diff --git a/linphone-app/src/components/assistant/AssistantModel.cpp b/linphone-app/src/components/assistant/AssistantModel.cpp
index fb7051403..7005e62c1 100644
--- a/linphone-app/src/components/assistant/AssistantModel.cpp
+++ b/linphone-app/src/components/assistant/AssistantModel.cpp
@@ -226,19 +226,19 @@ bool AssistantModel::addOtherSipAccount (const QVariantMap &map) {
 
     if (proxyConfig->setServerAddr(address->asString())) {
       qWarning() << QStringLiteral("Unable to add server address: `%1`.")
-        .arg(Utils::coreStringToAppString(address->asString()));
+        .arg(QString::fromStdString(address->asString()));
       return false;
     }
   }
 
   // Sip Address.
-  shared_ptr<linphone::Address> address = factory->createAddress(Utils::appStringToCoreString(sipAddress));
+  shared_ptr<linphone::Address> address = factory->createAddress(sipAddress.toStdString());
   if (!address) {
     qWarning() << QStringLiteral("Unable to create sip address object from: `%1`.").arg(sipAddress);
     return false;
   }
 
-  address->setDisplayName(Utils::appStringToCoreString(map["displayName"].toString()));
+  address->setDisplayName(map["displayName"].toString().toStdString());
   proxyConfig->setIdentityAddress(address);
 
   // AuthInfo.
@@ -380,14 +380,14 @@ void AssistantModel::setUsername (const QString &username) {
 // -----------------------------------------------------------------------------
 
 QString AssistantModel::getDisplayName () const {
-  return Utils::coreStringToAppString(mAccountCreator->getDisplayName());
+  return QString::fromStdString(mAccountCreator->getDisplayName());
 }
 
 void AssistantModel::setDisplayName (const QString &displayName) {
   emit displayNameChanged(
     displayName,
     mapAccountCreatorUsernameStatusToString(
-      mAccountCreator->setDisplayName(Utils::appStringToCoreString(displayName))
+      mAccountCreator->setDisplayName(displayName.toStdString())
     )
   );
 }
diff --git a/linphone-app/src/components/call/CallModel.cpp b/linphone-app/src/components/call/CallModel.cpp
index 5c058c7fc..c1aadc1aa 100644
--- a/linphone-app/src/components/call/CallModel.cpp
+++ b/linphone-app/src/components/call/CallModel.cpp
@@ -94,11 +94,11 @@ QString CallModel::getLocalAddress () const {
   return Utils::coreStringToAppString(mCall->getCallLog()->getLocalAddress()->asStringUriOnly());
 }
 QString CallModel::getFullPeerAddress () const {
-  return Utils::coreStringToAppString(mCall->getRemoteAddress()->asString());
+  return QString::fromStdString(mCall->getRemoteAddress()->asString());
 }
 
 QString CallModel::getFullLocalAddress () const {
-  return Utils::coreStringToAppString(mCall->getCallLog()->getLocalAddress()->asString());
+  return QString::fromStdString(mCall->getCallLog()->getLocalAddress()->asString());
 }
 // -----------------------------------------------------------------------------
 
diff --git a/linphone-app/src/components/chat/ChatModel.cpp b/linphone-app/src/components/chat/ChatModel.cpp
index 89b43b022..478a665bb 100644
--- a/linphone-app/src/components/chat/ChatModel.cpp
+++ b/linphone-app/src/components/chat/ChatModel.cpp
@@ -407,23 +407,19 @@ QString ChatModel::getLocalAddress () const {
   );
 }
 QString ChatModel::getFullPeerAddress () const {
-  return Utils::coreStringToAppString(
-    mChatRoom->getPeerAddress()->asString()
-  );
+  return QString::fromStdString(mChatRoom->getPeerAddress()->asString());
 }
 
 QString ChatModel::getFullLocalAddress () const {
-  return Utils::coreStringToAppString(
-    mChatRoom->getLocalAddress()->asString()
-  );
+  return QString::fromStdString(mChatRoom->getLocalAddress()->asString());
 }
 void ChatModel::setSipAddresses (const QString &peerAddress, const QString &localAddress) {
   shared_ptr<linphone::Core> core = CoreManager::getInstance()->getCore();
   shared_ptr<linphone::Factory> factory(linphone::Factory::get());
   
   mChatRoom = core->getChatRoom(
-    factory->createAddress(Utils::appStringToCoreString(peerAddress)),
-    factory->createAddress(Utils::appStringToCoreString(localAddress))
+    factory->createAddress(peerAddress.toStdString()),
+    factory->createAddress(localAddress.toStdString())
   );
   Q_ASSERT(mChatRoom);
 
