diff --git a/lib_com/options.h b/lib_com/options.h
index c22bf2825f41286c10659e19e2fe2b20d2b45c8f..7147a49308d53bc0f27ddcf9c74e3cd01653b456 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -148,32 +148,16 @@
 
 #define SNS_MSVQ                                        /* FhG: contribution 33 - MSVQ for SNS parameters at stereo mid bitrates */
 
-#define SBA2MONO                                        /* FhG: Issue 365: Adapt processing of SBA mono output to be in line with stereo output (less delay, lower complexity) */
-#define FIX_379_EXT_METADATA                            /* Eri: Extended metadata issues */
-#define FIX_379_ANGLE                                   /* Eri: Extended metadata issues related to angle structure */
 #define FIX_379_GAININTP                                /* Eri: Adds a gain interpolation for directional/distance gain to handle abrupt changes in metadata (Non BE) */
 
-#define NOKIA_PARAMBIN_REQULARIZATION                   /* Nokia: Contribution - Configured reqularization factor for parametric binauralizer. */
-#define NOKIA_ADAPTIVE_BINAURAL_PROTOS                  /* Nokia: Contribution 28: Adaptive binaural prototypes */
-#define NOKIA_ADAPTIVE_BINAURAL_PROTOS_OPT              /* Nokia: enable adaptive binaural prototype complexity optimizations */
-
-#define FIX_389_EXT_REND_PCM_SR                         /* Nokia: Issue 389: Fix assignment of sample rate with PCM input. */
-#define FIX_390_EXT_REND_MASA_META_COPY                 /* Nokia: Issue 390: Fixes MASA metadata copying to renderer. */
-#define FIX_392_LATE_REVERB                             /* DLB : Issue 392: keep late reverb by default off when output config is not BINAURAL_ROOM*/
-
-#define FIX_ISM_DTX_CLICKS                              /* FhG: fix for clicks in ISM DTX for inactive to active TCX transitions */
-
-#define ISSUE_24_CLEANUP_MCT_LFE                        /* Issue 24: Cleanup LFE path withing MCT */ 
-
-#define FIX_401_DIRAC_RENDERER_META_READ_INDICES        /* Nokia: Issue 401: Fix metadata reading indices in DirAC renderer. */
-
-#define FIX_406_IVAS_POSITION                           /* Eri: Issue 406: Unify IVAS_POSITION to use IVAS_VECTOR3 instead */
-#define REND_DEBUGGING_REVISION                         /* VA: encapsulate rendering debugging options with DEBUGGING */
 #define FIX_418_SID_BITRATE                             /* Eri: Issue 418: Using the correct bitrate for unified stereo SID */
 #define PARAMMC_SHORT_ENC_MDFT                          /* FhG: Issue 410: complexity optimization for parametric Multichannel modes */
 #define FIX_421_TD_INT_TUNE                             /* Eri: Issue 421: Increase use of interpolation in TD renderer filter transition */
-
+#define FIX_419_ISM_BRATE_SW_DTX                        /* VA: issue 419: fix ISM Bitrate Switching with dtx */
 #define FIX_422                                         /* FhG: Issue 422: re-introduce fix for noisy speech buffer in ParamISM */
+
+
+
 /* ################## End DEVELOPMENT switches ######################### */
 /* clang-format on */
 #endif
diff --git a/lib_dec/ivas_ism_metadata_dec.c b/lib_dec/ivas_ism_metadata_dec.c
index 0135ec06f053f1bd22cf1c284c46ce1d0237fb8e..7a61424a1fd3d73b6d5e6b51aecabbcf94993fb1 100644
--- a/lib_dec/ivas_ism_metadata_dec.c
+++ b/lib_dec/ivas_ism_metadata_dec.c
@@ -451,9 +451,14 @@ ivas_error ivas_ism_metadata_dec(
         {
             hIsmMeta[ch]->last_ism_metadata_flag = hIsmMeta[ch]->ism_metadata_flag;
 
+#ifdef FIX_419_ISM_BRATE_SW_DTX
+            hSCE[ch]->hCoreCoder[0]->low_rate_mode = 0;
+#endif
             if ( ism_mode == ISM_MODE_DISC )
             {
+#ifndef FIX_419_ISM_BRATE_SW_DTX
                 hSCE[ch]->hCoreCoder[0]->low_rate_mode = 0;
+#endif
                 if ( hIsmMeta[ch]->ism_metadata_flag == 0 && localVAD[ch] == 0 && ism_metadata_flag_global )
                 {
                     hSCE[ch]->hCoreCoder[0]->low_rate_mode = 1;
diff --git a/lib_enc/ivas_ism_metadata_enc.c b/lib_enc/ivas_ism_metadata_enc.c
index 82a9fe4f8ac06431f661eab4850daf5c3e65ae66..e5e1e991562b717c77bf2abb9e0b748a9816133a 100644
--- a/lib_enc/ivas_ism_metadata_enc.c
+++ b/lib_enc/ivas_ism_metadata_enc.c
@@ -466,9 +466,14 @@ ivas_error ivas_ism_metadata_enc(
 
     for ( ch = 0; ch < nchan_transport; ch++ )
     {
+#ifdef FIX_419_ISM_BRATE_SW_DTX
+        hSCE[ch]->hCoreCoder[0]->low_rate_mode = 0;
+#endif
         if ( ism_mode == ISM_MODE_DISC )
         {
+#ifndef FIX_419_ISM_BRATE_SW_DTX
             hSCE[ch]->hCoreCoder[0]->low_rate_mode = 0;
+#endif
             if ( hIsmMeta[ch]->ism_metadata_flag == 0 && localVAD[ch] == 0 && ism_metadata_flag_global )
             {
                 hSCE[ch]->hCoreCoder[0]->low_rate_mode = 1;