diff --git a/lib_com/options.h b/lib_com/options.h
index 5d1376c88738c6076308c2a24cf64e556d4266b1..6dea2ea9d7bfba2b2ffc7b720c8e6266146cdb1a 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -173,9 +173,9 @@
 #define NONBE_1273_ISM_METADATA_COUNTER                 /* VA: issue 1273: fix counter overflow in ISM metadata encoder */
 #define NONBE_1279_COUNTER_OVERFLOW                     /* VA: issue 1279: Avoid possible overflow of counter st->Nb_ACELP_frames */
 #define NONBE_1244_FIX_SWB_BWE_MEMORY                   /* VA: issue 1244: fix to SWB BWE memory in case of switching from FB coding - pending a review by Huawei */ 
+#define NONBE_FIX_1180_HQMDCT_PHECU_LT_MUTING           /* Ericsson: issue 1180, corrected long term mute loop attnuation after 200ms  in PhECU-PLC  */
 #define NONBE_FIX_1277_EVS_DTX_HIGH_RATE_THRESHOLD      /* VA/Eri: issue 1277: Fix Mismatch in DTX high-rate threshold between EVS float and BASOP */
 
-
 #define NONBE_1231_BASOP_819_THRESHOLD_MASA2TOTAL        /* Nokia: add fix for precision limitation in comparison with masa2total energy ratio threshold to be aligned with BASOP*/
 /* ##################### End NON-BE switches ########################### */
 
diff --git a/lib_dec/FEC_HQ_phase_ecu.c b/lib_dec/FEC_HQ_phase_ecu.c
index b908d7668d43cace9ebfc8f9f9b4f8c3f70e7a58..7e7e5d2f07b5485f17a48c28220ba3d43b28a841 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 +419,27 @@ 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 )
@@ -2094,7 +2114,11 @@ static void hq_phase_ecu(
             *time_offs = 0; /* IVAS reset of offset time counter, timeoffset variable later also used to calculate burst length */
         }
 
+#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 )
@@ -2122,7 +2146,11 @@ static void hq_phase_ecu(
             *time_offs = (int16_t) INT16_MAX; /* high value --> continued muting will ensure that the now saturated  seed is not creating tones */
         }
 
+#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 );
diff --git a/scripts/config/self_test.prm b/scripts/config/self_test.prm
index 84692916e10226eb0a7064ec92f69a98a1474c95..5b3df2cf08b1e7962b1076ee4a65a748c408e5c3 100644
--- a/scripts/config/self_test.prm
+++ b/scripts/config/self_test.prm
@@ -210,6 +210,11 @@ eid-xor -fer -vbr -bs g192 -ep g192 bit ../scripts/dly_error_profiles/ep_5pct.g1
 eid-xor -fer -vbr -bs g192 -ep g192 bit ../scripts/dly_error_profiles/ep_5pct.g192 bit_error
 ../IVAS_dec MONO 16 bit_error testv/stvST48n.wav_stereo_32000_48-16_DTX_MONO_FER5.tst
 
+// stereo at 32 kbps, 48kHz in, 48kHz out, random FER at 18% with long bursts
+../IVAS_cod -stereo 32000 48 testv/stvST48c.wav bit
+eid-xor -fer -vbr -bs g192 -ep g192 bit ../scripts/dly_error_profiles/ep_18pct_longburst.g192 bit_error
+../IVAS_dec STEREO 48 bit_error testv/stvST48c.wav_stereo_32000_48-48_STEREO_FER5_BURST.tst
+
 // stereo at 48 kbps, 16kHz in, 16kHz out
 ../IVAS_cod -stereo 48000 16 testv/stvST16c.wav bit
 ../IVAS_dec STEREO 16 bit testv/stvST16c.wav_stereo_48000_16-16.tst
diff --git a/scripts/config/self_test_ltv.prm b/scripts/config/self_test_ltv.prm
index f39d56370b596004e39d1f13898ff01fe54bef93..2aad90886b5a3bc9801cf867af46dff8cb95b0b9 100644
--- a/scripts/config/self_test_ltv.prm
+++ b/scripts/config/self_test_ltv.prm
@@ -210,6 +210,11 @@ eid-xor -fer -vbr -bs g192 -ep g192 bit ../scripts/dly_error_profiles/ep_5pct.g1
 eid-xor -fer -vbr -bs g192 -ep g192 bit ../scripts/dly_error_profiles/ep_5pct.g192 bit_error
 ../IVAS_dec MONO 16 bit_error testv/ltv48_STEREO.wav_stereo_32000_48-16_DTX_MONO_FER5.tst
 
+// stereo at 32 kbps, 48kHz in, 48kHz out, random FER at 18% with long bursts
+../IVAS_cod -stereo 32000 48 testv/ltv48_STEREO.wav bit
+eid-xor -fer -vbr -bs g192 -ep g192 bit ../scripts/dly_error_profiles/ep_18pct_longburst.g192 bit_error
+../IVAS_dec STEREO 48 bit_error testv/ltv48_STEREO.wav_stereo_32000_48-48_STEREO_FER5_BURST.tst
+
 // stereo at 48 kbps, 16kHz in, 16kHz out
 ../IVAS_cod -stereo 48000 16 testv/ltv16_STEREO.wav bit
 ../IVAS_dec STEREO 16 bit testv/ltv16_STEREO.wav_stereo_48000_16-16.tst
diff --git a/scripts/dly_error_profiles/ep_18pct_longburst.g192 b/scripts/dly_error_profiles/ep_18pct_longburst.g192
new file mode 100644
index 0000000000000000000000000000000000000000..8653cbf8c31f565696245bfa66d2f1db10974757
--- /dev/null
+++ b/scripts/dly_error_profiles/ep_18pct_longburst.g192
@@ -0,0 +1 @@
+!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k!k!k!k!k!k!k!k!k!k!k!k!k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k!k k!k!k!k!k!k k!k!k k!k!k
\ No newline at end of file