diff --git a/linphone-desktop/src/Utils.hpp b/linphone-desktop/src/Utils.hpp
index 23f88a537..ba5398150 100644
--- a/linphone-desktop/src/Utils.hpp
+++ b/linphone-desktop/src/Utils.hpp
@@ -29,7 +29,7 @@
 // =============================================================================
 
 namespace Utils {
-  inline QString linphoneStringToQString (const std::string &string) {
+  inline QString coreStringToAppString (const std::string &string) {
     return QString::fromLocal8Bit(string.c_str(), static_cast<int>(string.size()));
   }
 
diff --git a/linphone-desktop/src/app/App.cpp b/linphone-desktop/src/app/App.cpp
index ada3350c2..dbf819fba 100644
--- a/linphone-desktop/src/app/App.cpp
+++ b/linphone-desktop/src/app/App.cpp
@@ -435,7 +435,7 @@ void App::createNotifier () {
 // -----------------------------------------------------------------------------
 
 QString App::getConfigLocale () const {
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     CoreManager::getInstance()->getCore()->getConfig()->getString(
       SettingsModel::UI_SECTION, "locale", ""
     )
diff --git a/linphone-desktop/src/app/paths/Paths.cpp b/linphone-desktop/src/app/paths/Paths.cpp
index a10e4e8c9..fdfb44001 100644
--- a/linphone-desktop/src/app/paths/Paths.cpp
+++ b/linphone-desktop/src/app/paths/Paths.cpp
@@ -154,7 +154,7 @@ inline QString getAppMessageHistoryFilePath () {
 // -----------------------------------------------------------------------------
 
 bool Paths::filePathExists (const string &path) {
-  return filePathExists(Utils::linphoneStringToQString(path));
+  return filePathExists(Utils::coreStringToAppString(path));
 }
 
 // -----------------------------------------------------------------------------
diff --git a/linphone-desktop/src/app/providers/AvatarProvider.cpp b/linphone-desktop/src/app/providers/AvatarProvider.cpp
index d020c98a3..67bf221d6 100644
--- a/linphone-desktop/src/app/providers/AvatarProvider.cpp
+++ b/linphone-desktop/src/app/providers/AvatarProvider.cpp
@@ -33,7 +33,7 @@ AvatarProvider::AvatarProvider () : QQuickImageProvider(
     QQmlImageProviderBase::Image,
     QQmlImageProviderBase::ForceAsynchronousImageLoading
   ) {
-  mAvatarsPath = Utils::linphoneStringToQString(Paths::getAvatarsDirPath());
+  mAvatarsPath = Utils::coreStringToAppString(Paths::getAvatarsDirPath());
 }
 
 QImage AvatarProvider::requestImage (const QString &id, QSize *, const QSize &) {
diff --git a/linphone-desktop/src/app/providers/ThumbnailProvider.cpp b/linphone-desktop/src/app/providers/ThumbnailProvider.cpp
index 3fb251855..d346cf1b6 100644
--- a/linphone-desktop/src/app/providers/ThumbnailProvider.cpp
+++ b/linphone-desktop/src/app/providers/ThumbnailProvider.cpp
@@ -33,7 +33,7 @@ ThumbnailProvider::ThumbnailProvider () : QQuickImageProvider(
     QQmlImageProviderBase::Image,
     QQmlImageProviderBase::ForceAsynchronousImageLoading
   ) {
-  mThumbnailsPath = Utils::linphoneStringToQString(Paths::getThumbnailsDirPath());
+  mThumbnailsPath = Utils::coreStringToAppString(Paths::getThumbnailsDirPath());
 }
 
 QImage ThumbnailProvider::requestImage (const QString &id, QSize *, const QSize &) {
diff --git a/linphone-desktop/src/components/assistant/AssistantModel.cpp b/linphone-desktop/src/components/assistant/AssistantModel.cpp
index c91694c40..a0b22e862 100644
--- a/linphone-desktop/src/components/assistant/AssistantModel.cpp
+++ b/linphone-desktop/src/components/assistant/AssistantModel.cpp
@@ -191,7 +191,7 @@ void AssistantModel::reset () {
 // -----------------------------------------------------------------------------
 
 QString AssistantModel::getEmail () const {
-  return ::Utils::linphoneStringToQString(mAccountCreator->getEmail());
+  return ::Utils::coreStringToAppString(mAccountCreator->getEmail());
 }
 
 void AssistantModel::setEmail (const QString &email) {
@@ -215,7 +215,7 @@ void AssistantModel::setEmail (const QString &email) {
 // -----------------------------------------------------------------------------
 
 QString AssistantModel::getPassword () const {
-  return ::Utils::linphoneStringToQString(mAccountCreator->getPassword());
+  return ::Utils::coreStringToAppString(mAccountCreator->getPassword());
 }
 
 void AssistantModel::setPassword (const QString &password) {
@@ -233,11 +233,11 @@ void AssistantModel::setPassword (const QString &password) {
       break;
     case linphone::AccountCreatorPasswordStatusInvalidCharacters:
       error = tr("passwordStatusInvalidCharacters")
-        .arg(::Utils::linphoneStringToQString(config->getString("assistant", "password_regex", "")));
+        .arg(::Utils::coreStringToAppString(config->getString("assistant", "password_regex", "")));
       break;
     case linphone::AccountCreatorPasswordStatusMissingCharacters:
       error = tr("passwordStatusMissingCharacters")
-        .arg(::Utils::linphoneStringToQString(config->getString("assistant", "missing_characters", "")));
+        .arg(::Utils::coreStringToAppString(config->getString("assistant", "missing_characters", "")));
       break;
   }
 
@@ -247,7 +247,7 @@ void AssistantModel::setPassword (const QString &password) {
 // -----------------------------------------------------------------------------
 