diff --git a/linphone-app/src/components/core/CoreManager.cpp b/linphone-app/src/components/core/CoreManager.cpp
index 7927783b8..25307bd00 100644
--- a/linphone-app/src/components/core/CoreManager.cpp
+++ b/linphone-app/src/components/core/CoreManager.cpp
@@ -116,8 +116,8 @@ shared_ptr<ChatModel> CoreManager::getChatModel (const QString &peerAddress, con
   QPair<QString, QString> chatModelId{ peerAddress, localAddress };
   if (!mChatModels.contains(chatModelId)) {
     if (
-      !mCore->createAddress(Utils::appStringToCoreString(peerAddress)) ||
-      !mCore->createAddress(Utils::appStringToCoreString(localAddress))
+      !mCore->createAddress(peerAddress.toStdString()) ||
+      !mCore->createAddress(localAddress.toStdString())
     ) {
       qWarning() << QStringLiteral("Unable to get chat model from invalid chat model id: (%1, %2).")
         .arg(peerAddress).arg(localAddress);
diff --git a/linphone-app/src/components/history/HistoryModel.cpp b/linphone-app/src/components/history/HistoryModel.cpp
index 6c341f7cb..2e506cf3d 100644
--- a/linphone-app/src/components/history/HistoryModel.cpp
+++ b/linphone-app/src/components/history/HistoryModel.cpp
@@ -53,7 +53,7 @@ static inline void fillCallStartEntry (QVariantMap &dest, const shared_ptr<linph
 	dest["isOutgoing"] = callLog->getDir() == linphone::Call::Dir::Outgoing;
 	dest["status"] = static_cast<HistoryModel::CallStatus>(callLog->getStatus());
 	dest["isStart"] = true;
-	dest["sipAddress"] = Utils::coreStringToAppString(callLog->getRemoteAddress()->asString());
+	dest["sipAddress"] = QString::fromStdString(callLog->getRemoteAddress()->asString());
 }
 
 static inline void fillCallEndEntry (QVariantMap &dest, const shared_ptr<linphone::CallLog> &callLog) {
@@ -62,7 +62,7 @@ static inline void fillCallEndEntry (QVariantMap &dest, const shared_ptr<linphon
 	dest["isOutgoing"] = callLog->getDir() == linphone::Call::Dir::Outgoing;
 	dest["status"] = static_cast<HistoryModel::CallStatus>(callLog->getStatus());
 	dest["isStart"] = false;
-	dest["sipAddress"] = Utils::coreStringToAppString(callLog->getRemoteAddress()->asString());
+	dest["sipAddress"] = QString::fromStdString(callLog->getRemoteAddress()->asString());
 }
 
 // -----------------------------------------------------------------------------
diff --git a/linphone-app/src/components/notifier/Notifier.cpp b/linphone-app/src/components/notifier/Notifier.cpp
index de5eb692b..3537c22b9 100644
--- a/linphone-app/src/components/notifier/Notifier.cpp
+++ b/linphone-app/src/components/notifier/Notifier.cpp
@@ -275,8 +275,8 @@ void Notifier::notifyReceivedMessage (const shared_ptr<linphone::ChatMessage> &m
   shared_ptr<linphone::ChatRoom> chatRoom(message->getChatRoom());
   map["peerAddress"] = Utils::coreStringToAppString(chatRoom->getPeerAddress()->asStringUriOnly());
   map["localAddress"] = Utils::coreStringToAppString(chatRoom->getLocalAddress()->asStringUriOnly());
-  map["fullPeerAddress"] = Utils::coreStringToAppString(chatRoom->getPeerAddress()->asString());
-  map["fullLocalAddress"] = Utils::coreStringToAppString(chatRoom->getLocalAddress()->asString());
+  map["fullPeerAddress"] = QString::fromStdString(chatRoom->getPeerAddress()->asString());
+  map["fullLocalAddress"] = QString::fromStdString(chatRoom->getLocalAddress()->asString());
   map["window"].setValue(App::getInstance()->getMainWindow());
   CREATE_NOTIFICATION(Notifier::ReceivedMessage, map)
 }
diff --git a/linphone-app/src/components/settings/AccountSettingsModel.cpp b/linphone-app/src/components/settings/AccountSettingsModel.cpp
index c807ab87a..fd00664f4 100644
--- a/linphone-app/src/components/settings/AccountSettingsModel.cpp
+++ b/linphone-app/src/components/settings/AccountSettingsModel.cpp
@@ -84,7 +84,7 @@ QString AccountSettingsModel::getUsedSipAddressAsStringUriOnly () const {
 }
 
 QString AccountSettingsModel::getUsedSipAddressAsString () const {
-	return Utils::coreStringToAppString(getUsedSipAddress()->asString());
+	return QString::fromStdString(getUsedSipAddress()->asString());
 }
 // -----------------------------------------------------------------------------
 
