diff --git a/lib_com/options.h b/lib_com/options.h
index 8b22dc430b84cf629e28cebd799f8d538207ae4a..23f991793e03078e44794c7b8d7e1b49d803d1c9 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -162,7 +162,7 @@
 #define TMP_FIX_1119_SPLIT_RENDERING_VOIP               /* FhG: Add error check for unsupported config: split rendering with VoIP mode */
 #define FIX_1228_SAMPLING_RATE_MISMATCH_IN_HRTF_FILE    /* VA: issue 1228: Exit the processing when a HRTF binary file with wrong sampling rate is provided */
 #define FIX_1225_DISCLAIMER                             /* VA: issue 1225: Add disclaimer for external renderer + Add info about IVAS reference version */
-
+#define FIX_1179_USAN_PHASEECU                          /* Eri: issue 1179:  better handling of 16 bit wrap around for very long(>200ms) FER-bursts   */
 /* #################### End BE switches ################################## */
 
 /* #################### Start NON-BE switches ############################ */
diff --git a/lib_dec/FEC_HQ_phase_ecu.c b/lib_dec/FEC_HQ_phase_ecu.c
index 425ff21fe97a693c36a11f224bfd4b6366fc0ab3..a500166677e6702bee12634bbdda9e17477a93f9 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;
@@ -2097,22 +2103,46 @@ 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
     {
+#ifdef FIX_1179_USAN_PHASEECU
+        *time_offs = (int16_t) ( *time_offs + output_frame ); /* cast added for USAN, "+=" avoided as it may creat a truncation from int to int16_t  */
+#else
         *time_offs += output_frame;
+#endif
         if ( *time_offs <= 0 )
         {
             /* detect wrap around  of st->time_offs */
-            *time_offs = MAX16B; /* continued muting will ensure that the now fixed seeds are not creating tones */
+#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;
+#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 +2154,11 @@ 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 );