diff --git a/linphone-desktop/resources.qrc b/linphone-desktop/resources.qrc
index 18fac771a..89d419a28 100644
--- a/linphone-desktop/resources.qrc
+++ b/linphone-desktop/resources.qrc
@@ -265,6 +265,7 @@
     <file>ui/modules/Common/Window/Window.qml</file>
     <file>ui/modules/Linphone/Account/AccountStatus.qml</file>
     <file>ui/modules/Linphone/Calls/CallControls.qml</file>
+    <file>ui/modules/Linphone/Calls/Calls.js</file>
     <file>ui/modules/Linphone/Calls/Calls.qml</file>
     <file>ui/modules/Linphone/CardBlock.qml</file>
     <file>ui/modules/Linphone/Chat/Chat.js</file>
diff --git a/linphone-desktop/src/app/object-builders/AsyncObjectBuilder.cpp b/linphone-desktop/src/app/object-builders/AsyncObjectBuilder.cpp
index d7562a2d6..5dbb86c29 100644
--- a/linphone-desktop/src/app/object-builders/AsyncObjectBuilder.cpp
+++ b/linphone-desktop/src/app/object-builders/AsyncObjectBuilder.cpp
@@ -92,6 +92,9 @@ void AsyncObjectBuilder::createObject (QQmlEngine *engine, const char *path, Dec
   #ifdef QT_DEBUG
     Q_ASSERT(!m_block_creation);
     m_block_creation = true;
+
+    Q_ASSERT(engine != nullptr);
+    Q_ASSERT(path != nullptr);
   #endif // ifdef QT_DEBUG
 
   m_component = new QQmlComponent(engine, QUrl(path), QQmlComponent::Asynchronous, this);
diff --git a/linphone-desktop/ui/modules/Linphone/Calls/CallControls.qml b/linphone-desktop/ui/modules/Linphone/Calls/CallControls.qml
index 27753d981..474551d54 100644
--- a/linphone-desktop/ui/modules/Linphone/Calls/CallControls.qml
+++ b/linphone-desktop/ui/modules/Linphone/Calls/CallControls.qml
@@ -21,10 +21,6 @@ Rectangle {
 
   // ---------------------------------------------------------------------------
 
-  property var _sipAddressObserver: SipAddressesModel.getSipAddressObserver(sipAddress)
-
-  // ---------------------------------------------------------------------------
-
   signal clicked
 
   // ---------------------------------------------------------------------------
@@ -56,10 +52,7 @@ Rectangle {
 
       displayUnreadMessagesCount: true
 
-      entry: ({
-        contact: _sipAddressObserver.contact,
-        sipAddress: callControls.sipAddress
-      })
+      entry: SipAddressesModel.getSipAddressObserver(sipAddress)
     }
 
