diff --git a/linphone-app/src/components/assistant/AssistantModel.cpp b/linphone-app/src/components/assistant/AssistantModel.cpp
index fb7051403..57762ee7e 100644
--- a/linphone-app/src/components/assistant/AssistantModel.cpp
+++ b/linphone-app/src/components/assistant/AssistantModel.cpp
@@ -365,7 +365,7 @@ void AssistantModel::setPhoneNumber (const QString &phoneNumber) {
 // -----------------------------------------------------------------------------
 
 QString AssistantModel::getUsername () const {
-  return Utils::coreStringToAppString(mAccountCreator->getUsername());
+  return QString::fromStdString(mAccountCreator->getUsername());
 }
 
 void AssistantModel::setUsername (const QString &username) {
diff --git a/linphone-app/src/components/authentication/AuthenticationNotifier.cpp b/linphone-app/src/components/authentication/AuthenticationNotifier.cpp
index 858bb9ae9..fe3f496c0 100644
--- a/linphone-app/src/components/authentication/AuthenticationNotifier.cpp
+++ b/linphone-app/src/components/authentication/AuthenticationNotifier.cpp
@@ -40,7 +40,7 @@ void AuthenticationNotifier::handleAuthenticationRequested (const shared_ptr<lin
     QVariant::fromValue(authInfo),
     Utils::coreStringToAppString(authInfo->getRealm()),
     QStringLiteral("%1@%2").arg(
-      Utils::coreStringToAppString(authInfo->getUsername())
+      QString::fromStdString(authInfo->getUsername())
     ).arg(
       Utils::coreStringToAppString(authInfo->getDomain())
     ),
diff --git a/linphone-app/src/components/call/CallModel.cpp b/linphone-app/src/components/call/CallModel.cpp
index 5c058c7fc..1908c392e 100644
--- a/linphone-app/src/components/call/CallModel.cpp
+++ b/linphone-app/src/components/call/CallModel.cpp
@@ -112,7 +112,7 @@ void CallModel::setRecordFile (const shared_ptr<linphone::CallParams> &callParam
 
 void CallModel::setRecordFile (const shared_ptr<linphone::CallParams> &callParams, const QString &to) {
   const QString from(
-    Utils::coreStringToAppString(
+    QString::fromStdString(
       CoreManager::getInstance()->getAccountSettingsModel()->getUsedSipAddress()->getUsername()
     )
   );
@@ -779,8 +779,8 @@ QString CallModel::iceStateToString (linphone::IceState state) const {
 QString CallModel::generateSavedFilename () const {
   const shared_ptr<linphone::CallLog> callLog(mCall->getCallLog());
   return generateSavedFilename(
-    Utils::coreStringToAppString(callLog->getFromAddress()->getUsername()),
-    Utils::coreStringToAppString(callLog->getToAddress()->getUsername())
+    QString::fromStdString(callLog->getFromAddress()->getUsername()),
+    QString::fromStdString(callLog->getToAddress()->getUsername())
   );
 }
 
diff --git a/linphone-app/src/components/calls/CallsListModel.cpp b/linphone-app/src/components/calls/CallsListModel.cpp
index d4f9e2bdc..21600aa46 100644
--- a/linphone-app/src/components/calls/CallsListModel.cpp
+++ b/linphone-app/src/components/calls/CallsListModel.cpp
@@ -112,8 +112,24 @@ void CallsListModel::launchAudioCall (const QString &sipAddress, const QHash<QSt
     params->addCustomHeader(Utils::appStringToCoreString(iterator.key()), Utils::appStringToCoreString(iterator.value()));
   }
   params->setProxyConfig(core->getDefaultProxyConfig());
-  CallModel::setRecordFile(params, Utils::coreStringToAppString(address->getUsername()));
-  core->inviteAddressWithParams(address, params);
+  CallModel::setRecordFile(params, QString::fromStdString(address->getUsername()));
+  shared_ptr<linphone::ProxyConfig> currentProxyConfig = core->getDefaultProxyConfig();
+  if(currentProxyConfig){
+    if(currentProxyConfig->getState() == linphone::RegistrationState::Ok)
+      core->inviteAddressWithParams(address, params);
+    else{
+            QObject * context = new QObject();
+            QObject::connect(CoreManager::getInstance()->getHandlers().get(), &CoreHandlers::registrationStateChanged,context,
+            [address,core,params,currentProxyConfig, context](const std::shared_ptr<linphone::ProxyConfig> &proxyConfig, linphone::RegistrationState state) mutable {
+              if(context && proxyConfig==currentProxyConfig && state==linphone::RegistrationState::Ok){
+                delete context;
+                context = nullptr;
+                core->inviteAddressWithParams(address, params);
+              }
+            });
+    }
+  }else
+    core->inviteAddressWithParams(address, params);
 }
 
 void CallsListModel::launchVideoCall (const QString &sipAddress) const {
@@ -131,7 +147,7 @@ void CallsListModel::launchVideoCall (const QString &sipAddress) const {
   shared_ptr<linphone::CallParams> params = core->createCallParams(nullptr);
   params->enableVideo(true);
   params->setProxyConfig(core->getDefaultProxyConfig());
-  CallModel::setRecordFile(params, Utils::coreStringToAppString(address->getUsername()));
+  CallModel::setRecordFile(params, QString::fromStdString(address->getUsername()));
   core->inviteAddressWithParams(address, params);
 }
 
diff --git a/linphone-app/src/components/settings/AccountSettingsModel.cpp b/linphone-app/src/components/settings/AccountSettingsModel.cpp
index c807ab87a..55da05b47 100644
--- a/linphone-app/src/components/settings/AccountSettingsModel.cpp
+++ b/linphone-app/src/components/settings/AccountSettingsModel.cpp
@@ -356,7 +356,7 @@ AccountSettingsModel::RegistrationState AccountSettingsModel::getRegistrationSta
 // -----------------------------------------------------------------------------
 
 QString AccountSettingsModel::getPrimaryUsername () const {
-  return Utils::coreStringToAppString(
+  return QString::fromStdString(
     CoreManager::getInstance()->getCore()->createPrimaryContactParsed()->getUsername()
   );
 }
diff --git a/linphone-app/ui/scripts/LinphoneUtils/linphone-utils.js b/linphone-app/ui/scripts/LinphoneUtils/linphone-utils.js
index 3c16a6ac3..1281a6364 100644
--- a/linphone-app/ui/scripts/LinphoneUtils/linphone-utils.js
+++ b/linphone-app/ui/scripts/LinphoneUtils/linphone-utils.js
@@ -74,10 +74,10 @@ function _getUsername (str) {
 
   var end = str.indexOf('@', start + 1)
   if (end === -1) {
-    return str.substring(start)
+    return Utils.decode(str.substring(start))
   }
 
-  return str.substring(start, end)
+  return Utils.decode(str.substring(start, end))
 }
 
 // -----------------------------------------------------------------------------
diff --git a/linphone-app/ui/scripts/Utils/utils.js b/linphone-app/ui/scripts/Utils/utils.js
index 95644d052..f82a23da4 100644
--- a/linphone-app/ui/scripts/Utils/utils.js
+++ b/linphone-app/ui/scripts/Utils/utils.js
@@ -449,6 +449,11 @@ function escapeQuotes (str) {
     : ''
 }
 
+function decode(str){
+  return decodeURIComponent(escape(str.replace(/%([0-9A-Fa-f]{2})/g, function() {
+    return String.fromCharCode(parseInt(arguments[1], 16));
+  })));
+}
 // -----------------------------------------------------------------------------
 
 // Get the first matching value in a array or object.