diff --git a/src/main/java/eu/siacs/conversations/ui/RtpSessionActivity.java b/src/main/java/eu/siacs/conversations/ui/RtpSessionActivity.java
index 1aef98afc9d26344c40d0c961393ea2eb208ad54..7c4024fe0bb4430227716715889667a17c9e9cef 100644
--- a/src/main/java/eu/siacs/conversations/ui/RtpSessionActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/RtpSessionActivity.java
@@ -1,6 +1,7 @@
 package eu.siacs.conversations.ui;
 
 import android.content.Intent;
+import android.content.res.ColorStateList;
 import android.databinding.DataBindingUtil;
 import android.os.Bundle;
 import android.util.Log;
@@ -47,9 +48,6 @@ public class RtpSessionActivity extends XmppActivity implements XmppConnectionSe
         ;
         Log.d(Config.LOGTAG, "RtpSessionActivity.onCreate()");
         this.binding = DataBindingUtil.setContentView(this, R.layout.activity_rtp_session);
-        this.binding.rejectCall.setOnClickListener(this::rejectCall);
-        this.binding.endCall.setOnClickListener(this::endCall);
-        this.binding.acceptCall.setOnClickListener(this::acceptCall);
     }
 
     @Override
@@ -166,14 +164,20 @@ public class RtpSessionActivity extends XmppActivity implements XmppConnectionSe
                 break;
             case DECLINED_OR_BUSY:
                 binding.status.setText(R.string.rtp_state_declined_or_busy);
+            case CONNECTIVITY_ERROR:
+                binding.status.setText(R.string.rtp_state_connectivity_error);
                 break;
         }
     }
 
     private void updateButtonConfiguration(final RtpEndUserState state) {
         if (state == RtpEndUserState.INCOMING_CALL) {
+            this.binding.rejectCall.setOnClickListener(this::rejectCall);
+            this.binding.rejectCall.setImageResource(R.drawable.ic_call_end_white_48dp);
             this.binding.rejectCall.show();
             this.binding.endCall.hide();
+            this.binding.acceptCall.setOnClickListener(this::acceptCall);
+            this.binding.acceptCall.setImageResource(R.drawable.ic_call_white_48dp);
             this.binding.acceptCall.show();
         } else if (state == RtpEndUserState.ENDING_CALL) {
             this.binding.rejectCall.hide();
@@ -181,19 +185,31 @@ public class RtpSessionActivity extends XmppActivity implements XmppConnectionSe
             this.binding.acceptCall.hide();
         } else if (state == RtpEndUserState.DECLINED_OR_BUSY) {
             this.binding.rejectCall.hide();
+            this.binding.endCall.setOnClickListener(this::exit);
             this.binding.endCall.setImageResource(R.drawable.ic_clear_white_48dp);
             this.binding.endCall.show();
-            this.binding.endCall.setOnClickListener(this::exit);
             this.binding.acceptCall.hide();
+        } else if (state == RtpEndUserState.CONNECTIVITY_ERROR) {
+            this.binding.rejectCall.setOnClickListener(this::exit);
+            this.binding.rejectCall.setImageResource(R.drawable.ic_clear_white_48dp);
+            this.binding.rejectCall.show();
+            this.binding.endCall.hide();
+            this.binding.acceptCall.setOnClickListener(this::retry);
+            this.binding.acceptCall.setImageResource(R.drawable.ic_replay_white_48dp);
+            this.binding.acceptCall.show();
         } else {
             this.binding.rejectCall.hide();
+            this.binding.endCall.setOnClickListener(this::endCall);
             this.binding.endCall.setImageResource(R.drawable.ic_call_end_white_48dp);
             this.binding.endCall.show();
-            this.binding.endCall.setOnClickListener(this::endCall);
             this.binding.acceptCall.hide();
         }
     }
 
