editing changes related to the API */
diff --git a/lib_dec/FEC_HQ_phase_ecu.c b/lib_dec/FEC_HQ_phase_ecu.c
index 363447e2f0a16657b29f2c6a50017d2420a09476..061f392047bcce647b750cd8e1201e9e3086a676 100644
--- a/lib_dec/FEC_HQ_phase_ecu.c
+++ b/lib_dec/FEC_HQ_phase_ecu.c
@@ -263,10 +263,13 @@ static void trans_ana(
     const int16_t time_offs,     /* i  : Time offset                                          */
     const float est_mus_content, /* i  : 0.0=speech_like ... 1.0=Music    (==st->env_stab )   */
     const int16_t last_fec,      /* i  : signal that previous frame was concealed with fec_alg*/
-    float *alpha,                /* o  : Magnitude modification factors for fade to average   */
-    float *beta,                 /* o  : Magnitude modification factors for fade to average   */
-    float *beta_mute,            /* o  : Factor for long-term mute                            */
-    float Xavg[LGW_MAX]          /* o  : Frequency group average gain to fade to              */
+#ifdef NONBE_FIX_1180_HQMDCT_PHECU_LT_MUTING
+    const int16_t element_mode, /* i :  element_mode req to handle EVS_MONO specific BE path  */
+#endif
+    float *alpha,       /* o  : Magnitude modification factors for fade to average   */
+    float *beta,        /* o  : Magnitude modification factors for fade to average   */
+    float *beta_mute,   /* o  : Factor for long-term mute                            */
+    float Xavg[LGW_MAX] /* o  : Frequency group average gain to fade to              */
 )
 {
     const float *w_hamm;
@@ -416,10 +419,28 @@ static void trans_ana(
             {
                 mag_chg[k] = 0;
             }
+
+#ifdef NONBE_FIX_1180_HQMDCT_PHECU_LT_MUTING
+            if ( element_mode != EVS_MONO )
+            {
+                if ( k == 0 && burst_len > BETA_MUTE_THR ) /* beta_mute final long term attenuation adjusted only once per frame in the first sub-band, Ref   Eq(184) in 26.447 */
+                {
+                    *beta_mute *= BETA_MUTE_FAC;
+                }
+            }
+            else
+            {
+                if ( burst_len > BETA_MUTE_THR ) /* legacy incorrect(too fast) EVS_MONO operation, still kept for BE.  To be updated after EVS CR, ref Eq (184) in 26.447 */
+                {
+                    *beta_mute *= BETA_MUTE_FAC;
+                }
+            }
+#else
             if ( burst_len > BETA_MUTE_THR )
             {
                 *beta_mute *= BETA_MUTE_FAC;
             }
+#endif
             alpha[k] = mag_chg[k];
             beta[k] = (float) ( sqrt( 1.0f - SQR( alpha[k] ) ) * *beta_mute );
             if ( k >= LGW32k - 1 )
@@ -2104,8 +2125,11 @@ static void hq_phase_ecu(
             *time_offs = 0;
         }
 #endif
-
+#ifdef NONBE_FIX_1180_HQMDCT_PHECU_LT_MUTING
+        trans_ana( prevsynth + 2 * output_frame - Lprot - *time_offs + ph_ecu_lookahead, mag_chg, &ph_dith, mag_chg_1st, output_frame, *time_offs, env_stab, *last_fec, element_mode, alpha, beta, beta_mute, Xavg );
+#else
         trans_ana( prevsynth + 2 * output_frame - Lprot - *time_offs + ph_ecu_lookahead, mag_chg, &ph_dith, mag_chg_1st, output_frame, *time_offs, env_stab, *last_fec, alpha, beta, beta_mute, Xavg );
+#endif
         spec_ana( prevsynth + 2 * output_frame - Lprot - *time_offs + ph_ecu_lookahead, plocs, plocsi, num_p, X_sav, output_frame, bwidth, element_mode, &noise_fac, pcorr );
 
         if ( prev_bfi && *last_fec )
@@ -2138,11 +2162,15 @@ static void hq_phase_ecu(
 #ifdef FIX_1179_USAN_PHASEECU
             *time_offs = (int16_t) INT16_MAX; /* high value --> continued muting will ensure that the now saturated seed is not creating tones */
 #else
-            *time_offs = MAX16B; /* continued muting will ensure that the now fixed seeds are not creating tones */
+            *time_offs = MAX16B;                                                                                                                                /* continued muting will ensure that the now fixed seeds are not creating tones */
 #endif
         }
 
+#ifdef NONBE_FIX_1180_HQMDCT_PHECU_LT_MUTING
+        trans_ana( prevsynth + 2 * output_frame - Lprot, mag_chg, &ph_dith, mag_chg_1st, output_frame, *time_offs, env_stab, 0, element_mode, alpha, beta, beta_mute, Xavg ); /* 1.0 stable-music,  0.0 speech-like */
+#else
         trans_ana( prevsynth + 2 * output_frame - Lprot, mag_chg, &ph_dith, mag_chg_1st, output_frame, *time_offs, env_stab, 0, alpha, beta, beta_mute, Xavg ); /* 1.0 stable-music,  0.0 speech-like */
+#endif
     }
 
     mvr2r( X_sav, X, Lprot );