diff --git a/app/src/main/java/org/linphone/ui/call/fragment/CallsListFragment.kt b/app/src/main/java/org/linphone/ui/call/fragment/CallsListFragment.kt
index 4edac46e2..793243747 100644
--- a/app/src/main/java/org/linphone/ui/call/fragment/CallsListFragment.kt
+++ b/app/src/main/java/org/linphone/ui/call/fragment/CallsListFragment.kt
@@ -31,6 +31,8 @@ import org.linphone.core.tools.Log
 import org.linphone.databinding.CallsListFragmentBinding
 import org.linphone.ui.call.adapter.CallsListAdapter
 import org.linphone.ui.call.viewmodel.CallsViewModel
+import org.linphone.ui.main.history.model.ConfirmationDialogModel
+import org.linphone.utils.DialogUtils
 
 class CallsListFragment : GenericCallFragment() {
     companion object {
@@ -99,7 +101,7 @@ class CallsListFragment : GenericCallFragment() {
         }
 
         binding.setMergeCallsClickListener {
-            viewModel.mergeCallsIntoConference()
+            showMergeCallsIntoConferenceConfirmationDialog()
         }
 
         viewModel.calls.observe(viewLifecycleOwner) {
@@ -114,4 +116,27 @@ class CallsListFragment : GenericCallFragment() {
         bottomSheetDialog?.dismiss()
         bottomSheetDialog = null
     }
+
+    private fun showMergeCallsIntoConferenceConfirmationDialog() {
+        val model = ConfirmationDialogModel()
+        val dialog = DialogUtils.getConfirmMergeCallsDialog(
+            requireActivity(),
+            model
+        )
+
+        model.dismissEvent.observe(viewLifecycleOwner) {
+            it.consume {
+                dialog.dismiss()
+            }
+        }
+
+        model.confirmEvent.observe(viewLifecycleOwner) {
+            it.consume {
+                viewModel.mergeCallsIntoConference()
+                dialog.dismiss()
+            }
+        }
+
+        dialog.show()
+    }
 }
diff --git a/app/src/main/java/org/linphone/ui/call/viewmodel/CallsViewModel.kt b/app/src/main/java/org/linphone/ui/call/viewmodel/CallsViewModel.kt
index 774de120c..460959c73 100644
--- a/app/src/main/java/org/linphone/ui/call/viewmodel/CallsViewModel.kt
+++ b/app/src/main/java/org/linphone/ui/call/viewmodel/CallsViewModel.kt
@@ -216,7 +216,24 @@ class CallsViewModel @UiThread constructor() : ViewModel() {
 
     @UiThread
     fun mergeCallsIntoConference() {
-        // TODO FIXME: implement local conferences merge
+        coreContext.postOnCoreThread { core ->
+            val callsCount = core.callsNb
+            val defaultAccount = LinphoneUtils.getDefaultAccount()
+            val subject = if (defaultAccount != null && defaultAccount.params.audioVideoConferenceFactoryAddress != null) {
+                Log.i("$TAG Merging [$callsCount] calls into a remotely hosted conference")
+                AppUtils.getString(R.string.conference_remotely_hosted_title)
+            } else {
+                Log.i("$TAG Merging [$callsCount] calls into a locally hosted conference")
+                AppUtils.getString(R.string.conference_locally_hosted_title)
+            }
+
+            val params = core.createConferenceParams(null)
+            params.subject = subject
+            // Prevent group call to start in audio only layout
+            params.isVideoEnabled = true
+            val conference = core.createConferenceWithParams(params)
+            conference?.addParticipants(core.calls)
+        }
     }
 
     @WorkerThread
diff --git a/app/src/main/java/org/linphone/utils/DialogUtils.kt b/app/src/main/java/org/linphone/utils/DialogUtils.kt
index 4eba289db..ccbb601da 100644
--- a/app/src/main/java/org/linphone/utils/DialogUtils.kt
+++ b/app/src/main/java/org/linphone/utils/DialogUtils.kt
@@ -42,6 +42,7 @@ import org.linphone.databinding.DialogContactConfirmTrustCallBinding
 import org.linphone.databinding.DialogContactTrustProcessBinding
 import org.linphone.databinding.DialogDeleteContactBinding
 import org.linphone.databinding.DialogManageAccountInternationalPrefixHelpBinding
+import org.linphone.databinding.DialogMergeCallsIntoConferenceBinding
 import org.linphone.databinding.DialogPickNumberOrAddressBinding
 import org.linphone.databinding.DialogRemoveAccountBinding
 import org.linphone.databinding.DialogRemoveAllCallLogsBinding
@@ -338,6 +339,22 @@ class DialogUtils {
             return getDialog(context, binding)
         }
 