 QString AssistantModel::getPhoneNumber () const {
-  return ::Utils::linphoneStringToQString(mAccountCreator->getPhoneNumber());
+  return ::Utils::coreStringToAppString(mAccountCreator->getPhoneNumber());
 }
 
 void AssistantModel::setPhoneNumber (const QString &phoneNumber) {
@@ -262,7 +262,7 @@ void AssistantModel::setPhoneNumber (const QString &phoneNumber) {
 // -----------------------------------------------------------------------------
 
 QString AssistantModel::getUsername () const {
-  return ::Utils::linphoneStringToQString(mAccountCreator->getUsername());
+  return ::Utils::coreStringToAppString(mAccountCreator->getUsername());
 }
 
 void AssistantModel::setUsername (const QString &username) {
@@ -277,7 +277,7 @@ void AssistantModel::setUsername (const QString &username) {
 // -----------------------------------------------------------------------------
 
 QString AssistantModel::getDisplayName () const {
-  return ::Utils::linphoneStringToQString(mAccountCreator->getDisplayName());
+  return ::Utils::coreStringToAppString(mAccountCreator->getDisplayName());
 }
 
 void AssistantModel::setDisplayName (const QString &displayName) {
@@ -298,7 +298,7 @@ QString AssistantModel::getConfigFilename () const {
 void AssistantModel::setConfigFilename (const QString &configFilename) {
   mConfigFilename = configFilename;
 
-  QString configPath = ::Utils::linphoneStringToQString(Paths::getAssistantConfigDirPath()) + configFilename;
+  QString configPath = ::Utils::coreStringToAppString(Paths::getAssistantConfigDirPath()) + configFilename;
   qInfo() << QStringLiteral("Set config on assistant: `%1`.").arg(configPath);
 
   CoreManager::getInstance()->getCore()->getConfig()->loadFromXmlFile(
@@ -325,7 +325,7 @@ QString AssistantModel::mapAccountCreatorUsernameStatusToString (linphone::Accou
       break;
     case linphone::AccountCreatorUsernameStatusInvalidCharacters:
       error = tr("usernameStatusInvalidCharacters")
-        .arg(::Utils::linphoneStringToQString(config->getString("assistant", "username_regex", "")));
+        .arg(::Utils::coreStringToAppString(config->getString("assistant", "username_regex", "")));
       break;
     case linphone::AccountCreatorUsernameStatusInvalid:
       error = tr("usernameStatusInvalid");
diff --git a/linphone-desktop/src/components/authentication/AuthenticationNotifier.cpp b/linphone-desktop/src/components/authentication/AuthenticationNotifier.cpp
index 27a82ff2d..c5ec4d6fe 100644
--- a/linphone-desktop/src/components/authentication/AuthenticationNotifier.cpp
+++ b/linphone-desktop/src/components/authentication/AuthenticationNotifier.cpp
@@ -39,12 +39,12 @@ AuthenticationNotifier::AuthenticationNotifier (QObject *parent) : QObject(paren
 void AuthenticationNotifier::handleAuthenticationRequested (const shared_ptr<linphone::AuthInfo> &authInfo) {
   emit authenticationRequested(
     QVariant::fromValue(authInfo),
-    ::Utils::linphoneStringToQString(authInfo->getRealm()),
+    ::Utils::coreStringToAppString(authInfo->getRealm()),
     QStringLiteral("%1@%2").arg(
-      ::Utils::linphoneStringToQString(authInfo->getUsername())
+      ::Utils::coreStringToAppString(authInfo->getUsername())
     ).arg(
-      ::Utils::linphoneStringToQString(authInfo->getDomain())
+      ::Utils::coreStringToAppString(authInfo->getDomain())
     ),
-    ::Utils::linphoneStringToQString(authInfo->getUserid())
+    ::Utils::coreStringToAppString(authInfo->getUserid())
   );
 }
diff --git a/linphone-desktop/src/components/call/CallModel.cpp b/linphone-desktop/src/components/call/CallModel.cpp
index d164e234c..74247fcd4 100644
--- a/linphone-desktop/src/components/call/CallModel.cpp
+++ b/linphone-desktop/src/components/call/CallModel.cpp
@@ -71,7 +71,7 @@ CallModel::~CallModel () {
 // -----------------------------------------------------------------------------
 
 QString CallModel::getSipAddress () const {
-  return ::Utils::linphoneStringToQString(mCall->getRemoteAddress()->asStringUriOnly());
+  return ::Utils::coreStringToAppString(mCall->getRemoteAddress()->asStringUriOnly());
 }
 
 // -----------------------------------------------------------------------------
@@ -541,7 +541,7 @@ void CallModel::updateStats (const shared_ptr<const linphone::CallStats> &callSt
   statsList.clear();
 
   statsList << createStat(tr("callStatsCodec"), payloadType
-    ? QString("%1 / %2kHz").arg(Utils::linphoneStringToQString(payloadType->getMimeType())).arg(payloadType->getClockRate() / 1000)
+    ? QString("%1 / %2kHz").arg(Utils::coreStringToAppString(payloadType->getMimeType())).arg(payloadType->getClockRate() / 1000)
     : "");
   statsList << createStat(tr("callStatsUploadBandwidth"), QString("%1 kbits/s").arg(int(callStats->getUploadBandwidth())));
   statsList << createStat(tr("callStatsDownloadBandwidth"), QString("%1 kbits/s").arg(int(callStats->getDownloadBandwidth())));
@@ -555,7 +555,7 @@ void CallModel::updateStats (const shared_ptr<const linphone::CallStats> &callSt
       statsList << createStat(tr("callStatsJitterBuffer"), QString("%1 ms").arg(callStats->getJitterBufferSizeMs()));
       break;
     case linphone::StreamTypeVideo: {
-      QString sentVideoDefinitionName = Utils::linphoneStringToQString(params->getSentVideoDefinition()->getName());
+      QString sentVideoDefinitionName = Utils::coreStringToAppString(params->getSentVideoDefinition()->getName());
       QString sentVideoDefinition = QString("%1x%2")
         .arg(params->getSentVideoDefinition()->getWidth())
         .arg(params->getSentVideoDefinition()->getHeight());
@@ -564,7 +564,7 @@ void CallModel::updateStats (const shared_ptr<const linphone::CallStats> &callSt
         ? sentVideoDefinition
         : QString("%1 (%2)").arg(sentVideoDefinition).arg(sentVideoDefinitionName));
 
