diff --git a/samples/js/apprtc/js/main.js b/samples/js/apprtc/js/main.js
index f96446bbc0..89ccffc987 100644
--- a/samples/js/apprtc/js/main.js
+++ b/samples/js/apprtc/js/main.js
@@ -275,12 +275,21 @@ function processSignalingMessage(message) {
     var candidate = new RTCIceCandidate({sdpMLineIndex: message.label,
                                          candidate: message.candidate});
     noteIceCandidate("Remote", iceCandidateType(message.candidate));
-    pc.addIceCandidate(candidate);
+    pc.addIceCandidate(candidate,
+                       onAddIceCandidateSuccess, onAddIceCandidateError);
   } else if (message.type === 'bye') {
     onRemoteHangup();
   }
 }
 
+function onAddIceCandidateSuccess() {
+  console.log('AddIceCandidate success.');
+}
+
+function onAddIceCandidateError(error) {
+  messageError('Failed to add Ice Candidate: ' + error.toString());
+}
+
 function onChannelOpened() {
   console.log('Channel opened.');
   channelReady = true;
diff --git a/samples/js/demos/html/constraints-and-stats.html b/samples/js/demos/html/constraints-and-stats.html
index f74bda943c..509776b4cc 100644
--- a/samples/js/demos/html/constraints-and-stats.html
+++ b/samples/js/demos/html/constraints-and-stats.html
@@ -86,13 +86,15 @@ function connect() {
   pc1.onicecandidate = function(e) {
     log('Candidate PC1');
     if (e.candidate) {
-      pc2.addIceCandidate(new RTCIceCandidate(e.candidate));
+      pc2.addIceCandidate(new RTCIceCandidate(e.candidate),
+                          onAddIceCandidateSuccess, onAddIceCandidateError);
     }
   }
   pc2.onicecandidate = function(e) {
     log('Candidate PC2');
     if (e.candidate) {
-      pc1.addIceCandidate(new RTCIceCandidate(e.candidate));
+      pc1.addIceCandidate(new RTCIceCandidate(e.candidate),
+                          onAddIceCandidateSuccess, onAddIceCandidateError);
     }
   }
   pc2.onaddstream = function(e) {
@@ -112,6 +114,14 @@ function connect() {
   });
 }
 
+function onAddIceCandidateSuccess() {
+  trace("AddIceCandidate success.");
+}
+
+function onAddIceCandidateError(error) {
+  trace("Failed to add Ice Candidate: " + error.toString());
+}
+
 // Augumentation of stats entries with utility functions.
 // The augumented entry does what the stats entry does, but adds
 // utility functions.
diff --git a/samples/js/demos/html/dc1.html b/samples/js/demos/html/dc1.html
index 0dc9a4431e..694ca5df04 100644
--- a/samples/js/demos/html/dc1.html
+++ b/samples/js/demos/html/dc1.html
@@ -175,7 +175,8 @@ function gotDescription2(desc) {
 function iceCallback1(event) { 
   trace('local ice callback');
   if (event.candidate) {
-    pc2.addIceCandidate(event.candidate);
+    pc2.addIceCandidate(event.candidate,
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace('Local ICE candidate: \n' + event.candidate.candidate);
   }
 }
@@ -183,11 +184,20 @@ function iceCallback1(event) {
 function iceCallback2(event) {
   trace('remote ice callback');
   if (event.candidate) {
-    pc1.addIceCandidate(event.candidate);
+    pc1.addIceCandidate(event.candidate,
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace('Remote ICE candidate: \n ' + event.candidate.candidate);
   }
 }
 
+function onAddIceCandidateSuccess() {
+  trace('AddIceCandidate success.');
+}
+
+function onAddIceCandidateError(error) {
+  trace('Failed to add Ice Candidate: ' + error.toString());
+}
+
 function receiveChannelCallback(event) {
   trace('Receive Channel Callback');
   receiveChannel = event.channel;
diff --git a/samples/js/demos/html/device-switch.html b/samples/js/demos/html/device-switch.html
index e291fa9b02..ea6c36854f 100644
--- a/samples/js/demos/html/device-switch.html
+++ b/samples/js/demos/html/device-switch.html
@@ -185,17 +185,27 @@ function gotRemoteStream(e) {
 
 function iceCallback1(event) {
   if (event.candidate) {
-    pc2.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc2.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Local ICE candidate: \n" + event.candidate.candidate);
   }
 }
 