@@ -98,14 +98,14 @@ bool AccountSettingsModel::addOrUpdateProxyConfig (const shared_ptr<linphone::Pr
   if (find(proxyConfigs.cbegin(), proxyConfigs.cend(), proxyConfig) != proxyConfigs.cend()) {
     if (proxyConfig->done() == -1) {
       qWarning() << QStringLiteral("Unable to update proxy config: `%1`.")
-        .arg(Utils::coreStringToAppString(proxyConfig->getIdentityAddress()->asString()));
+        .arg(QString::fromStdString(proxyConfig->getIdentityAddress()->asString()));
       return false;
     }
     coreManager->getSettingsModel()->configureRlsUri();
   } else {
     if (core->addProxyConfig(proxyConfig) == -1) {
       qWarning() << QStringLiteral("Unable to add proxy config: `%1`.")
-        .arg(Utils::coreStringToAppString(proxyConfig->getIdentityAddress()->asString()));
+        .arg(QString::fromStdString(proxyConfig->getIdentityAddress()->asString()));
       return false;
     }
     coreManager->getSettingsModel()->configureRlsUri(proxyConfig);
@@ -123,7 +123,7 @@ QVariantMap AccountSettingsModel::getProxyConfigDescription (const shared_ptr<li
   {
     const shared_ptr<const linphone::Address> address = proxyConfig->getIdentityAddress();
     map["sipAddress"] = address
-	  ? Utils::coreStringToAppString(proxyConfig->getIdentityAddress()->asString())
+	  ? QString::fromStdString(proxyConfig->getIdentityAddress()->asString())
       : QString("");
   }
   map["serverAddress"] = Utils::coreStringToAppString(proxyConfig->getServerAddr());
@@ -220,9 +220,7 @@ bool AccountSettingsModel::addOrUpdateProxyConfig (
 
   // Sip address.
   {
-    shared_ptr<linphone::Address> address = linphone::Factory::get()->createAddress(
-      Utils::appStringToCoreString(literal)
-    );
+      shared_ptr<linphone::Address> address = linphone::Factory::get()->createAddress(literal.toStdString());
     if (!address) {
       qWarning() << QStringLiteral("Unable to create sip address object from: `%1`.").arg(literal);
       return false;
@@ -329,7 +327,7 @@ QString AccountSettingsModel::getUsername () const {
   shared_ptr<const linphone::Address> address = getUsedSipAddress();
   const string displayName = address->getDisplayName();
 
-  return Utils::coreStringToAppString(
+  return QString::fromStdString(
     displayName.empty() ? address->getUsername() : displayName
   );
 }
@@ -338,7 +336,7 @@ void AccountSettingsModel::setUsername (const QString &username) {
   shared_ptr<const linphone::Address> address = getUsedSipAddress();
   shared_ptr<linphone::Address> newAddress = address->clone();
 
-  if (newAddress->setDisplayName(Utils::appStringToCoreString(username))) {
+  if (newAddress->setDisplayName(username.toStdString())) {
     qWarning() << QStringLiteral("Unable to set displayName on sip address: `%1`.")
       .arg(Utils::coreStringToAppString(newAddress->asStringUriOnly()));
   } else {
@@ -374,23 +372,21 @@ void AccountSettingsModel::setPrimaryUsername (const QString &username) {
 }
 
 QString AccountSettingsModel::getPrimaryDisplayName () const {
-  return Utils::coreStringToAppString(
-    CoreManager::getInstance()->getCore()->createPrimaryContactParsed()->getDisplayName()
-  );
+  return QString::fromStdString(CoreManager::getInstance()->getCore()->createPrimaryContactParsed()->getDisplayName());
 }
 
 void AccountSettingsModel::setPrimaryDisplayName (const QString &displayName) {
   shared_ptr<linphone::Core> core = CoreManager::getInstance()->getCore();
   shared_ptr<linphone::Address> primary = core->createPrimaryContactParsed();
 
-  primary->setDisplayName(Utils::appStringToCoreString(displayName));
+  primary->setDisplayName(displayName.toStdString());
   core->setPrimaryContact(primary->asString());
 