+    private void retry(View view) {
+
+    }
+
     private void exit(View view) {
         finish();
     }
diff --git a/src/main/java/eu/siacs/conversations/xmpp/jingle/WebRTCWrapper.java b/src/main/java/eu/siacs/conversations/xmpp/jingle/WebRTCWrapper.java
index f7d79771e5d6c197d423903d857fa4deaac62716..f8e7947b772ae93642f593f277a1a48bb00d1b3c 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/jingle/WebRTCWrapper.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/jingle/WebRTCWrapper.java
@@ -14,6 +14,7 @@ import org.webrtc.AudioTrack;
 import org.webrtc.Camera1Capturer;
 import org.webrtc.Camera1Enumerator;
 import org.webrtc.CameraVideoCapturer;
+import org.webrtc.CandidatePairChangeEvent;
 import org.webrtc.DataChannel;
 import org.webrtc.IceCandidate;
 import org.webrtc.MediaConstraints;
@@ -58,6 +59,12 @@ public class WebRTCWrapper {
 
         }
 
+        @Override
+        public void onSelectedCandidatePairChanged(CandidatePairChangeEvent event) {
+            Log.d(Config.LOGTAG, "remote candidate selected: " + event.remote);
+            Log.d(Config.LOGTAG, "local candidate selected: " + event.local);
+        }
+
         @Override
         public void onIceConnectionReceivingChange(boolean b) {
 
diff --git a/src/main/res/drawable-hdpi/ic_replay_white_48dp.png b/src/main/res/drawable-hdpi/ic_replay_white_48dp.png
new file mode 100644
index 0000000000000000000000000000000000000000..fcddcf02ddb58ee1680889e7315757d76419b4b2
Binary files /dev/null and b/src/main/res/drawable-hdpi/ic_replay_white_48dp.png differ
diff --git a/src/main/res/drawable-mdpi/ic_replay_white_48dp.png b/src/main/res/drawable-mdpi/ic_replay_white_48dp.png
new file mode 100644
index 0000000000000000000000000000000000000000..3b41913257dbe14e552f8203ba4612c9e49fa7a7
Binary files /dev/null and b/src/main/res/drawable-mdpi/ic_replay_white_48dp.png differ
diff --git a/src/main/res/drawable-xhdpi/ic_replay_white_48dp.png b/src/main/res/drawable-xhdpi/ic_replay_white_48dp.png
new file mode 100644
index 0000000000000000000000000000000000000000..1573fb111b535e5e0df9371ff7f804ce2c40a0fa
Binary files /dev/null and b/src/main/res/drawable-xhdpi/ic_replay_white_48dp.png differ
diff --git a/src/main/res/drawable-xxhdpi/ic_replay_white_48dp.png b/src/main/res/drawable-xxhdpi/ic_replay_white_48dp.png
new file mode 100644
index 0000000000000000000000000000000000000000..5105c2251b72ccf4968f659b10e98200b6a21acd
Binary files /dev/null and b/src/main/res/drawable-xxhdpi/ic_replay_white_48dp.png differ
diff --git a/src/main/res/drawable-xxxhdpi/ic_replay_white_48dp.png b/src/main/res/drawable-xxxhdpi/ic_replay_white_48dp.png
new file mode 100644
index 0000000000000000000000000000000000000000..04cbde9af1926410c77e666492a8c5407d938f2b
Binary files /dev/null and b/src/main/res/drawable-xxxhdpi/ic_replay_white_48dp.png differ
diff --git a/src/main/res/values/strings.xml b/src/main/res/values/strings.xml
index 0a1d6f78c703f1341861bb11d19168230fb6e736..487ee434ba5c32ec45b13a6f252c58c9dbf95528 100644
--- a/src/main/res/values/strings.xml
+++ b/src/main/res/values/strings.xml
@@ -897,6 +897,7 @@
     <string name="rtp_state_finding_device">Locating devices</string>
     <string name="rtp_state_ringing">Ringing</string>
     <string name="rtp_state_declined_or_busy">Busy</string>
+    <string name="rtp_state_connectivity_error">Unable to connect call</string>
     <plurals name="view_users">
         <item quantity="one">View %1$d Participant</item>
         <item quantity="other">View %1$d Participants</item>