     Item {
diff --git a/linphone-desktop/ui/modules/Linphone/Calls/Calls.js b/linphone-desktop/ui/modules/Linphone/Calls/Calls.js
new file mode 100644
index 000000000..367177c67
--- /dev/null
+++ b/linphone-desktop/ui/modules/Linphone/Calls/Calls.js
@@ -0,0 +1,148 @@
+// =============================================================================
+// `Calls.qml` Logic.
+// =============================================================================
+
+.import Linphone 1.0 as Linphone
+
+// =============================================================================
+
+var MAP_STATUS_TO_PARAMS = (function () {
+  var CallModel = Linphone.CallModel
+  var map = {}
+
+  map[CallModel.CallStatusConnected] = (function (call) {
+    return {
+      actions: [{
+        handler: (function () { call.pausedByUser = true }),
+        name: qsTr('pauseCall')
+      }, {
+        handler: (function () { call.transfer() }),
+        name: qsTr('transferCall')
+      }, {
+        handler: (function () { call.terminate() }),
+        name: qsTr('terminateCall')
+      }],
+      component: callActions,
+      string: 'connected'
+    }
+  })
+
+  map[CallModel.CallStatusEnded] = (function (call) {
+    return {
+      string: 'ended'
+    }
+  })
+
+  map[CallModel.CallStatusIncoming] = (function (call) {
+    return {
+      actions: [{
+        name: qsTr('acceptAudioCall'),
+        handler: (function () { call.accept() })
+      }, {
+        name: qsTr('acceptVideoCall'),
+        handler: (function () { call.acceptWithVideo() })
+      }, {
+        name: qsTr('terminateCall'),
+        handler: (function () { call.terminate() })
+      }],
+      component: callActions,
+      string: 'incoming'
+    }
+  })
+
+  map[CallModel.CallStatusOutgoing] = (function (call) {
+    return {
+      component: callAction,
+      handler: (function () { call.terminate() }),
+      icon: 'hangup',
+      string: 'outgoing'
+    }
+  })
+
+  map[CallModel.CallStatusPaused] = (function (call) {
+    return {
+      actions: [(call.pausedByUser ? {
+        handler: (function () { call.pausedByUser = false }),
+        name: qsTr('resumeCall')
+      } : {
+        handler: (function () { call.pausedByUser = true }),
+        name: qsTr('pauseCall')
+      }), {
+        handler: (function () { call.transfer() }),
+        name: qsTr('transferCall')
+      }, {
+        handler: (function () { call.terminate() }),
+        name: qsTr('terminateCall')
+      }],
+      component: callActions,
+      string: 'paused'
+    }
+  })
+
+  return map;
+})()
+
+// -----------------------------------------------------------------------------
+
+function getParams (call) {
+  if (call) {
+    return MAP_STATUS_TO_PARAMS[call.status](call)
+  }
+}
+
+// -----------------------------------------------------------------------------
+
+function handleCallRunning (index, call) {
+  calls.currentIndex = index
+  calls._selectedCall = call
+}
+
+function handleRowsAboutToBeRemoved (_, first, last) {
+  var index = calls.currentIndex
+
+  if (index >= first && index <= last) { // Remove current call.
+    var model = calls.model
+
+    if (model.rowCount() - (last - first + 1) <= 0) {
+      calls._selectedCall = null
+    } else {
+      if (first === 0) {
+        calls._selectedCall = model.data(model.index(last + 1, 0))
+      } else {
+        calls._selectedCall = model.data(model.index(0, 0))
+      }
+    }
+  }
+}
+
+function handleRowsRemoved (_, first, last) {
+  var index = calls.currentIndex
+
+  // The current call has been removed.
+  if (index >= first && index <= last) {
+    if (calls.model.rowCount() === 0) {
+      calls.currentIndex = -1 // No calls.
+    } else {
+      calls.currentIndex = 0 // The first call becomes the selected call.
+    }
+  }
+
+  // Update the current index of the selected call if it was after the removed calls.
+  else if (last < index) {
+    calls.currentIndex = index - (last - first + 1)
+  }
+}
+
+function handleRowsInserted (_, first, last) {
+  // The last inserted outgoing element become the selected call.
+  var model = calls.model
+
+  for (var index = last; index >= first; index--) {
+    var call = model.data(model.index(index, 0))
+
+    if (call.isOutgoing) {
+      calls.currentIndex = first
+      calls._selectedCall = model.data(model.index(first, 0))
+    }
+  }
+}
diff --git a/linphone-desktop/ui/modules/Linphone/Calls/Calls.qml b/linphone-desktop/ui/modules/Linphone/Calls/Calls.qml
index c894b306e..755000086 100644
--- a/linphone-desktop/ui/modules/Linphone/Calls/Calls.qml
+++ b/linphone-desktop/ui/modules/Linphone/Calls/Calls.qml
@@ -4,6 +4,8 @@ import Common 1.0
 import Linphone 1.0
 import Linphone.Styles 1.0
 
+import 'Calls.js' as Logic
+
 // =============================================================================
 