+        @UiThread
+        fun getConfirmMergeCallsDialog(
+            context: Context,
+            viewModel: ConfirmationDialogModel
+        ): Dialog {
+            val binding: DialogMergeCallsIntoConferenceBinding = DataBindingUtil.inflate(
+                LayoutInflater.from(context),
+                R.layout.dialog_merge_calls_into_conference,
+                null,
+                false
+            )
+            binding.viewModel = viewModel
+
+            return getDialog(context, binding)
+        }
+
         @UiThread
         fun getCancelMeetingDialog(
             context: Context,
diff --git a/app/src/main/res/layout/dialog_merge_calls_into_conference.xml b/app/src/main/res/layout/dialog_merge_calls_into_conference.xml
new file mode 100644
index 000000000..0c8ea1ec0
--- /dev/null
+++ b/app/src/main/res/layout/dialog_merge_calls_into_conference.xml
@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <data>
+        <import type="android.view.View" />
+        <import type="android.graphics.Typeface" />
+        <variable
+            name="viewModel"
+            type="org.linphone.ui.main.history.model.ConfirmationDialogModel" />
+    </data>
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:onClick="@{() -> viewModel.dismiss()}"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <ImageView
+            android:id="@+id/dialog_background"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:layout_marginStart="12dp"
+            android:layout_marginEnd="12dp"
+            android:layout_marginBottom="2dp"
+            android:src="@drawable/shape_dialog_background"
+            app:layout_constraintWidth_max="@dimen/dialog_max_width"
+            app:layout_constraintBottom_toBottomOf="@id/anchor"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="@id/title" />
+
+        <androidx.appcompat.widget.AppCompatTextView
+            style="@style/section_header_style"
+            android:id="@+id/title"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="15dp"
+            android:paddingTop="@dimen/dialog_top_bottom_margin"
+            android:text="@string/calls_list_dialog_merge_into_conference_title"
+            app:layout_constraintVertical_chainStyle="packed"
+            app:layout_constraintBottom_toTopOf="@id/cancel"
+            app:layout_constraintStart_toStartOf="@id/dialog_background"
+            app:layout_constraintEnd_toEndOf="@id/dialog_background"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <androidx.appcompat.widget.AppCompatTextView
+            android:onClick="@{() -> viewModel.dismiss()}"
+            style="@style/secondary_button_label_style"
+            android:id="@+id/cancel"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="32dp"
+            android:layout_marginStart="15dp"
+            android:layout_marginEnd="15dp"
+            android:text="@string/dialog_cancel"
+            app:layout_constraintStart_toStartOf="@id/dialog_background"
+            app:layout_constraintEnd_toEndOf="@id/dialog_background"
+            app:layout_constraintTop_toBottomOf="@id/title"
+            app:layout_constraintBottom_toTopOf="@id/confirm"/>
+
+        <androidx.appcompat.widget.AppCompatTextView
+            android:onClick="@{() -> viewModel.confirm()}"
+            style="@style/primary_button_label_style"
+            android:id="@+id/confirm"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="16dp"
+            android:layout_marginStart="15dp"
+            android:layout_marginEnd="15dp"
+            android:text="@string/dialog_delete"
+            app:layout_constraintStart_toStartOf="@id/dialog_background"
+            app:layout_constraintEnd_toEndOf="@id/dialog_background"
+            app:layout_constraintTop_toBottomOf="@id/cancel"
+            app:layout_constraintBottom_toTopOf="@id/anchor"/>
+
+        <View
+            android:id="@+id/anchor"
+            android:layout_width="wrap_content"
+            android:layout_height="@dimen/dialog_top_bottom_margin"
+            app:layout_constraintTop_toBottomOf="@id/confirm"
+            app:layout_constraintStart_toStartOf="@id/dialog_background"
+            app:layout_constraintEnd_toEndOf="@id/dialog_background"
+            app:layout_constraintBottom_toBottomOf="parent"/>
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+</layout>
\ No newline at end of file
diff --git a/app/src/main/res/values-fr/strings.xml b/app/src/main/res/values-fr/strings.xml
index d98cda98b..488c9b08e 100644
--- a/app/src/main/res/values-fr/strings.xml
+++ b/app/src/main/res/values-fr/strings.xml
@@ -4,7 +4,8 @@
     <!ENTITY appName "Linphone">
 ]>
 