 function iceCallback2(event) {
   if (event.candidate) {
-    pc1.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc1.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Remote ICE candidate: \n " + event.candidate.candidate);
   }
 }
+
+function onAddIceCandidateSuccess() {
+  trace("AddIceCandidate success.");
+}
+
+function onAddIceCandidateError(error) {
+  trace("Failed to add Ice Candidate: " + error.toString());
+}
 </script>
 </body>
 </html>
diff --git a/samples/js/demos/html/dtmf1.html b/samples/js/demos/html/dtmf1.html
index de5c22a5cc..1e2abbe852 100644
--- a/samples/js/demos/html/dtmf1.html
+++ b/samples/js/demos/html/dtmf1.html
@@ -130,18 +130,28 @@ function gotRemoteStream(e){
 
 function iceCallback1(event){
   if (event.candidate) {
-    pc2.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc2.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Local ICE candidate: \n" + event.candidate.candidate);
   }
 }
       
 function iceCallback2(event){
   if (event.candidate) {
-    pc1.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc1.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Remote ICE candidate: \n " + event.candidate.candidate);
   }
 }
 
+function onAddIceCandidateSuccess() {
+  trace("AddIceCandidate success.");
+}
+
+function onAddIceCandidateError(error) {
+  trace("Failed to add Ice Candidate: " + error.toString());
+}
+
 function enableDtmfSender(){
   document.getElementById("dtmfTonesSent").value = "Dtmf activated\n";
   if (localstream != null) {
diff --git a/samples/js/demos/html/multiple.html b/samples/js/demos/html/multiple.html
index 2800d178a7..a4caf4832e 100644
--- a/samples/js/demos/html/multiple.html
+++ b/samples/js/demos/html/multiple.html
@@ -170,10 +170,19 @@ function iceCallback2Remote(event) {
 
 function handleCandidate(candidate, dest, prefix, type) {
   if (candidate) {
-    dest.addIceCandidate(new RTCIceCandidate(candidate));
+    dest.addIceCandidate(new RTCIceCandidate(candidate),
+                         onAddIceCandidateSuccess, onAddIceCandidateError);
     trace(prefix + "New " + type + " ICE candidate: " + candidate.candidate);
   }
 }
+
+function onAddIceCandidateSuccess() {
+  trace("AddIceCandidate success.");
+}
+
+function onAddIceCandidateError(error) {
+  trace("Failed to add Ice Candidate: " + error.toString());
+}
 </script>
 </body>
 </html>
diff --git a/samples/js/demos/html/pc1-audio.html b/samples/js/demos/html/pc1-audio.html
index 4273b62694..38c06676a6 100644
--- a/samples/js/demos/html/pc1-audio.html
+++ b/samples/js/demos/html/pc1-audio.html
@@ -95,17 +95,27 @@ function gotRemoteStream(e){
 
 function iceCallback1(event){
   if (event.candidate) {
-    pc2.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc2.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Local ICE candidate: \n" + event.candidate.candidate);
   }
 }
       
 function iceCallback2(event){
   if (event.candidate) {
-    pc1.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc1.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Remote ICE candidate: \n " + event.candidate.candidate);
   }
 }
+
+function onAddIceCandidateSuccess() {
+  trace("AddIceCandidate success.");
+}
+
+function onAddIceCandidateError(error) {
+  trace("Failed to add Ice Candidate: " + error.toString());
+}
 </script>
 </body>
 </html>
diff --git a/samples/js/demos/html/pc1.html b/samples/js/demos/html/pc1.html
index c3f3ced4b6..b82938d9f6 100644
--- a/samples/js/demos/html/pc1.html
+++ b/samples/js/demos/html/pc1.html
@@ -119,17 +119,27 @@ function gotRemoteStream(e){
 
 function iceCallback1(event){
   if (event.candidate) {
-    pc2.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc2.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Local ICE candidate: \n" + event.candidate.candidate);
   }
 }
       
 function iceCallback2(event){
   if (event.candidate) {
-    pc1.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc1.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Remote ICE candidate: \n " + event.candidate.candidate);
   }
 }
+
+function onAddIceCandidateSuccess() {
+  trace("AddIceCandidate success.");
+}
+
+function onAddIceCandidateError(error) {
+  trace("Failed to add Ice Candidate: " + error.toString());
+}
 </script>
 </body>
 </html>
diff --git a/samples/js/demos/html/pc1_sdp_munge.html b/samples/js/demos/html/pc1_sdp_munge.html
index 2c57ceeb5f..330e1ab19b 100644
--- a/samples/js/demos/html/pc1_sdp_munge.html
+++ b/samples/js/demos/html/pc1_sdp_munge.html
@@ -289,17 +289,27 @@ function gotRemoteStream(e) {
 
