diff --git a/samples/js/demos/html/pc1_sdp_munge.html b/samples/js/demos/html/pc1_sdp_munge.html
new file mode 100644
index 0000000000..7caf68e397
--- /dev/null
+++ b/samples/js/demos/html/pc1_sdp_munge.html
@@ -0,0 +1,278 @@
+<!DOCTYPE html>
+<html>
+<!-- Load the polyfill to switch-hit between Chrome and Firefox -->
+<script src='../../base/adapter.js'></script>
+<head>
+<title>PC1 SDP Munge Demo</title>
+<style>
+  div#left {
+    float: left;
+    margin: 0 2em 2.5em 0;
+  }
+  div#right {
+    float: left;
+    margin: 0 0 1.5em 0;
+  }
+  div#buttons button {
+    margin: 0 1.3em 1em 0;
+    width: 13em;
+  }
+  div#buttons {
+    max-width: 30em;
+  }
+  div#source {
+    clear: both;
+    margin: 0 0 1em 0;
+  }
+  div#select {
+    margin: 0 0 1em 0;
+  }
+  select {
+    margin: 0 1em 0 0;
+  }
+  h2 {
+    font-size: 1em;
+    font-family: sans-serif;
+    margin: 0 0 0.3em 0;
+    padding: 0;
+  }
+  textarea {
+    height: 20em;
+    width: 98%;
+  }
+  video {
+    background: #666;
+    margin: 0 0 1.5em 0;
+    width: 320px;
+    height: 240px;
+  }
+</style>
+</head>
+<body>
+<div id="left">
+<h2>Local Preview</h2>
+<video id="vid1" autoplay muted></video>
+<h2>Offer SDP</h2>
+<textarea id="offerSdp"></textarea><br><br>
+</div>
+<div id="right">
+<h2>Remote Preview</h2>
+<video id="vid2" autoplay></video>
+<h2>Answer SDP</h2>
+<textarea id="answerSdp"></textarea>
+</div>
+<div id="source">
+<label for="audiosrc">Audio source: </label><select id="audiosrc"></select>
+<label for="videosrc">Video source: </label><select id="videosrc"></select>
+</div>
+<div id="select">Select an audio & video source, then click GetUserMedia:</div>
+<div id="buttons">
+<button id="btnMedia" onclick="getMedia()">GetUserMedia</button>
+<button id="btnCreatePC" onclick="createPC()">Create PeerConnection</button>
+<button id="btnOffer" onclick="createOffer()">Create Offer</button>
+<button id="btnSetOffer" onclick="setOffer()">Set Offer</button>
+<button id="btnAnswer" onclick="createAnswer()">Create Answer</button>
+<button id="btnSetAnswer" onclick="setAnswer()">Set Answer</button>
+<button id="btnHangUp" onclick="hangup()">Hang Up</button>
+</div>
+<script>
+var audio_select = document.getElementById("audiosrc");
+var video_select = document.getElementById("videosrc");
+btnMedia.disabled = false;
+btnCreatePC.disabled = true;
+btnOffer.disabled = true;
+btnSetOffer.disabled = true;
+btnAnswer.disabled = true;
+btnSetAnswer.disabled = true;
+btnHangUp.disabled = true;
+//audio_select.onchange = changeDevices;
+//video_select.onchange = changeDevices;
+var pc1,pc2;
+var localstream;
+var sdpConstraints = {'mandatory': {
+                        'OfferToReceiveAudio':true,
+                        'OfferToReceiveVideo':true }};
+refreshSources();
+
+function refreshSources() {
+  if (webrtcDetectedVersion >= 30) {
+    MediaStreamTrack.getSources(gotSources);
+  } else {
+    alert('Make sure that you have Chrome M30 to test device enumeration api.');
+  }
+}
+
+function gotSources(sourceInfos) {
+  var audio_count = 0;
+  var video_count = 0;
+  audio_select.disabled = true;
+  video_select.disabled = true;
+  audio_select.innerHTML = '';
+  video_select.innerHTML = '';
+  for (var i = 0; i < sourceInfos.length; i++) {
+    var option = document.createElement("option");
+    option.value = sourceInfos[i].id;
+    option.text = sourceInfos[i].label;
+    if (sourceInfos[i].kind === 'audio') {
+      audio_count++;
+      if (option.text === '') {
+        option.text = 'Audio ' + audio_count;
+      }
+      audio_select.appendChild(option);
+    } else {
+      video_count++;
+      if (option.text === '') {
+        option.text = 'Video ' + video_count;
+      }
+      video_select.appendChild(option);
+    }
+  }
+  audio_select.disabled = false;
+  video_select.disabled = false;
+}
+
+function getMedia() {
+  changeDevices();
+  audio_select.disabled = true;
+  video_select.disabled = true;
+  btnMedia.disabled = true;
+  btnCreatePC.disabled = false;
+}
+
+function changeDevices() {
+  var audio_source = null;
+  var video_source = null;
+  if (audio_select.options.length > 0) {
+    audio_source = audio_select.options[audio_select.selectedIndex].value;
+    trace('selected audio_source :' + audio_source);
+  }
+  if (video_select.options.length > 0 ) {
+    video_source = video_select.options[video_select.selectedIndex].value;
+    trace('selected video_source :' + video_source);
+  }
+  setWebcamAndMic(audio_source, video_source);
+}
+
+function setWebcamAndMic(audio_source, video_source) {
+  trace("Requesting local stream");
+  // Call into getUserMedia via the polyfill (adapter.js).
