Added setting Opus DTX in munged config for reduction in the audio traffic, when a participant is silent then the audio packet won’t be transmitted.

modules/RTC/TraceablePeerConnection.js

 TraceablePeerConnection.prototype._mungeOpus = function(description) {
     const { audioQuality } = this.options;
 
-    if (!audioQuality?.stereo && !audioQuality?.opusMaxAverageBitrate) {
+    if (!audioQuality?.enableOpusDtx && !audioQuality?.stereo && !audioQuality?.opusMaxAverageBitrate) {
         return description;
     }
 
                 sdpChanged = true;
             }
 
+            // On Firefox, the OpusDtx enablement has no effect
+            if (!browser.isFirefox() && audioQuality?.enableOpusDtx) {
+                fmtpConfig.usedtx = 1;
+                sdpChanged = true;
+            }
+
             if (!sdpChanged) {
                 // eslint-disable-next-line no-continue
                 continue;