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diff --git a/dom/media/webrtc/tests/mochitests/test_peerConnection_telephoneEventFirst.html b/dom/media/webrtc/tests/mochitests/test_peerConnection_telephoneEventFirst.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <script type="application/javascript" src="pc.js"></script>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+createHTML({
+  title: "RTCPeerConnection with telephone-event codec first in SDP",
+  bug: "1581898",
+  visible: true
+});
+
+const test = async () => {
+  const pc1 = new RTCPeerConnection();
+  const pc2 = new RTCPeerConnection();
+  const stream = await navigator.mediaDevices.getUserMedia({audio:true});
+  pc1.addTrack(stream.getAudioTracks()[0], stream);
+  pc2.addTrack(stream.getAudioTracks()[0], stream);
+
+  const offer = await pc1.createOffer();
+  await pc1.setLocalDescription(offer);
+
+  const regex = /^(m=audio \d+ [^ ]+) (.*) 101(.*)$/m;
+
+  // Rewrite offer so payload type 101 comes first
+  offer.sdp = offer.sdp.replace(regex, '$1 101 $2 $3');
+
+  ok(offer.sdp.match(/^m=audio \d+ [^ ]+ 101 /m),
+     "Payload type 101 should be first on the m-line");
+
+  await pc2.setRemoteDescription(offer);
+  const answer = await pc2.createAnswer();
+
+  pc1.onicecandidate = e => { pc2.addIceCandidate(e.candidate); }
+  pc2.onicecandidate = e => { pc1.addIceCandidate(e.candidate); }
+
+  await pc1.setRemoteDescription(answer);
+  await pc2.setLocalDescription(answer);
+  await new Promise(resolve => {
+    pc1.oniceconnectionstatechange = e => {
+      if (pc1.iceConnectionState == "connected") {
+        resolve();
+      }
+    };
+  });
+  await wait(1000);
+};
+
+runNetworkTest(test);
+
+</script>
+</pre>
+</body>
+</html>