-      QString receivedVideoDefinitionName = Utils::linphoneStringToQString(params->getReceivedVideoDefinition()->getName());
+      QString receivedVideoDefinitionName = Utils::coreStringToAppString(params->getReceivedVideoDefinition()->getName());
       QString receivedVideoDefinition = QString("%1x%2")
         .arg(params->getReceivedVideoDefinition()->getWidth())
         .arg(params->getReceivedVideoDefinition()->getHeight());
diff --git a/linphone-desktop/src/components/chat/ChatModel.cpp b/linphone-desktop/src/components/chat/ChatModel.cpp
index 8316434e4..3b6e1d737 100644
--- a/linphone-desktop/src/components/chat/ChatModel.cpp
+++ b/linphone-desktop/src/components/chat/ChatModel.cpp
@@ -52,14 +52,14 @@ inline void fillThumbnailProperty (QVariantMap &dest, const shared_ptr<linphone:
   string fileId = message->getAppdata();
   if (!fileId.empty() && !dest.contains("thumbnail"))
     dest["thumbnail"] = QStringLiteral("image://%1/%2")
-      .arg(ThumbnailProvider::PROVIDER_ID).arg(::Utils::linphoneStringToQString(fileId));
+      .arg(ThumbnailProvider::PROVIDER_ID).arg(::Utils::coreStringToAppString(fileId));
 }
 
 inline void createThumbnail (const shared_ptr<linphone::ChatMessage> &message) {
   if (!message->getAppdata().empty())
     return;
 
-  QString thumbnailPath = ::Utils::linphoneStringToQString(message->getFileTransferFilepath());
+  QString thumbnailPath = ::Utils::coreStringToAppString(message->getFileTransferFilepath());
 
   QImage image(thumbnailPath);
   if (image.isNull())
@@ -73,7 +73,7 @@ inline void createThumbnail (const shared_ptr<linphone::ChatMessage> &message) {
   QString uuid = QUuid::createUuid().toString();
   QString fileId = QStringLiteral("%1.jpg").arg(uuid.mid(1, uuid.length() - 2));
 
-  if (!thumbnail.save(::Utils::linphoneStringToQString(Paths::getThumbnailsDirPath()) + fileId, "jpg", 100)) {
+  if (!thumbnail.save(::Utils::coreStringToAppString(Paths::getThumbnailsDirPath()) + fileId, "jpg", 100)) {
     qWarning() << QStringLiteral("Unable to create thumbnail of: `%1`.").arg(thumbnailPath);
     return;
   }
@@ -87,7 +87,7 @@ inline void removeFileMessageThumbnail (const shared_ptr<linphone::ChatMessage>
 
     string fileId = message->getAppdata();
     if (!fileId.empty()) {
-      QString thumbnailPath = ::Utils::linphoneStringToQString(Paths::getThumbnailsDirPath() + fileId);
+      QString thumbnailPath = ::Utils::coreStringToAppString(Paths::getThumbnailsDirPath() + fileId);
       if (!QFile::remove(thumbnailPath))
         qWarning() << QStringLiteral("Unable to remove `%1`.").arg(thumbnailPath);
     }
@@ -243,7 +243,7 @@ QString ChatModel::getSipAddress () const {
   if (!mChatRoom)
     return "";
 
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     mChatRoom->getPeerAddress()->asStringUriOnly()
   );
 }
@@ -435,14 +435,14 @@ void ChatModel::downloadFile (int id, const QString &downloadPath) {
 void ChatModel::fillMessageEntry (QVariantMap &dest, const shared_ptr<linphone::ChatMessage> &message) {
   dest["type"] = EntryType::MessageEntry;
   dest["timestamp"] = QDateTime::fromMSecsSinceEpoch(message->getTime() * 1000);
-  dest["content"] = ::Utils::linphoneStringToQString(message->getText());
+  dest["content"] = ::Utils::coreStringToAppString(message->getText());
   dest["isOutgoing"] = message->isOutgoing() || message->getState() == linphone::ChatMessageStateIdle;
   dest["status"] = message->getState();
 
   shared_ptr<const linphone::Content> content = message->getFileTransferInformation();
   if (content) {
     dest["fileSize"] = static_cast<quint64>(content->getSize());
-    dest["fileName"] = ::Utils::linphoneStringToQString(content->getName());
+    dest["fileName"] = ::Utils::coreStringToAppString(content->getName());
     fillThumbnailProperty(dest, message);
   }
 }
diff --git a/linphone-desktop/src/components/codecs/AbstractCodecsModel.cpp b/linphone-desktop/src/components/codecs/AbstractCodecsModel.cpp
index 1679f1972..ec157b166 100644
--- a/linphone-desktop/src/components/codecs/AbstractCodecsModel.cpp
+++ b/linphone-desktop/src/components/codecs/AbstractCodecsModel.cpp
@@ -96,7 +96,7 @@ void AbstractCodecsModel::setRecvFmtp (int id, const QString &recvFmtp) {
   shared_ptr<linphone::PayloadType> codec = getCodecFromMap(map);
 
   codec->setRecvFmtp(::Utils::qStringToLinphoneString(recvFmtp));
-  map["recvFmtp"] = ::Utils::linphoneStringToQString(codec->getRecvFmtp());
+  map["recvFmtp"] = ::Utils::coreStringToAppString(codec->getRecvFmtp());
 
