diff --git a/lib_com/options.h b/lib_com/options.h
index 1fe1bb999c0a93da0b9acc0a615e6c4efe3f6b4a..e28fdad63b1f9887828c00f58395dfc1075a116b 100755
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -156,6 +156,7 @@
 #define FIX_565_SBA_BURST_IN_FEC                        /* VA: Issue 565: Fix noise burst during FEC, due to wrong total_brate initialization */
 #define FIX_562_ISM2_64KBPS                             /* VA: issue 562: fix ISM2 at 64kbps issue */
 #define FIX_559_EXTL_IGF_MISMATCH                       /* VA: issue 559: fix mismatch between st->extl and st->igf observed as crash in PlanarSBA bitrate switching */
+#define FIX_571_REVERB_NOT_ACTIVATED_ISM                /* Philips: Issue 571: Reverb not activated for discrete and parametric ISM */
 #define FIX_572_LFE_LPF_ENC                             /* FhG: issue 572: always apply the low pass filter to the LFE channel */
 #define FIX_QMETA_SID_5k2                               /* Nokia: Issue 137: enable using full 5.2k bitrate in MASA SID */
 #define FIX_578_PARAMMC_ILD_BS                          /* FhG: Issue 578: transmitt also center ILD in band 0 when LFE is active in 3TC ParamMC */
diff --git a/lib_dec/ivas_binRenderer_internal.c b/lib_dec/ivas_binRenderer_internal.c
index 5bd09236e0e40471c499b7d55495a096578e0c4f..b3c31a97942b309447665690a9b31b9829d58b5d 100644
--- a/lib_dec/ivas_binRenderer_internal.c
+++ b/lib_dec/ivas_binRenderer_internal.c
@@ -723,7 +723,11 @@ ivas_error ivas_binRenderer_open(
     }
 
     /* Allocate memories needed for reverb module */
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+    if ( st_ivas->renderer_type == RENDERER_BINAURAL_FASTCONV && st_ivas->hIntSetup.output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB )
+#else
     if ( st_ivas->renderer_type == RENDERER_BINAURAL_FASTCONV_ROOM && st_ivas->hIntSetup.output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB )
+#endif
     {
         if ( ( error = ivas_binaural_reverb_open( &( hBinRenderer->hReverb ),
                                                   hBinRenderer->conv_band,
@@ -731,7 +735,11 @@ ivas_error ivas_binRenderer_open(
                                                   &( st_ivas->hRenderConfig->roomAcoustics ),
                                                   st_ivas->hIntSetup.output_config,
                                                   st_ivas->hDecoderConfig->output_Fs,
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+                                                  RENDERER_BINAURAL_FASTCONV,
+#else
                                                   RENDERER_BINAURAL_FASTCONV_ROOM,
+#endif
                                                   st_ivas->hHrtfFastConv,
                                                   st_ivas->hHrtfParambin ) ) != IVAS_ERR_OK )
         {
diff --git a/lib_dec/ivas_ism_dec.c b/lib_dec/ivas_ism_dec.c
index c031ec8c4bd36f36f7cd001f840f9ebfaeffa7ff..5533fcd6b356fe55ee4b2d5d28a14c3fb98ea765 100644
--- a/lib_dec/ivas_ism_dec.c
+++ b/lib_dec/ivas_ism_dec.c
@@ -184,6 +184,15 @@ static ivas_error ivas_ism_bitrate_switching(
                 {
                     return error;
                 }
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+                if ( st_ivas->hIntSetup.output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB )
+                {
+                    if ( ( error = ivas_reverb_open( &st_ivas->hReverb, st_ivas->hDecoderConfig->output_config, NULL, st_ivas->hRenderConfig, st_ivas->hDecoderConfig->output_Fs ) ) != IVAS_ERR_OK )
+                    {
+                        return error;
+                    }
+                }
+#endif
             }
         }
         else
@@ -258,6 +267,14 @@ static ivas_error ivas_ism_bitrate_switching(
                 {
                     st_ivas->hHrtfTD = NULL;
                 }
+
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+                if ( st_ivas->hOutSetup.output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB )
+                {
