diff --git a/app.js b/app.js
index 88563c9..e39c1dc 100644
--- a/app.js
+++ b/app.js
@@ -95,18 +95,17 @@ const mediaCodecs = [
     kind: 'audio',
     // mimeType: 'audio/opus',
     // clockRate: 48000,
-    channels: 2,
+    // channels: 2,
     clockRate: 48000,
 		mimeType: "audio/opus",
 		parameters: {
 			minptime: 10,
 			useinbandfec: 1
 		},
-		// payloadType: 111,
-		// rtcpFeedback: [{
-    //   parameter: "",
-    //   type: "transport-cc"
-		// }]
+		rtcpFeedback: [{
+      parameter: "",
+      type: "transport-cc"
+		}]
   },
   {
     kind: 'video',