diff --git a/lib_com/options.h b/lib_com/options.h
index 9022d06b7b55193a227a8e980da458ac6b4edf4a..ebf94e73fed1e3932cdb511eb990b8de0c69335f 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -212,6 +212,7 @@
 #define FIX_587_DEFAULT_REVERB                          /* Philips: issue 587: inconsistent default reverb parameters across renderers */
 #define NONBE_1214_PLC_LSF_MEMORY                       /* VA: issue 1224: reset ACELP PLC FEC memory in case of switching from MDCT stereo to TD/DFT stereo */
 #define NONBE_1293_SR_HRTF                              /* VA: issue 1293: add support of external HRTFs in split rendering */
+#define NONBE_1220_OMASA_JBM_BRATE_SW_FLUSH             /* VA: issue 1220: fix bug in renderer flush in OMASA 1ISM JBM bitrate switching */
 
 /* #################### End BASOP porting switches ############################ */
 
diff --git a/lib_dec/ivas_jbm_dec.c b/lib_dec/ivas_jbm_dec.c
index 29d29c2a464ca804782f4fb0996fa8a4cfbafd05..dacbbf159cf62341d8d2449dfa2959fa7fc95945 100644
--- a/lib_dec/ivas_jbm_dec.c
+++ b/lib_dec/ivas_jbm_dec.c
@@ -1538,7 +1538,7 @@ ivas_error ivas_jbm_dec_render(
 
 
 /*--------------------------------------------------------------------------*
- * ivas_jbm_dec_dec_flush_renderer()
+ * ivas_jbm_dec_flush_renderer()
  *
  * Flush samples if renderer granularity changes on a bitrate change
  *--------------------------------------------------------------------------*/
@@ -1696,7 +1696,11 @@ ivas_error ivas_jbm_dec_flush_renderer(
         {
             if ( ism_mode_old == ISM_MASA_MODE_DISC )
             {
+#ifdef NONBE_1220_OMASA_JBM_BRATE_SW_FLUSH
+                float *tc_local[MAX_NUM_OBJECTS];
+#else
                 float *tc_local[MAX_TRANSPORT_CHANNELS];
+#endif
 
                 for ( ch_idx = 0; ch_idx < st_ivas->nchan_ism; ch_idx++ )
                 {
@@ -1704,6 +1708,12 @@ ivas_error ivas_jbm_dec_flush_renderer(
                     mvr2r( st_ivas->hMasaIsmData->delayBuffer[ch_idx], tc_local[ch_idx], st_ivas->hMasaIsmData->delayBuffer_size );
                 }
 
+#ifdef NONBE_1220_OMASA_JBM_BRATE_SW_FLUSH
+                if ( ( error = ivas_td_binaural_renderer_sf( st_ivas, p_output, hTcBuffer->n_samples_granularity ) ) != IVAS_ERR_OK )
+                {
+                    return error;
+                }
+#else
                 if ( st_ivas->nchan_ism > 0 )
                 {
                     if ( ( error = ivas_td_binaural_renderer_sf( st_ivas, p_output, hTcBuffer->n_samples_granularity ) ) != IVAS_ERR_OK )
@@ -1720,6 +1730,7 @@ ivas_error ivas_jbm_dec_flush_renderer(
                     st_ivas->hTcBuffer->slots_rendered += 1;
                     st_ivas->hTcBuffer->subframes_rendered += 1;
                 }
+#endif
             }
         }
         else if ( st_ivas->ivas_format == SBA_ISM_FORMAT )
diff --git a/lib_dec/ivas_objectRenderer_internal.c b/lib_dec/ivas_objectRenderer_internal.c
index 1aa0508094a5cf0333905fadeaee2940b4fe9adf..804b5fef6515b4f3343f260b49bf9d10b3f8904b 100644
--- a/lib_dec/ivas_objectRenderer_internal.c
+++ b/lib_dec/ivas_objectRenderer_internal.c
@@ -97,11 +97,15 @@ ivas_error ivas_td_binaural_renderer_sf(
     int16_t nchan_ism_internal, nchan_ism, ch_offset;
 
     /* Set the number of ISMs */
+#ifdef NONBE_1220_OMASA_JBM_BRATE_SW_FLUSH
+    if ( st_ivas->ivas_format == MASA_ISM_FORMAT || ( st_ivas->ivas_format == MASA_FORMAT && st_ivas->nchan_ism > 0 ) )
+#else
     if ( st_ivas->ivas_format == MASA_ISM_FORMAT )
+#endif
     {
         nchan_ism_internal = st_ivas->nchan_ism;
         nchan_ism = st_ivas->nchan_ism;
-        ch_offset = 2;
+        ch_offset = CPE_CHANNELS;
     }
     else if ( st_ivas->ivas_format == SBA_ISM_FORMAT )
     {
diff --git a/lib_dec/ivas_omasa_dec.c b/lib_dec/ivas_omasa_dec.c
index 6777981bffa2e69dcb3730a9e36256038ad62c7f..6a98f9b1bc8cd4c28ae92cc9192b5e6b3187dff0 100644
--- a/lib_dec/ivas_omasa_dec.c
+++ b/lib_dec/ivas_omasa_dec.c
@@ -782,7 +782,7 @@ void ivas_omasa_dirac_rend_jbm(
 
 
 /*--------------------------------------------------------------------------*
- * ivas_omasa_dirac_td_binaural_render()
+ * ivas_omasa_dirac_td_binaural_jbm()
  *
  * Binaural rendering in OMASA format for JBM
  *--------------------------------------------------------------------------*/
@@ -797,19 +797,30 @@ ivas_error ivas_omasa_dirac_td_binaural_jbm(
 )
 {
     int16_t n;
+#ifdef NONBE_1220_OMASA_JBM_BRATE_SW_FLUSH
+    float data_separated_objects[BINAURAL_CHANNELS][L_FRAME48k];
+#else
     float data_separated_objects[MAX_NUM_OBJECTS][L_FRAME48k];
+#endif
     ivas_error error;
+#ifdef NONBE_1220_OMASA_JBM_BRATE_SW_FLUSH
+    float *p_sepobj[BINAURAL_CHANNELS];
+#else
     float *p_sepobj[MAX_NUM_OBJECTS];
+#endif
     int16_t slot_idx_start;
 
     slot_idx_start = st_ivas->hSpatParamRendCom->slots_rendered;
 
+#ifdef NONBE_1220_OMASA_JBM_BRATE_SW_FLUSH
+    for ( n = 0; n < BINAURAL_CHANNELS; n++ )
+#else
     for ( n = 0; n < MAX_NUM_OBJECTS; n++ )
+#endif
     {
         p_sepobj[n] = &data_separated_objects[n][0];
     }
 
-
     ivas_dirac_dec_binaural_render( st_ivas, nSamplesAsked, nSamplesRendered, nSamplesAvailable, nchan_transport, output_f );
 
     /* reset combined orientation access index before calling the td renderer */
@@ -861,6 +872,7 @@ ivas_error ivas_omasa_dirac_td_binaural_jbm(
             v_add( output_f[n], p_sepobj[n], output_f[n], *nSamplesRendered );
         }
     }
+
     return IVAS_ERR_OK;
 }