   emit dataChanged(index(id, 0), index(id, 0));
 }
@@ -157,14 +157,14 @@ void AbstractCodecsModel::addCodec (shared_ptr<linphone::PayloadType> &codec) {
   map["bitrate"] = codec->getNormalBitrate();
   map["channels"] = codec->getChannels();
   map["clockRate"] = codec->getClockRate();
-  map["description"] = ::Utils::linphoneStringToQString(codec->getDescription());
+  map["description"] = ::Utils::coreStringToAppString(codec->getDescription());
   map["enabled"] = codec->enabled();
-  map["encoderDescription"] = ::Utils::linphoneStringToQString(codec->getEncoderDescription());
+  map["encoderDescription"] = ::Utils::coreStringToAppString(codec->getEncoderDescription());
   map["isUsable"] = codec->isUsable();
   map["isVbr"] = codec->isVbr();
-  map["mime"] = ::Utils::linphoneStringToQString(codec->getMimeType());
+  map["mime"] = ::Utils::coreStringToAppString(codec->getMimeType());
   map["number"] = codec->getNumber();
-  map["recvFmtp"] = ::Utils::linphoneStringToQString(codec->getRecvFmtp());
+  map["recvFmtp"] = ::Utils::coreStringToAppString(codec->getRecvFmtp());
   map["__codec"] = QVariant::fromValue(codec);
 
   mCodecs << map;
diff --git a/linphone-desktop/src/components/conference/ConferenceAddModel.cpp b/linphone-desktop/src/components/conference/ConferenceAddModel.cpp
index b2b3edf1d..2fdfa8285 100644
--- a/linphone-desktop/src/components/conference/ConferenceAddModel.cpp
+++ b/linphone-desktop/src/components/conference/ConferenceAddModel.cpp
@@ -71,7 +71,7 @@ QVariant ConferenceHelperModel::ConferenceAddModel::data (const QModelIndex &ind
 // -----------------------------------------------------------------------------
 
 bool ConferenceHelperModel::ConferenceAddModel::addToConference (const shared_ptr<const linphone::Address> &linphoneAddress) {
-  const QString &sipAddress = ::Utils::linphoneStringToQString(linphoneAddress->asStringUriOnly());
+  const QString &sipAddress = ::Utils::coreStringToAppString(linphoneAddress->asStringUriOnly());
   if (mSipAddresses.contains(sipAddress))
     return false;
 
@@ -145,7 +145,7 @@ void ConferenceHelperModel::ConferenceAddModel::update () {
     if (!call->getParams()->getLocalConferenceMode())
       continue;
 
-    const QString &sipAddress = ::Utils::linphoneStringToQString(call->getRemoteAddress()->asStringUriOnly());
+    const QString &sipAddress = ::Utils::coreStringToAppString(call->getRemoteAddress()->asStringUriOnly());
     if (!mSipAddresses.contains(sipAddress))
       call->terminate();
   }
@@ -159,7 +159,7 @@ void ConferenceHelperModel::ConferenceAddModel::update () {
 // -----------------------------------------------------------------------------
 
 void ConferenceHelperModel::ConferenceAddModel::addToConferencePrivate (const shared_ptr<linphone::Address> &linphoneAddress) {
-  QString sipAddress = ::Utils::linphoneStringToQString(linphoneAddress->asStringUriOnly());
+  QString sipAddress = ::Utils::coreStringToAppString(linphoneAddress->asStringUriOnly());
   QVariantMap map = CoreManager::getInstance()->getSipAddressesModel()->find(sipAddress);
 
   map["sipAddress"] = sipAddress;
diff --git a/linphone-desktop/src/components/contact/VcardModel.cpp b/linphone-desktop/src/components/contact/VcardModel.cpp
index 9606aec93..128c583b9 100644
--- a/linphone-desktop/src/components/contact/VcardModel.cpp
+++ b/linphone-desktop/src/components/contact/VcardModel.cpp
@@ -80,7 +80,7 @@ static void removeBelcardPhoto (const shared_ptr<belcard::BelCard> &belcard, boo
 
   for (const auto photo : photos) {
     QString imagePath(
-      ::Utils::linphoneStringToQString(
+      ::Utils::coreStringToAppString(
         Paths::getAvatarsDirPath() + photo->getValue().substr(sizeof(VCARD_SCHEME) - 1)
       )
     );
@@ -140,7 +140,7 @@ QString VcardModel::getAvatar () const {
 
   // Returns right path.
   return QStringLiteral("image://%1/%2").arg(AvatarProvider::PROVIDER_ID).arg(
-    ::Utils::linphoneStringToQString(photo->getValue().substr(sizeof(VCARD_SCHEME) - 1))
+    ::Utils::coreStringToAppString(photo->getValue().substr(sizeof(VCARD_SCHEME) - 1))
   );
 }
 
@@ -173,7 +173,7 @@ bool VcardModel::setAvatar (const QString &path) {
         .arg(uuid.mid(1, uuid.length() - 2)) // Remove `{}`.
         .arg(info.suffix());
 
-      QString dest = ::Utils::linphoneStringToQString(Paths::getAvatarsDirPath()) + fileId;
+      QString dest = ::Utils::coreStringToAppString(Paths::getAvatarsDirPath()) + fileId;
 
       if (!file.copy(dest))
         return false;
@@ -205,7 +205,7 @@ bool VcardModel::setAvatar (const QString &path) {
 // -----------------------------------------------------------------------------
 