   emit accountSettingsUpdated();
 }
 
 QString AccountSettingsModel::getPrimarySipAddress () const {
-  return Utils::coreStringToAppString(
+  return QString::fromStdString(
     CoreManager::getInstance()->getCore()->createPrimaryContactParsed()->asString()
   );
 }
@@ -404,7 +400,7 @@ QVariantList AccountSettingsModel::getAccounts () const {
   {
     QVariantMap account;
     account["sipAddress"] = Utils::coreStringToAppString(core->createPrimaryContactParsed()->asStringUriOnly());
-    account["fullSipAddress"] = Utils::coreStringToAppString(core->createPrimaryContactParsed()->asString());
+    account["fullSipAddress"] = QString::fromStdString(core->createPrimaryContactParsed()->asString());
     account["unreadMessageCount"] = core->getUnreadChatMessageCountFromLocal(core->createPrimaryContactParsed());
     account["missedCallCount"] = CoreManager::getInstance()->getMissedCallCountFromLocal(account["sipAddress"].toString());
     account["proxyConfig"].setValue(nullptr);
@@ -414,7 +410,7 @@ QVariantList AccountSettingsModel::getAccounts () const {
   for (const auto &proxyConfig : core->getProxyConfigList()) {
     QVariantMap account;
     account["sipAddress"] = Utils::coreStringToAppString(proxyConfig->getIdentityAddress()->asStringUriOnly());
-    account["fullSipAddress"] = Utils::coreStringToAppString(proxyConfig->getIdentityAddress()->asString());
+    account["fullSipAddress"] = QString::fromStdString(proxyConfig->getIdentityAddress()->asString());
     account["proxyConfig"].setValue(proxyConfig);
     account["unreadMessageCount"] = proxyConfig->getUnreadChatMessageCount();
     account["missedCallCount"] = CoreManager::getInstance()->getMissedCallCountFromLocal(account["sipAddress"].toString());
diff --git a/linphone-app/src/components/sip-addresses/SipAddressesModel.cpp b/linphone-app/src/components/sip-addresses/SipAddressesModel.cpp
index 4de3697ac..31cb49424 100644
--- a/linphone-app/src/components/sip-addresses/SipAddressesModel.cpp
+++ b/linphone-app/src/components/sip-addresses/SipAddressesModel.cpp
@@ -155,10 +155,7 @@ SipAddressObserver *SipAddressesModel::getSipAddressObserver (const QString &pee
 QString SipAddressesModel::getTransportFromSipAddress (const QString &sipAddress) {
     if( sipAddress.toUpper().contains("TRANSPORT="))
     {// Transport has been specified : check for it
-      const shared_ptr<const linphone::Address> address = linphone::Factory::get()->createAddress(
-        Utils::appStringToCoreString(sipAddress)
-      );
-
+      const shared_ptr<const linphone::Address> address = linphone::Factory::get()->createAddress(sipAddress.toStdString());
       if (!address)
         return QString("TLS");  // Return TLS by default
 
@@ -178,16 +175,14 @@ QString SipAddressesModel::getTransportFromSipAddress (const QString &sipAddress
 }
 
 QString SipAddressesModel::addTransportToSipAddress (const QString &sipAddress, const QString &transport) {
-  shared_ptr<linphone::Address> address = linphone::Factory::get()->createAddress(
-    Utils::appStringToCoreString(sipAddress)
-  );
+  shared_ptr<linphone::Address> address = linphone::Factory::get()->createAddress(sipAddress.toStdString());
 
   if (!address)
     return QString("");
 
   address->setTransport(LinphoneUtils::stringToTransportType(transport.toUpper()));
 
-  return Utils::coreStringToAppString(address->asString());
+  return QString::fromStdString(address->asString());
 }
 
 // -----------------------------------------------------------------------------
@@ -207,15 +202,11 @@ QString SipAddressesModel::interpretSipAddress (const QUrl &sipAddress) {
 }
 
 bool SipAddressesModel::addressIsValid (const QString &address) {
-  return !!linphone::Factory::get()->createAddress(
-    Utils::appStringToCoreString(address)
-  );
+  return !!linphone::Factory::get()->createAddress(address.toStdString());
 }
 
 bool SipAddressesModel::sipAddressIsValid (const QString &sipAddress) {
-  shared_ptr<linphone::Address> address = linphone::Factory::get()->createAddress(
-    Utils::appStringToCoreString(sipAddress)
-  );
+  shared_ptr<linphone::Address> address = linphone::Factory::get()->createAddress(sipAddress.toStdString());
   return address && !address->getUsername().empty();
 }
 // Return at most : sip:username@domain
diff --git a/linphone-app/src/utils/Utils.cpp b/linphone-app/src/utils/Utils.cpp
index 112cef63e..3ce2acbe8 100644
--- a/linphone-app/src/utils/Utils.cpp
+++ b/linphone-app/src/utils/Utils.cpp
@@ -97,7 +97,7 @@ std::shared_ptr<linphone::Address> Utils::getMatchingLocalAddress(std::shared_pt
 }
 // Return at most : sip:username@domain
 QString Utils::cleanSipAddress (const QString &sipAddress) {
-  std::shared_ptr<linphone::Address> addr = linphone::Factory::get()->createAddress(Utils::appStringToCoreString(sipAddress));
+  std::shared_ptr<linphone::Address> addr = linphone::Factory::get()->createAddress(sipAddress.toStdString());
   if( addr) {
     QStringList fields = Utils::coreStringToAppString(addr->asStringUriOnly()).split('@');
     if(fields.size() > 0){// maybe useless but it's just to be sure to have a domain