diff --git a/res/values-FR/strings.xml b/res/values-FR/strings.xml
index c46277740..592f64ae7 100644
--- a/res/values-FR/strings.xml
+++ b/res/values-FR/strings.xml
@@ -364,6 +364,7 @@
 	<string name="error_user_not_found">Utilisateur non trouvé</string>
 	<string name="error_incompatible_media">Paramètres média incompatibles</string>
 	<string name="error_low_bandwidth">Votre correspondant à un débit faible, la vidéo ne peut démarrer</string>
+	<string name="error_network_unreachable">Le réseau n\'est pas joignable</string>
 	
 	<string name="today">Aujourd\'hui</string>
 	<string name="yesterday">Hier</string>
diff --git a/res/values/strings.xml b/res/values/strings.xml
index ed2aea972..7a16ad8eb 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -411,6 +411,7 @@
 	<string name="error_user_not_found">User not found</string>
 	<string name="error_incompatible_media">Incompatible media parameters</string>
 	<string name="error_low_bandwidth">Your correspondent has low bandwidth, video can\'t be started</string>
+	<string name="error_network_unreachable">Network is unreachable</string>
 	
 	<string name="today">Today</string>
 	<string name="yesterday">Yesterday</string>
diff --git a/src/org/linphone/ChatFragment.java b/src/org/linphone/ChatFragment.java
index cccc0b383..a54fde846 100644
--- a/src/org/linphone/ChatFragment.java
+++ b/src/org/linphone/ChatFragment.java
@@ -458,7 +458,10 @@ public class ChatFragment extends Fragment implements OnClickListener, LinphoneC
 	}
 	
 	private void sendTextMessage() {
-		if (chatRoom != null && message != null && message.getText().length() > 0) {
+		LinphoneCore lc = LinphoneManager.getLcIfManagerNotDestroyedOrNull();
+		boolean isNetworkReachable = lc == null ? false : lc.isNetworkReachable();
+		
+		if (chatRoom != null && message != null && message.getText().length() > 0 && isNetworkReachable) {
 			String messageToSend = message.getText().toString();
 			message.setText("");
 
@@ -472,11 +475,16 @@ public class ChatFragment extends Fragment implements OnClickListener, LinphoneC
 			
 			displayMessage(newId, messageToSend, String.valueOf(System.currentTimeMillis()), false, State.InProgress, messagesLayout);
 			scrollToEnd();
+		} else if (!isNetworkReachable && LinphoneActivity.isInstanciated()) {
+			LinphoneActivity.instance().displayCustomToast(getString(R.string.error_network_unreachable), Toast.LENGTH_LONG);
 		}
 	}
 	
 	private void sendImageMessage(String url, Bitmap bitmap) {
-		if (chatRoom != null && url != null && url.length() > 0) {
+		LinphoneCore lc = LinphoneManager.getLcIfManagerNotDestroyedOrNull();
+		boolean isNetworkReachable = lc == null ? false : lc.isNetworkReachable();
+		
+		if (chatRoom != null && url != null && url.length() > 0 && isNetworkReachable) {
 			LinphoneChatMessage chatMessage = chatRoom.createLinphoneChatMessage("");
 			chatMessage.setExternalBodyUrl(url);
 			chatRoom.sendMessage(chatMessage, this);
@@ -489,6 +497,8 @@ public class ChatFragment extends Fragment implements OnClickListener, LinphoneC
 			
 			displayImageMessage(newId, bitmap, String.valueOf(System.currentTimeMillis()), false, State.InProgress, messagesLayout);
 			scrollToEnd();
+		} else if (!isNetworkReachable && LinphoneActivity.isInstanciated()) {
+			LinphoneActivity.instance().displayCustomToast(getString(R.string.error_network_unreachable), Toast.LENGTH_LONG);
 		}
 	}
 	
diff --git a/src/org/linphone/LinphoneManager.java b/src/org/linphone/LinphoneManager.java
index 15a03b398..86858044b 100644
--- a/src/org/linphone/LinphoneManager.java
+++ b/src/org/linphone/LinphoneManager.java
@@ -107,6 +107,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.view.Window;
 import android.view.WindowManager;
+import android.widget.Toast;
 
 /**
  * 
@@ -277,20 +278,26 @@ public final class LinphoneManager implements LinphoneCoreListener {
 
 		boolean isLowBandwidthConnection = !LinphoneUtils.isHightBandwidthConnection(LinphoneService.instance().getApplicationContext());
 		
-		try {
-			if (Version.isVideoCapable()) {
-				boolean prefVideoEnable = isVideoEnabled();
-				int key = R.string.pref_video_initiate_call_with_video_key;
-				boolean prefInitiateWithVideo = getPrefBoolean(key, false);
-				CallManager.getInstance().inviteAddress(lAddress, prefVideoEnable && prefInitiateWithVideo, isLowBandwidthConnection);
-			} else {
-				CallManager.getInstance().inviteAddress(lAddress, false, isLowBandwidthConnection);
+		if (mLc.isNetworkReachable()) {
+			try {
+				if (Version.isVideoCapable()) {
+					boolean prefVideoEnable = isVideoEnabled();
+					int key = R.string.pref_video_initiate_call_with_video_key;
+					boolean prefInitiateWithVideo = getPrefBoolean(key, false);
+					CallManager.getInstance().inviteAddress(lAddress, prefVideoEnable && prefInitiateWithVideo, isLowBandwidthConnection);
+				} else {
+					CallManager.getInstance().inviteAddress(lAddress, false, isLowBandwidthConnection);
+				}
+				
+	
+			} catch (LinphoneCoreException e) {
+				mListenerDispatcher.tryingNewOutgoingCallButCannotGetCallParameters();
+				return;
 			}
-			
-
-		} catch (LinphoneCoreException e) {
-			mListenerDispatcher.tryingNewOutgoingCallButCannotGetCallParameters();
-			return;
+		} else if (LinphoneActivity.isInstanciated()) {
+			LinphoneActivity.instance().displayCustomToast(getString(R.string.error_network_unreachable), Toast.LENGTH_LONG);
+		} else {
+			Log.e("Error: " + getString(R.string.error_network_unreachable));
 		}
 	}