 QString VcardModel::getUsername () const {
-  return ::Utils::linphoneStringToQString(mVcard->getFullName());
+  return ::Utils::coreStringToAppString(mVcard->getFullName());
 }
 
 void VcardModel::setUsername (const QString &username) {
@@ -242,10 +242,10 @@ QVariantMap VcardModel::getAddress () const {
     return map;
 
   shared_ptr<belcard::BelCardAddress> address = addresses.front();
-  map["street"] = ::Utils::linphoneStringToQString(address->getStreet());
-  map["locality"] = ::Utils::linphoneStringToQString(address->getLocality());
-  map["postalCode"] = ::Utils::linphoneStringToQString(address->getPostalCode());
-  map["country"] = ::Utils::linphoneStringToQString(address->getCountry());
+  map["street"] = ::Utils::coreStringToAppString(address->getStreet());
+  map["locality"] = ::Utils::coreStringToAppString(address->getLocality());
+  map["postalCode"] = ::Utils::coreStringToAppString(address->getPostalCode());
+  map["country"] = ::Utils::coreStringToAppString(address->getCountry());
 
   return map;
 }
@@ -293,10 +293,10 @@ QVariantList VcardModel::getSipAddresses () const {
     shared_ptr<linphone::Address> linphoneAddress = core->createAddress(value);
 
     if (linphoneAddress)
-      list << ::Utils::linphoneStringToQString(linphoneAddress->asStringUriOnly());
+      list << ::Utils::coreStringToAppString(linphoneAddress->asStringUriOnly());
     else
       qWarning() << QStringLiteral("Unable to parse sip address: `%1`")
-        .arg(::Utils::linphoneStringToQString(value));
+        .arg(::Utils::coreStringToAppString(value));
   }
 
   return list;
@@ -334,7 +334,7 @@ void VcardModel::removeSipAddress (const QString &sipAddress) {
   shared_ptr<belcard::BelCard> belcard = mVcard->getVcard();
   list<shared_ptr<belcard::BelCardImpp> > addresses = belcard->getImpp();
   shared_ptr<belcard::BelCardImpp> value = findBelCardValue(
-      addresses, ::Utils::linphoneStringToQString(interpretSipAddress(sipAddress))
+      addresses, ::Utils::coreStringToAppString(interpretSipAddress(sipAddress))
     );
 
   if (!value) {
@@ -366,7 +366,7 @@ QVariantList VcardModel::getCompanies () const {
   QVariantList list;
 
   for (const auto &company : mVcard->getVcard()->getRoles())
-    list.append(::Utils::linphoneStringToQString(company->getValue()));
+    list.append(::Utils::coreStringToAppString(company->getValue()));
 
   return list;
 }
@@ -420,7 +420,7 @@ QVariantList VcardModel::getEmails () const {
   QVariantList list;
 
   for (const auto &email : mVcard->getVcard()->getEmails())
-    list.append(::Utils::linphoneStringToQString(email->getValue()));
+    list.append(::Utils::coreStringToAppString(email->getValue()));
 
   return list;
 }
@@ -475,7 +475,7 @@ QVariantList VcardModel::getUrls () const {
   QVariantList list;
 
   for (const auto &url : mVcard->getVcard()->getURLs())
-    list.append(::Utils::linphoneStringToQString(url->getValue()));
+    list.append(::Utils::coreStringToAppString(url->getValue()));
 
   return list;
 }
diff --git a/linphone-desktop/src/components/contacts/ContactsListProxyModel.cpp b/linphone-desktop/src/components/contacts/ContactsListProxyModel.cpp
index a3cf9332d..b35998b49 100644
--- a/linphone-desktop/src/components/contacts/ContactsListProxyModel.cpp
+++ b/linphone-desktop/src/components/contacts/ContactsListProxyModel.cpp
@@ -134,7 +134,7 @@ float ContactsListProxyModel::computeContactWeight (const ContactModel *contact)
   float size = static_cast<float>(addresses.size());
   for (auto it = addresses.cbegin(); it != addresses.cend(); ++it)
     weight += computeStringWeight(
-        ::Utils::linphoneStringToQString((*it)->asStringUriOnly()),
+        ::Utils::coreStringToAppString((*it)->asStringUriOnly()),
         SIP_ADDRESSES_WEIGHT / size
       );
 
diff --git a/linphone-desktop/src/components/core/CoreHandlers.cpp b/linphone-desktop/src/components/core/CoreHandlers.cpp
index bafdc8410..9b32cc72c 100644
--- a/linphone-desktop/src/components/core/CoreHandlers.cpp
+++ b/linphone-desktop/src/components/core/CoreHandlers.cpp
@@ -148,7 +148,7 @@ void CoreHandlers::onNotifyPresenceReceivedForUriOrTel (
   const string &uriOrTel,
   const shared_ptr<const linphone::PresenceModel> &presenceModel
 ) {
-  emit presenceReceived(::Utils::linphoneStringToQString(uriOrTel), presenceModel);
+  emit presenceReceived(::Utils::coreStringToAppString(uriOrTel), presenceModel);
 }
 
 void CoreHandlers::onNotifyPresenceReceived (
diff --git a/linphone-desktop/src/components/core/CoreManager.cpp b/linphone-desktop/src/components/core/CoreManager.cpp
index 684e34f8d..d1c87a3b2 100644
--- a/linphone-desktop/src/components/core/CoreManager.cpp
+++ b/linphone-desktop/src/components/core/CoreManager.cpp
@@ -142,7 +142,7 @@ void CoreManager::createLinphoneCore (const QString &configPath) {
 // -----------------------------------------------------------------------------
 
 QString CoreManager::getVersion () const {
-  return ::Utils::linphoneStringToQString(mCore->getVersion());
+  return ::Utils::coreStringToAppString(mCore->getVersion());
 }
 
 // -----------------------------------------------------------------------------
diff --git a/linphone-desktop/src/components/notifier/Notifier.cpp b/linphone-desktop/src/components/notifier/Notifier.cpp
index 8e0a5d6b5..a8a9786c8 100644
--- a/linphone-desktop/src/components/notifier/Notifier.cpp
+++ b/linphone-desktop/src/components/notifier/Notifier.cpp
@@ -230,8 +230,8 @@ void Notifier::notifyReceivedMessage (const shared_ptr<linphone::ChatMessage> &m
     return;
 