 ListView {
@@ -13,153 +15,23 @@ ListView {
 
   readonly property var selectedCall: _selectedCall
 
-  property var _mapStatusToParams
   property var _selectedCall
 
   // ---------------------------------------------------------------------------
 
-  function _getParams (call) {
-    if (call) {
-      return _mapStatusToParams[call.status](call)
-    }
-  }
-
-  // ---------------------------------------------------------------------------
-
   boundsBehavior: Flickable.StopAtBounds
   clip: true
   spacing: 0
 
   // ---------------------------------------------------------------------------
 
-  Component.onCompleted: {
-    _mapStatusToParams = {}
-
-    _mapStatusToParams[CallModel.CallStatusConnected] = (function (call) {
-      return {
-        actions: [{
-          handler: (function () { call.pausedByUser = true }),
-          name: qsTr('pauseCall')
-        }, {
-          handler: (function () { call.transfer() }),
-          name: qsTr('transferCall')
-        }, {
-          handler: (function () { call.terminate() }),
-          name: qsTr('terminateCall')
-        }],
-        component: callActions,
-        string: 'connected'
-      }
-    })
-
-    _mapStatusToParams[CallModel.CallStatusEnded] = (function (call) {
-      return {
-        string: 'ended'
-      }
-    })
-
-    _mapStatusToParams[CallModel.CallStatusIncoming] = (function (call) {
-      return {
-        actions: [{
-          name: qsTr('acceptAudioCall'),
-          handler: (function () { call.accept() })
-        }, {
-          name: qsTr('acceptVideoCall'),
-          handler: (function () { call.acceptWithVideo() })
-        }, {
-          name: qsTr('terminateCall'),
-          handler: (function () { call.terminate() })
-        }],
-        component: callActions,
-        string: 'incoming'
-      }
-    })
-
-    _mapStatusToParams[CallModel.CallStatusOutgoing] = (function (call) {
-      return {
-        component: callAction,
-        handler: (function () { call.terminate() }),
-        icon: 'hangup',
-        string: 'outgoing'
-      }
-    })
-
-    _mapStatusToParams[CallModel.CallStatusPaused] = (function (call) {
-      return {
-        actions: [(call.pausedByUser ? {
-          handler: (function () { call.pausedByUser = false }),
-          name: qsTr('resumeCall')
-        } : {
-          handler: (function () { call.pausedByUser = true }),
-          name: qsTr('pauseCall')
-        }), {
-          handler: (function () { call.transfer() }),
-          name: qsTr('transferCall')
-        }, {
-          handler: (function () { call.terminate() }),
-          name: qsTr('terminateCall')
-        }],
-        component: callActions,
-        string: 'paused'
-      }
-    })
-  }
-
-  // ---------------------------------------------------------------------------
-
   Connections {
     target: model
 
-    onRowsAboutToBeRemoved: {
-      var index = calls.currentIndex
-
-      if (index >= first && index <= last) { // Remove current call.
-        if (model.rowCount() - (last - first + 1) <= 0) {
-          _selectedCall = null
-        } else {
-          if (first === 0) {
-            _selectedCall = model.data(model.index(last + 1, 0))
-          } else {
-            _selectedCall = model.data(model.index(0, 0))
-          }
-        }
-      }
-    }
-
-    onRowsRemoved: {
-      var index = calls.currentIndex
-
-      // The current call has been removed.
-      if (index >= first && index <= last) {
-        if (model.rowCount() === 0) {
-          calls.currentIndex = -1 // No calls.
-        } else {
-          calls.currentIndex = 0 // The first call becomes the selected call.
-        }
-      }
-
-      // Update the current index of the selected call if it was after the removed calls.
-      else if (last < index) {
-        calls.currentIndex = index - (last - first + 1)
-      }
-    }
-
-    // The last inserted outgoing element become the selected call.
-    onRowsInserted: {
-      for (var index = last; index >= first; index--) {
-        var call = model.data(model.index(index, 0))
-
-        if (call.isOutgoing) {
-          calls.currentIndex = first
-          _selectedCall = model.data(model.index(first, 0))
-        }
-      }
-    }
-
-    onCallRunning: {
-      calls.currentIndex = index
-      _selectedCall = call
-    }
+    onCallRunning: Logic.handleCallRunning(index, call)
+    onRowsAboutToBeRemoved: Logic.handleRowsAboutToBeRemoved(parent, first, last)
+    onRowsInserted: Logic.handleRowsInserted(parent, first, last)
+    onRowsRemoved: Logic.handleRowsRemoved(parent, first, last)
   }
 
