diff --git a/lib_com/options.h b/lib_com/options.h
index 7cfe422154dc859de78f1404f205588bc4ef4c74..4e7cfd796f2a91a0ae35151672cd4c28b3ae8145 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -192,6 +192,7 @@
 #define FIX_ISSUE_2008_MISSING_CODE_FROM_PORTING        /* FhG: Issue 2008: Code deleted while porting float-main MR !1504 (BASOP issue 1565)*/
 #define ADJUST_MCT_CHANNELS_MAX                         /* FhG: set correct max mct channels constant*/
 #define FIX_1053_REVERB_RECONFIGURATION
+#define FIX_1179_USAN_PHASEECU                          /* Eri: issue 1179:  better handling of 16 bit wrap around for very long(>200ms) FER-bursts   */
 #define NONBE_1246_INF_COHERENCE_IN_HIGH_LEVEL_DTX      /* Ericsson: Issue 1246: High level input which triggers DTX can lead to numerical overflow in coherence calculation */
 #define TMP_FIX_1119_SPLIT_RENDERING_VOIP               /* FhG: Add error check for unsupported config: split rendering with VoIP mode */
 #define FIX_1113_EXTREND_ISAR                           /* FhG: issue 1113: fix external renderer asserts for FOA/HOA2 and CLDFB config */
diff --git a/lib_dec/FEC_HQ_phase_ecu.c b/lib_dec/FEC_HQ_phase_ecu.c
index 4ad3f28fb15c9e5182cb5a383d9a051f8ac787bb..363447e2f0a16657b29f2c6a50017d2420a09476 100644
--- a/lib_dec/FEC_HQ_phase_ecu.c
+++ b/lib_dec/FEC_HQ_phase_ecu.c
@@ -2089,6 +2089,12 @@ static void hq_phase_ecu(
 
     if ( !prev_bfi || ( prev_bfi && *last_fec && ( *time_offs == output_frame ) ) )
     {
+#ifdef FIX_1179_USAN_PHASEECU
+        if ( !( prev_bfi && *last_fec && ( element_mode == EVS_MONO ) ) )
+        {
+            *time_offs = 0; /* IVAS reset of offset time counter, timeoffset variable later also used to calculate burst length */
+        }
+#else
         if ( prev_bfi && *last_fec && element_mode == EVS_MONO )
         {
             *time_offs += 0;
@@ -2097,13 +2103,30 @@ static void hq_phase_ecu(
         {
             *time_offs = 0;
         }
+#endif
 
         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 );
         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 )
         {
+
+#ifdef FIX_1179_USAN_PHASEECU
+            if ( element_mode != EVS_MONO )
+            {
+                *time_offs = (int16_t) ( *time_offs + output_frame ); /* USAN avoid risk of internal int32_t  in "+="  */
+                if ( *time_offs <= 0 )
+                {                                     /* detected wrap around  of st->time_offs */
+                    *time_offs = (int16_t) INT16_MAX; /* keep a very high value so that the long term muting stays on */
+                }
+            }
+            else
+            {
+                *time_offs = (int16_t) ( *time_offs + output_frame ); /* EVS_MONO BE compatible, but EVS CR needed as wrap will cause burst length muting envelope instability issues */
+            }
+#else
             *time_offs += output_frame;
+#endif
         }
     }
     else
@@ -2112,7 +2135,11 @@ static void hq_phase_ecu(
         if ( *time_offs <= 0 )
         {
             /* detect wrap around  of st->time_offs */
+#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 */
+#endif
         }
 
         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 */
@@ -2124,7 +2151,11 @@ static void hq_phase_ecu(
     seed = *time_offs;
     if ( *num_p > 0 )
     {
+#ifdef FIX_1179_USAN_PHASEECU
+        seed = (int16_t) ( seed + plocs[*num_p - 1] ); /* explicit cast and "+="  not used,  as it "+="  may create a cast from 32 bit to 16 bit, triggering USAN   */
+#else
         seed += plocs[*num_p - 1];
+#endif
     }
 
     subst_spec( plocs, plocsi, num_p, *time_offs, X, mag_chg, ph_dith, old_is_transient, output_frame, &seed, alpha, beta, *beta_mute, Xavg, element_mode, ph_ecu_lookahead, noise_fac );