   QVariantMap map;
-  map["message"] = ::Utils::linphoneStringToQString(message->getText());
-  map["sipAddress"] = ::Utils::linphoneStringToQString(message->getFromAddress()->asStringUriOnly());
+  map["message"] = ::Utils::coreStringToAppString(message->getText());
+  map["sipAddress"] = ::Utils::coreStringToAppString(message->getFromAddress()->asStringUriOnly());
   map["window"].setValue(App::getInstance()->getMainWindow());
 
   ::setProperty(*notification, NOTIFICATION_PROPERTY_DATA, map);
@@ -244,7 +244,7 @@ void Notifier::notifyReceivedFileMessage (const shared_ptr<linphone::ChatMessage
     return;
 
   QVariantMap map;
-  map["fileUri"] = ::Utils::linphoneStringToQString(message->getFileTransferFilepath());
+  map["fileUri"] = ::Utils::coreStringToAppString(message->getFileTransferFilepath());
   map["fileSize"] = static_cast<quint64>(message->getFileTransferInformation()->getSize());
 
   ::setProperty(*notification, NOTIFICATION_PROPERTY_DATA, map);
diff --git a/linphone-desktop/src/components/settings/AccountSettingsModel.cpp b/linphone-desktop/src/components/settings/AccountSettingsModel.cpp
index 8d1ebbcf8..093cdb984 100644
--- a/linphone-desktop/src/components/settings/AccountSettingsModel.cpp
+++ b/linphone-desktop/src/components/settings/AccountSettingsModel.cpp
@@ -68,12 +68,12 @@ 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::linphoneStringToQString(proxyConfig->getIdentityAddress()->asString()));
+        .arg(::Utils::coreStringToAppString(proxyConfig->getIdentityAddress()->asString()));
       return false;
     }
   } else if (core->addProxyConfig(proxyConfig) == -1) {
     qWarning() << QStringLiteral("Unable to add proxy config: `%1`.")
-      .arg(::Utils::linphoneStringToQString(proxyConfig->getIdentityAddress()->asString()));
+      .arg(::Utils::coreStringToAppString(proxyConfig->getIdentityAddress()->asString()));
     return false;
   }
 
@@ -90,15 +90,15 @@ QVariantMap AccountSettingsModel::getProxyConfigDescription (const shared_ptr<li
   {
     const shared_ptr<const linphone::Address> address = proxyConfig->getIdentityAddress();
     map["sipAddress"] = address
-      ? ::Utils::linphoneStringToQString(proxyConfig->getIdentityAddress()->asStringUriOnly())
+      ? ::Utils::coreStringToAppString(proxyConfig->getIdentityAddress()->asStringUriOnly())
       : "";
   }
 
-  map["serverAddress"] = ::Utils::linphoneStringToQString(proxyConfig->getServerAddr());
+  map["serverAddress"] = ::Utils::coreStringToAppString(proxyConfig->getServerAddr());
   map["registrationDuration"] = proxyConfig->getPublishExpires();
-  map["transport"] = ::Utils::linphoneStringToQString(proxyConfig->getTransport());
-  map["route"] = ::Utils::linphoneStringToQString(proxyConfig->getRoute());
-  map["contactParams"] = ::Utils::linphoneStringToQString(proxyConfig->getContactParameters());
+  map["transport"] = ::Utils::coreStringToAppString(proxyConfig->getTransport());
+  map["route"] = ::Utils::coreStringToAppString(proxyConfig->getRoute());
+  map["contactParams"] = ::Utils::coreStringToAppString(proxyConfig->getContactParameters());
   map["avpfInterval"] = proxyConfig->getAvpfRrInterval();
   map["registerEnabled"] = proxyConfig->registerEnabled();
   map["publishPresence"] = proxyConfig->publishEnabled();
@@ -190,7 +190,7 @@ QString AccountSettingsModel::getUsername () const {
   shared_ptr<const linphone::Address> address = getUsedSipAddress();
   const string &displayName = address->getDisplayName();
 
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     displayName.empty() ? address->getUsername() : displayName
   );
 }
@@ -201,7 +201,7 @@ void AccountSettingsModel::setUsername (const QString &username) {
 
   if (newAddress->setDisplayName(::Utils::qStringToLinphoneString(username))) {
     qWarning() << QStringLiteral("Unable to set displayName on sip address: `%1`.")
-      .arg(::Utils::linphoneStringToQString(newAddress->asStringUriOnly()));
+      .arg(::Utils::coreStringToAppString(newAddress->asStringUriOnly()));
   } else {
     setUsedSipAddress(newAddress);
   }
@@ -210,7 +210,7 @@ void AccountSettingsModel::setUsername (const QString &username) {
 }
 
 QString AccountSettingsModel::getSipAddress () const {
-  return ::Utils::linphoneStringToQString(getUsedSipAddress()->asStringUriOnly());
+  return ::Utils::coreStringToAppString(getUsedSipAddress()->asStringUriOnly());
 }
 
 AccountSettingsModel::RegistrationState AccountSettingsModel::getRegistrationState () const {
@@ -221,7 +221,7 @@ AccountSettingsModel::RegistrationState AccountSettingsModel::getRegistrationSta
 // -----------------------------------------------------------------------------
 
 QString AccountSettingsModel::getPrimaryUsername () const {
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     CoreManager::getInstance()->getCore()->getPrimaryContactParsed()->getUsername()
   );
 }
@@ -239,7 +239,7 @@ void AccountSettingsModel::setPrimaryUsername (const QString &username) {
 }
 
