diff --git a/app.js b/app.js
index 3edb742..2a92d39 100644
--- a/app.js
+++ b/app.js
@@ -90,31 +90,56 @@ worker = createWorker();
 // https://mediasoup.org/documentation/v3/mediasoup/rtp-parameters-and-capabilities/#RtpCodecCapability
 // list of media codecs supported by mediasoup ...
 // https://github.com/versatica/mediasoup/blob/v3/src/supportedRtpCapabilities.ts
-const mediaCodecs = [
+const mediaCodecs = 			[
   {
-    kind: 'audio',
-    // mimeType: 'audio/opus',
-    // clockRate: 48000,
-    // channels: 2,
-    clockRate: 48000,
-		mimeType: "audio/opus", // https://developer.mozilla.org/en-US/docs/Web/Media/Formats/WebRTC_codecs#supported_audio_codecs
-		parameters: {
-			minptime: 10,
-			useinbandfec: 1
-		},
-		rtcpFeedback: [{
-      parameter: "",
-      type: "transport-cc"
-		}]
+    kind      : 'audio',
+    mimeType  : 'audio/opus',
+    clockRate : 48000,
+    channels  : 2
   },
   {
-    kind: 'video',
-    mimeType: 'video/VP8', // https://developer.mozilla.org/en-US/docs/Web/Media/Formats/WebRTC_codecs#supported_video_codecs
-    clockRate: 90000,
-    parameters: {
-      'x-google-start-bitrate': 1000,
-    },
+    kind       : 'video',
+    mimeType   : 'video/VP8',
+    clockRate  : 90000,
+    parameters :
+    {
+      'x-google-start-bitrate' : 1000
+    }
   },
+  {
+    kind       : 'video',
+    mimeType   : 'video/VP9',
+    clockRate  : 90000,
+    parameters :
+    {
+      'profile-id'             : 2,
+      'x-google-start-bitrate' : 1000
+    }
+  },
+  {
+    kind       : 'video',
+    mimeType   : 'video/h264',
+    clockRate  : 90000,
+    parameters :
+    {
+      'packetization-mode'      : 1,
+      'profile-level-id'        : '4d0032',
+      'level-asymmetry-allowed' : 1,
+      'x-google-start-bitrate'  : 1000
+    }
+  },
+  {
+    kind       : 'video',
+    mimeType   : 'video/h264',
+    clockRate  : 90000,
+    parameters :
+    {
+      'packetization-mode'      : 1,
+      'profile-level-id'        : '42e01f',
+      'level-asymmetry-allowed' : 1,
+      'x-google-start-bitrate'  : 1000
+    }
+  }
 ];
 
 const closeCall = (callId) => {