diff --git a/shared/js/voice/RecorderBase.ts b/shared/js/voice/RecorderBase.ts
index b44caf82..4503acf3 100644
--- a/shared/js/voice/RecorderBase.ts
+++ b/shared/js/voice/RecorderBase.ts
@@ -91,6 +91,7 @@ namespace audio {
             set_consumer(consumer: InputConsumer) : Promise<void>;
 
             get_filter(type: filter.Type) : filter.Filter | undefined;
+            supports_filter(type: audio.recorder.filter.Type) : boolean;
 
             clear_filter();
             disable_filter(type: filter.Type);
diff --git a/web/js/voice/JavascriptRecorder.ts b/web/js/voice/JavascriptRecorder.ts
index cd6e7131..b23420fc 100644
--- a/web/js/voice/JavascriptRecorder.ts
+++ b/web/js/voice/JavascriptRecorder.ts
@@ -426,6 +426,16 @@ namespace audio {
                 return new_filter as any;
             }
 
+            supports_filter(type: audio.recorder.filter.Type) : boolean {
+                switch (type) {
+                    case audio.recorder.filter.Type.THRESHOLD:
+                    case audio.recorder.filter.Type.STATE:
+                        return true;
+                    default:
+                        return false;
+                }
+            }
+
             private find_filter(type: filter.Type) : filter.JAbstractFilter<AudioNode> | undefined {
                 for(const filter of this._filters)
                     if(filter.type == type)