 QString AccountSettingsModel::getPrimaryDisplayName () const {
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     CoreManager::getInstance()->getCore()->getPrimaryContactParsed()->getDisplayName()
   );
 }
@@ -255,7 +255,7 @@ void AccountSettingsModel::setPrimaryDisplayName (const QString &displayName) {
 }
 
 QString AccountSettingsModel::getPrimarySipAddress () const {
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     CoreManager::getInstance()->getCore()->getPrimaryContactParsed()->asString()
   );
 }
@@ -268,13 +268,13 @@ QVariantList AccountSettingsModel::getAccounts () const {
 
   {
     QVariantMap account;
-    account["sipAddress"] = ::Utils::linphoneStringToQString(core->getPrimaryContactParsed()->asStringUriOnly());
+    account["sipAddress"] = ::Utils::coreStringToAppString(core->getPrimaryContactParsed()->asStringUriOnly());
     accounts << account;
   }
 
   for (const auto &proxyConfig : core->getProxyConfigList()) {
     QVariantMap account;
-    account["sipAddress"] = ::Utils::linphoneStringToQString(proxyConfig->getIdentityAddress()->asStringUriOnly());
+    account["sipAddress"] = ::Utils::coreStringToAppString(proxyConfig->getIdentityAddress()->asStringUriOnly());
     account["proxyConfig"].setValue(proxyConfig);
     accounts << account;
   }
diff --git a/linphone-desktop/src/components/settings/SettingsModel.cpp b/linphone-desktop/src/components/settings/SettingsModel.cpp
index b2a774af4..730fb18ca 100644
--- a/linphone-desktop/src/components/settings/SettingsModel.cpp
+++ b/linphone-desktop/src/components/settings/SettingsModel.cpp
@@ -46,7 +46,7 @@ QStringList SettingsModel::getAudioDevices () const {
   QStringList list;
 
   for (const auto &device : CoreManager::getInstance()->getCore()->getSoundDevices())
-    list << ::Utils::linphoneStringToQString(device);
+    list << ::Utils::coreStringToAppString(device);
 
   return list;
 }
@@ -54,7 +54,7 @@ QStringList SettingsModel::getAudioDevices () const {
 // -----------------------------------------------------------------------------
 
 QString SettingsModel::getCaptureDevice () const {
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     CoreManager::getInstance()->getCore()->getCaptureDevice()
   );
 }
@@ -69,7 +69,7 @@ void SettingsModel::setCaptureDevice (const QString &device) {
 // -----------------------------------------------------------------------------
 
 QString SettingsModel::getPlaybackDevice () const {
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     CoreManager::getInstance()->getCore()->getPlaybackDevice()
   );
 }
@@ -84,7 +84,7 @@ void SettingsModel::setPlaybackDevice (const QString &device) {
 // -----------------------------------------------------------------------------
 
 QString SettingsModel::getRingerDevice () const {
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     CoreManager::getInstance()->getCore()->getRingerDevice()
   );
 }
@@ -99,7 +99,7 @@ void SettingsModel::setRingerDevice (const QString &device) {
 // -----------------------------------------------------------------------------
 
 QString SettingsModel::getRingPath () const {
-  return ::Utils::linphoneStringToQString(CoreManager::getInstance()->getCore()->getRing());
+  return ::Utils::coreStringToAppString(CoreManager::getInstance()->getCore()->getRing());
 }
 
 void SettingsModel::setRingPath (const QString &path) {
@@ -131,7 +131,7 @@ QStringList SettingsModel::getVideoDevices () const {
   QStringList list;
 
   for (const auto &device : CoreManager::getInstance()->getCore()->getVideoDevices())
-    list << ::Utils::linphoneStringToQString(device);
+    list << ::Utils::coreStringToAppString(device);
 
   return list;
 }
@@ -139,7 +139,7 @@ QStringList SettingsModel::getVideoDevices () const {
 // -----------------------------------------------------------------------------
 
 QString SettingsModel::getVideoDevice () const {
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     CoreManager::getInstance()->getCore()->getVideoDevice()
   );
 }
@@ -154,7 +154,7 @@ void SettingsModel::setVideoDevice (const QString &device) {
 // -----------------------------------------------------------------------------
 
 QString SettingsModel::getVideoPreset () const {
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     CoreManager::getInstance()->getCore()->getVideoPreset()
   );
 }
@@ -182,7 +182,7 @@ void SettingsModel::setVideoFramerate (int framerate) {
 inline QVariantMap createMapFromVideoDefinition (const shared_ptr<const linphone::VideoDefinition> &definition) {
   QVariantMap map;
 
-  map["name"] = ::Utils::linphoneStringToQString(definition->getName());
+  map["name"] = ::Utils::coreStringToAppString(definition->getName());
   map["width"] = definition->getWidth();
   map["height"] = definition->getHeight();
   map["__definition"] = QVariant::fromValue(definition);
@@ -236,7 +236,7 @@ void SettingsModel::setAutoAnswerStatus (bool status) {
 // -----------------------------------------------------------------------------
 
 QString SettingsModel::getFileTransferUrl () const {
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     CoreManager::getInstance()->getCore()->getFileTransferServer()
   );
 }
@@ -523,7 +523,7 @@ void SettingsModel::setTurnEnabled (bool status) {
 // -----------------------------------------------------------------------------
 
 QString SettingsModel::getStunServer () const {
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     CoreManager::getInstance()->getCore()->getNatPolicy()->getStunServer()
   );
 }
@@ -537,7 +537,7 @@ void SettingsModel::setStunServer (const QString &stunServer) {
 // -----------------------------------------------------------------------------
 
 QString SettingsModel::getTurnUser () const {
-  return ::Utils::linphoneStringToQString(
+  return ::Utils::coreStringToAppString(
     CoreManager::getInstance()->getCore()->getNatPolicy()->getStunServerUsername()
   );
 }
@@ -557,7 +557,7 @@ QString SettingsModel::getTurnPassword () const {
   shared_ptr<linphone::NatPolicy> natPolicy = core->getNatPolicy();
   shared_ptr<const linphone::AuthInfo> authInfo = core->findAuthInfo(natPolicy->getStunServerUsername(), "", "");
 