 function iceCallback1(event) {
   if (event.candidate) {
-    pc2.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc2.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Local ICE candidate: \n" + event.candidate.candidate);
   }
 }
 
 function iceCallback2(event) {
   if (event.candidate) {
-    pc1.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc1.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Remote ICE candidate: \n " + event.candidate.candidate);
   }
 }
+
+function onAddIceCandidateSuccess() {
+  trace("AddIceCandidate success.");
+}
+
+function onAddIceCandidateError(error) {
+  trace("Failed to add Ice Candidate: " + error.toString());
+}
 </script>
 </body>
 </html>
diff --git a/samples/js/demos/html/pranswer.html b/samples/js/demos/html/pranswer.html
index ed389da72f..be4d2da80d 100644
--- a/samples/js/demos/html/pranswer.html
+++ b/samples/js/demos/html/pranswer.html
@@ -122,17 +122,27 @@ function gotRemoteStream(e) {
 
 function iceCallback1(event) {
   if (event.candidate) {
-    pc2.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc2.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Local ICE candidate: \n" + event.candidate.candidate);
   }
 }
       
 function iceCallback2(event) {
   if (event.candidate) {
-    pc1.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc1.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Remote ICE candidate: \n " + event.candidate.candidate);
   }
 }
+
+function onAddIceCandidateSuccess() {
+  trace("AddIceCandidate success.");
+}
+
+function onAddIceCandidateError(error) {
+  trace("Failed to add Ice Candidate: " + error.toString());
+}
     </script>
   </body>
 </html>
diff --git a/samples/js/demos/html/states.html b/samples/js/demos/html/states.html
index 4a1c28ddf5..a89db07b2b 100644
--- a/samples/js/demos/html/states.html
+++ b/samples/js/demos/html/states.html
@@ -210,7 +210,8 @@ function iceStateCallback2() {
 
 function iceCallback1(event){
   if (event.candidate) {
-    pc2.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc2.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Local ICE candidate: \n" + event.candidate.candidate);
   } else {
     trace("end of candidates1");
@@ -219,12 +220,21 @@ function iceCallback1(event){
 
 function iceCallback2(event){
   if (event.candidate) {
-    pc1.addIceCandidate(new RTCIceCandidate(event.candidate));
+    pc1.addIceCandidate(new RTCIceCandidate(event.candidate),
+                        onAddIceCandidateSuccess, onAddIceCandidateError);
     trace("Remote ICE candidate: \n " + event.candidate.candidate);
   } else {
     trace("end of candidates2");
   }
 }
+
+function onAddIceCandidateSuccess() {
+  trace("AddIceCandidate success.");
+}
+
+function onAddIceCandidateError(error) {
+  trace("Failed to add Ice Candidate: " + error.toString());
+}
 </script>
 </body>
 </html>
diff --git a/samples/js/demos/html/webaudio-and-webrtc.html b/samples/js/demos/html/webaudio-and-webrtc.html
index 173a30845c..0438bcc313 100644
--- a/samples/js/demos/html/webaudio-and-webrtc.html
+++ b/samples/js/demos/html/webaudio-and-webrtc.html
@@ -174,18 +174,28 @@
 
   function iceCallback1(event){
     if (event.candidate) {
-      pc2.addIceCandidate(new RTCIceCandidate(event.candidate));
+      pc2.addIceCandidate(new RTCIceCandidate(event.candidate),
+                          onAddIceCandidateSuccess, onAddIceCandidateError);
       console.log('Local ICE candidate: \n' + event.candidate.candidate);
     }
   }
       
   function iceCallback2(event){
     if (event.candidate) {
-      pc1.addIceCandidate(new RTCIceCandidate(event.candidate));
+      pc1.addIceCandidate(new RTCIceCandidate(event.candidate),
+                          onAddIceCandidateSuccess, onAddIceCandidateError);
       console.log('Remote ICE candidate: \n ' + event.candidate.candidate);
     }
   }
-  
+
+  function onAddIceCandidateSuccess() {
+    trace("AddIceCandidate success.");
+  }
+
+  function onAddIceCandidateError(error) {
+    trace("Failed to add Ice Candidate: " + error.toString());
+  }
+
   function handleKeyDown(event) {
     var keyCode = event.keyCode;
     webAudio.addEffect();