   // ---------------------------------------------------------------------------
@@ -260,10 +132,11 @@ ListView {
     Loader {
       id: loader
 
-      property int callId: index
-      property var call: $call
-      property var callControls: _callControls
-      property var params: _getParams($call)
+      readonly property int callId: index
+
+      readonly property var call: $call
+      readonly property var callControls: _callControls
+      readonly property var params: Logic.getParams($call)
 
       anchors.centerIn: parent
       sourceComponent: params.component
diff --git a/linphone-desktop/ui/modules/Linphone/Notifications/NotificationReceivedCall.qml b/linphone-desktop/ui/modules/Linphone/Notifications/NotificationReceivedCall.qml
index 31b7f3172..c1b3c0501 100644
--- a/linphone-desktop/ui/modules/Linphone/Notifications/NotificationReceivedCall.qml
+++ b/linphone-desktop/ui/modules/Linphone/Notifications/NotificationReceivedCall.qml
@@ -13,8 +13,6 @@ Notification {
   // ---------------------------------------------------------------------------
 
   property var _call: notificationData && notificationData.call
-  property var _contact: _sipAddressObserver.contact
-  property var _sipAddressObserver: SipAddressesModel.getSipAddressObserver(_call ? _call.sipAddress : '')
 
   // ---------------------------------------------------------------------------
 
@@ -49,10 +47,10 @@ Notification {
         Contact {
           Layout.fillWidth: true
 
-          entry: ({
-            contact: notification._contact,
-            sipAddress: notification._sipAddressObserver.sipAddress
-          })
+          entry: {
+            var call = notification._call
+            return SipAddressesModel.getSipAddressObserver(call ? call.sipAddress : '')
+          }
         }
 
         // ---------------------------------------------------------------------
diff --git a/linphone-desktop/ui/modules/Linphone/Notifications/NotificationReceivedMessage.qml b/linphone-desktop/ui/modules/Linphone/Notifications/NotificationReceivedMessage.qml
index 6d182c3f8..2678868cf 100644
--- a/linphone-desktop/ui/modules/Linphone/Notifications/NotificationReceivedMessage.qml
+++ b/linphone-desktop/ui/modules/Linphone/Notifications/NotificationReceivedMessage.qml
@@ -13,8 +13,6 @@ Notification {
   // ---------------------------------------------------------------------------
 
   property string _sipAddress: notificationData && notificationData.sipAddress || ''
-  property var _contact: _sipAddressObserver.contact
-  property var _sipAddressObserver: SipAddressesModel.getSipAddressObserver(_sipAddress)
 
   // ---------------------------------------------------------------------------
 
@@ -49,10 +47,7 @@ Notification {
         Contact {
           Layout.fillWidth: true
 
-          entry: ({
-            contact: notification._contact,
-            sipAddress: notification._sipAddress
-          })
+          entry: SipAddressesModel.getSipAddressObserver(notification._sipAddress)
         }
 
         Rectangle {
diff --git a/linphone-desktop/ui/modules/Linphone/SmartSearchBar.qml b/linphone-desktop/ui/modules/Linphone/SmartSearchBar.qml
index 9e55bdf11..99372595f 100644
--- a/linphone-desktop/ui/modules/Linphone/SmartSearchBar.qml
+++ b/linphone-desktop/ui/modules/Linphone/SmartSearchBar.qml
@@ -77,6 +77,7 @@ SearchBox {
 
               Layout.fillHeight: true
               Layout.fillWidth: true
+
               entry: ({
                 sipAddress: interpretableSipAddress
               })