-  return authInfo ? ::Utils::linphoneStringToQString(authInfo->getPasswd()) : "";
+  return authInfo ? ::Utils::coreStringToAppString(authInfo->getPasswd()) : "";
 }
 
 void SettingsModel::setTurnPassword (const QString &password) {
@@ -616,7 +616,7 @@ void SettingsModel::setDscpVideo (int dscp) {
 
 QString SettingsModel::getSavedScreenshotsFolder () const {
   return QDir::cleanPath(
-    ::Utils::linphoneStringToQString(
+    ::Utils::coreStringToAppString(
       mConfig->getString(UI_SECTION, "saved_screenshots_folder", Paths::getCapturesDirPath())
     )
   ) + QDir::separator();
@@ -633,7 +633,7 @@ void SettingsModel::setSavedScreenshotsFolder (const QString &folder) {
 
 QString SettingsModel::getSavedVideosFolder () const {
   return QDir::cleanPath(
-    ::Utils::linphoneStringToQString(
+    ::Utils::coreStringToAppString(
       mConfig->getString(UI_SECTION, "saved_videos_folder", Paths::getCapturesDirPath())
     )
   ) + QDir::separator();
@@ -649,7 +649,7 @@ void SettingsModel::setSavedVideosFolder (const QString &folder) {
 // -----------------------------------------------------------------------------
 
 QString SettingsModel::getRemoteProvisioning () const {
-  return ::Utils::linphoneStringToQString(CoreManager::getInstance()->getCore()->getProvisioningUri());
+  return ::Utils::coreStringToAppString(CoreManager::getInstance()->getCore()->getProvisioningUri());
 }
 
 void SettingsModel::setRemoteProvisioning (const QString &remoteProvisioning) {
diff --git a/linphone-desktop/src/components/sip-addresses/SipAddressesModel.cpp b/linphone-desktop/src/components/sip-addresses/SipAddressesModel.cpp
index 0d8d7960e..f872d6123 100644
--- a/linphone-desktop/src/components/sip-addresses/SipAddressesModel.cpp
+++ b/linphone-desktop/src/components/sip-addresses/SipAddressesModel.cpp
@@ -145,7 +145,7 @@ QString SipAddressesModel::interpretUrl (const QString &sipAddress) const {
       ::Utils::qStringToLinphoneString(sipAddress)
     );
 
-  return lAddress ? ::Utils::linphoneStringToQString(lAddress->asStringUriOnly()) : "";
+  return lAddress ? ::Utils::coreStringToAppString(lAddress->asStringUriOnly()) : "";
 }
 
 QString SipAddressesModel::getTransportFromSipAddress (const QString &sipAddress) const {
@@ -188,7 +188,7 @@ QString SipAddressesModel::addTransportToSipAddress (const QString &sipAddress,
   else
     address->setTransport(linphone::TransportType::TransportTypeDtls);
 
-  return ::Utils::linphoneStringToQString(address->asString());
+  return ::Utils::coreStringToAppString(address->asString());
 }
 
 bool SipAddressesModel::sipAddressIsValid (const QString &sipAddress) {
@@ -257,7 +257,7 @@ void SipAddressesModel::handleSipAddressRemoved (ContactModel *contact, const QS
 }
 
 void SipAddressesModel::handleMessageReceived (const shared_ptr<linphone::ChatMessage> &message) {
-  const QString &sipAddress = ::Utils::linphoneStringToQString(message->getFromAddress()->asStringUriOnly());
+  const QString &sipAddress = ::Utils::coreStringToAppString(message->getFromAddress()->asStringUriOnly());
   addOrUpdateSipAddress(sipAddress, message);
 }
 
@@ -271,7 +271,7 @@ void SipAddressesModel::handleCallStateChanged (
 
   if (state == linphone::CallStateEnd || state == linphone::CallStateError)
     addOrUpdateSipAddress(
-      ::Utils::linphoneStringToQString(call->getRemoteAddress()->asStringUriOnly()), call
+      ::Utils::coreStringToAppString(call->getRemoteAddress()->asStringUriOnly()), call
     );
 }
 
@@ -332,7 +332,7 @@ void SipAddressesModel::handleAllEntriesRemoved (const QString &sipAddress) {
 
 void SipAddressesModel::handleMessageSent (const shared_ptr<linphone::ChatMessage> &message) {
   addOrUpdateSipAddress(
-    ::Utils::linphoneStringToQString(message->getToAddress()->asStringUriOnly()),
+    ::Utils::coreStringToAppString(message->getToAddress()->asStringUriOnly()),
     message
   );
 }
@@ -448,7 +448,7 @@ void SipAddressesModel::initSipAddresses () {
     if (history.size() == 0)
       continue;
 
-    QString sipAddress = ::Utils::linphoneStringToQString(chatRoom->getPeerAddress()->asStringUriOnly());
+    QString sipAddress = ::Utils::coreStringToAppString(chatRoom->getPeerAddress()->asStringUriOnly());
 
     QVariantMap map;
     map["sipAddress"] = sipAddress;
@@ -461,7 +461,7 @@ void SipAddressesModel::initSipAddresses () {
   // Get sip addresses from calls.
   QSet<QString> addressDone;
   for (const auto &callLog : core->getCallLogs()) {
-    const QString &sipAddress = ::Utils::linphoneStringToQString(callLog->getRemoteAddress()->asStringUriOnly());
+    const QString &sipAddress = ::Utils::coreStringToAppString(callLog->getRemoteAddress()->asStringUriOnly());
 
     if (addressDone.contains(sipAddress))
       continue; // Already used.