+                    ivas_reverb_close( &st_ivas->hReverb );
+                }
+
+#endif
             }
         }
         else
diff --git a/lib_dec/ivas_output_config.c b/lib_dec/ivas_output_config.c
index 16787b63cdd383b24bb8b3c93fe50513e1bca5d3..94e22ea419186ad6fbd932081aa4ab8fdbc279a0 100644
--- a/lib_dec/ivas_output_config.c
+++ b/lib_dec/ivas_output_config.c
@@ -82,7 +82,11 @@ void ivas_renderer_select(
         {
             if ( st_ivas->ism_mode == ISM_MODE_PARAM )
             {
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+                if ( output_config == AUDIO_CONFIG_BINAURAL )
+#else
                 if ( output_config == AUDIO_CONFIG_BINAURAL || output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB )
+#endif
                 {
                     *renderer_type = RENDERER_BINAURAL_PARAMETRIC;
                 }
@@ -104,11 +108,19 @@ void ivas_renderer_select(
                     else
                     {
                         *renderer_type = RENDERER_BINAURAL_OBJECTS_TD;
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+                        *internal_config = output_config;
+#else
                         *internal_config = AUDIO_CONFIG_BINAURAL;
+#endif
                     }
 #else
                     *renderer_type = RENDERER_BINAURAL_OBJECTS_TD;
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+                    *internal_config = output_config;
+#else
                     *internal_config = AUDIO_CONFIG_BINAURAL;
+#endif
 #endif
                 }
                 else
@@ -139,7 +151,11 @@ void ivas_renderer_select(
         else if ( st_ivas->ivas_format == SBA_FORMAT )
         {
             *internal_config = AUDIO_CONFIG_HOA3;
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+            if ( output_config == AUDIO_CONFIG_BINAURAL || output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB )
+#else
             if ( output_config == AUDIO_CONFIG_BINAURAL )
+#endif
             {
                 *renderer_type = RENDERER_BINAURAL_FASTCONV;
             }
@@ -187,7 +203,11 @@ void ivas_renderer_select(
             else
             {
                 *internal_config = transport_config;
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+                if ( output_config == AUDIO_CONFIG_BINAURAL || output_config == AUDIO_CONFIG_BINAURAL_ROOM_REVERB )
+#else
                 if ( output_config == AUDIO_CONFIG_BINAURAL )
+#endif
                 {
 #ifdef DEBUGGING
                     if ( ( ( ( st_ivas->transport_config == AUDIO_CONFIG_5_1 || st_ivas->transport_config == AUDIO_CONFIG_7_1 ) && ( st_ivas->hDecoderConfig->Opt_Headrotation || st_ivas->hDecoderConfig->Opt_ExternalOrientation ) ) || ( st_ivas->hDecoderConfig->force_rend == FORCE_TD_RENDERER ) ) && ( st_ivas->mc_mode == MC_MODE_MCT || st_ivas->mc_mode == MC_MODE_PARAMUPMIX ) && !( st_ivas->hDecoderConfig->force_rend == FORCE_CLDFB_RENDERER ) )
diff --git a/lib_rend/ivas_reverb.c b/lib_rend/ivas_reverb.c
index 6374b6812e98f6d53829eb3a6566dcfaf28c14e9..0ec7e1f1f4f5b6dd9bd63e53c5c1e428cc20c254 100644
--- a/lib_rend/ivas_reverb.c
+++ b/lib_rend/ivas_reverb.c
@@ -1813,7 +1813,11 @@ ivas_error ivas_binaural_reverb_open(
         set_f( hReverb->preDelayBufferImag[k], 0.0f, hReverb->numBins );
     }
 
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+    if ( renderer_type == RENDERER_BINAURAL_FASTCONV )
+#else
     if ( renderer_type == RENDERER_BINAURAL_FASTCONV_ROOM )
+#endif
     {
         if ( !roomAcoustics->override )
         {
@@ -1900,7 +1904,11 @@ ivas_error ivas_binaural_reverb_open(
     }
     else
     {
+#ifdef FIX_571_REVERB_NOT_ACTIVATED_ISM
+        if ( renderer_type == RENDERER_BINAURAL_FASTCONV )
+#else
         if ( renderer_type == RENDERER_BINAURAL_FASTCONV_ROOM )
+#endif
         {
             ivas_binaural_reverb_setReverbTimes( hReverb, sampling_rate, hHrtfFastConv->fastconvReverberationTimes, hHrtfFastConv->fastconvReverberationEneCorrections );
             ivas_binaural_reverb_setPreDelay( hReverb, 10 );