+  getUserMedia({ audio: {optional: [{sourceId: audio_source}]},
+                 video: {optional: [{sourceId: video_source}]}
+               }, gotStream, function() {});
+}
+
+function gotStream(stream) {
+  trace("Received local stream");
+  // Call the polyfill wrapper to attach the media stream to this element.
+  attachMediaStream(vid1, stream);
+  localstream = stream;
+}
+
+function createPC() {
+  btnCreatePC.disabled = true;
+  btnOffer.disabled = false;
+  btnAnswer.disabled = false;
+  btnSetOffer.disabled = false;
+  btnSetAnswer.disabled = false;
+  btnHangUp.disabled = false;
+  trace("Starting call");
+  videoTracks = localstream.getVideoTracks();
+  audioTracks = localstream.getAudioTracks();
+  if (videoTracks.length > 0) {
+    trace('Using Video device: ' + videoTracks[0].label);
+  }
+  if (audioTracks.length > 0) {
+    trace('Using Audio device: ' + audioTracks[0].label);
+  }
+  var servers = null;
+  pc1 = new RTCPeerConnection(servers);
+  trace("Created local peer connection object pc1");
+  pc1.onicecandidate = iceCallback1;
+  pc2 = new RTCPeerConnection(servers);
+  trace("Created remote peer connection object pc2");
+  pc2.onicecandidate = iceCallback2;
+  pc2.onaddstream = gotRemoteStream;
+
+  pc1.addStream(localstream);
+  trace("Adding Local Stream to peer connection");
+}
+
+function createOffer(){
+  pc1.createOffer(gotDescription1,null,null);
+}
+
+function setOffer(){
+  var sdp = document.getElementById("offerSdp").value;
+  var offer = new RTCSessionDescription({type:'offer',sdp:sdp});
+  pc1.setLocalDescription(offer);
+  trace("Modified Offer from pc1 \n" + sdp);
+  pc2.setRemoteDescription(offer);
+}
+
+function gotDescription1(desc) {
+  document.getElementById("offerSdp").disabled = false;
+  document.getElementById("offerSdp").value = desc.sdp;
+}
+
+function createAnswer(){
+  // Since the "remote" side has no media stream we need
+  // to pass in the right constraints in order for it to
+  // accept the incoming offer of audio and video.
+  pc2.createAnswer(gotDescription2, null, sdpConstraints);
+}
+
+function setAnswer(){
+  var sdp = document.getElementById("answerSdp").value;
+  var answer = new RTCSessionDescription({type:'answer',sdp:sdp});
+  pc2.setLocalDescription(answer);
+  trace("Modified Answer from pc2 \n" + sdp);
+  pc1.setRemoteDescription(answer);
+}
+
+function gotDescription2(desc) {
+  document.getElementById("answerSdp").disabled = false;
+  document.getElementById("answerSdp").value = desc.sdp;
+}
+
+function hangup() {
+  trace("Ending call");
+  localstream.stop();
+  pc1.close();
+  pc2.close();
+  pc1 = null;
+  pc2 = null;
+  audio_select.disabled = false;
+  video_select.disabled = false;
+  document.getElementById("offerSdp").disabled = true;
+  document.getElementById("answerSdp").disabled = true;
+  btnMedia.disabled = false;
+  btnCreatePC.disabled = true;
+  btnOffer.disabled = true;
+  btnSetOffer.disabled = true;
+  btnAnswer.disabled = true;
+  btnSetAnswer.disabled = true;
+  btnHangUp.disabled = true;
+}
+
+function gotRemoteStream(e) {
+  // Call the polyfill wrapper to attach the media stream to this element.
+  attachMediaStream(vid2, e.stream);
+  trace("Received remote stream");
+}
+
+function iceCallback1(event) {
+  if (event.candidate) {
+    pc2.addIceCandidate(new RTCIceCandidate(event.candidate));
+    trace("Local ICE candidate: \n" + event.candidate.candidate);
+  }
+}
+
+function iceCallback2(event) {
+  if (event.candidate) {
+    pc1.addIceCandidate(new RTCIceCandidate(event.candidate));
+    trace("Remote ICE candidate: \n " + event.candidate.candidate);
+  }
+}
+</script>
+</body>
+</html>
diff --git a/samples/js/demos/index.html b/samples/js/demos/index.html
index 566cf818fa..a27937b752 100644
--- a/samples/js/demos/index.html
+++ b/samples/js/demos/index.html
@@ -54,6 +54,12 @@ WebRTC overview</a> first.
     <td>
       Shows how to set up a simple 1:1 audio/video call.</td>
   </tr>
+  <tr>
+    <td>
+      <a href="html/pc1_sdp_munge.html">pc1_sdp_munge.html</a></td>
+    <td>
+      Allows you to modify offer/answer sdp with pc1 demo.</td>
+  </tr>
   <tr>
     <td>
       <a href="html/states.html">states.html</a></td>
@@ -95,7 +101,7 @@ WebRTC overview</a> first.
       <a href="html/local-audio-rendering.html">local-audio-rendering.html</a></td>
     <td>
       Shows usage of a local media stream connected to an HTML5 audio tag.</td>
-   </tr>
+  </tr>
   <tr>
     <td>
       <a href="html/webaudio-and-webrtc.html">webaudio-and-webrtc.html</a></td>