-<resources>
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Common words -->
     <string name="sip_address">Adresse SIP</string>
     <string name="sip_address_hint">utilisateur@domaine</string>
     <string name="sip_address_display_name">Nom d\'affichage</string>
@@ -19,11 +20,12 @@
     <string name="today">Aujourd\'hui</string>
     <string name="yesterday">Hier</string>
 
-    <plurals name="selection_count_label">
+    <plurals name="selection_count_label" tools:ignore="MissingQuantity">
         <item quantity="one">%s selectionné</item>
         <item quantity="other">%s selectionnés</item>
     </plurals>
 
+    <!-- Dialog various possible buttons label -->
     <string name="dialog_deny">Refuser</string>
     <string name="dialog_accept">Accepter</string>
     <string name="dialog_cancel">Annuler</string>
@@ -37,6 +39,7 @@
     <string name="dialog_no">Non</string>
     <string name="dialog_yes">Oui</string>
 
+    <!-- Related to Android notifications -->
     <string name="notification_channel_call_name">&appName; notifications d\'appels en cours</string>
     <string name="notification_channel_incoming_call_name">&appName; notifications d\'appels entrants</string>
     <string name="notification_channel_missed_call_name">&appName; notifications d\'appels manqués</string>
@@ -51,6 +54,7 @@
     <string name="notification_push_received_title">&appName;</string>
     <string name="notification_push_received_message">Recherche de nouveaux messages</string>
 
+    <!-- First screens user see when app is installed and started -->
     <string name="welcome_page_title">Bienvenue</string>
     <string name="welcome_page_subtitle">sur &appName;</string>
     <string name="welcome_page_1_message">Une application de communication <b>sécurisée</b>, <b>open source</b> et <b>française</b>.</string>
@@ -89,7 +93,7 @@
     <string name="toast_group_conversation_left">Vous avez quitté la conversation</string>
     <string name="toast_low_media_volume">Le volume media est bas, vous pourriez ne rien entendre !</string>
     <string name="toast_no_app_registered_to_handle_content_type_error">Aucune application trouvée pour lire ce fichier</string>
-    <plurals name="toast_files_waiting_to_be_shared">
+    <plurals name="toast_files_waiting_to_be_shared" tools:ignore="MissingQuantity">
         <item quantity="one">%s fichier en attente de partage</item>
         <item quantity="other">%s fichiers en attente de partage</item>
     </plurals>
@@ -99,6 +103,7 @@
     <string name="toast_call_transfer_successful">L\'appel a été transferré</string>
     <string name="toast_call_transfer_failed">Le transfert a échoué !</string>
 
+    <!-- Assistant related string (account register / login / etc...) -->
     <string name="assistant_dialog_general_terms_and_privacy_policy_title">Conditions de service &amp; politique de confidentialité</string>
     <string name="assistant_dialog_general_terms_and_privacy_policy_message">blah blah blah</string> <!-- TODO FIXME -->
     <string name="assistant_dialog_confirm_phone_number_title">Confirmez votre numéro de téléphone</string>
@@ -151,11 +156,13 @@
     <string name="assistant_permissions_record_audio_title"><b>Microphone :</b> Pour permettre à vos correspondants de vous entendre. </string>
     <string name="assistant_permissions_access_camera_title"><b>Caméra :</b> Pour capturer votre vidéo lors des appels et des conférences.</string>
 
+    <!-- Main navigation items -->
     <string name="bottom_navigation_contacts_label">Contacts</string>
     <string name="bottom_navigation_calls_label">Appels</string>
     <string name="bottom_navigation_conversations_label">Conversations</string>
     <string name="bottom_navigation_meetings_label">Réunions</string>
 
+    <!-- Side menu -->
     <string name="drawer_menu_manage_account">Paramètres du profil</string>
     <string name="drawer_menu_account_connection_status_connected">Connecté</string>
     <string name="drawer_menu_account_connection_status_refreshing">En cours de rafraîchissement…</string>
@@ -165,6 +172,7 @@
     <string name="drawer_menu_no_account_configured_yet">Aucun compte configuré</string>
     <string name="drawer_menu_add_account">Ajouter un compte</string>
 
+    <!-- Help & troubleshooting related -->
     <string name="help_title">Aide</string>
     <string name="help_about_title">À propos de &appName;</string>
     <string name="help_about_privacy_policy_title">Politique de confidentialité</string>
@@ -189,6 +197,7 @@
     <string name="help_troubleshooting_debug_logs_upload_error_toast_message">Echec à l\'envoi des journaux</string>
     <string name="help_troubleshooting_show_config_file">Afficher la configuration</string>
 
+    <!-- App & SDK settings -->
     <string name="settings_title">Paramètres</string>
     <string name="settings_security_title">Securité</string>
     <string name="settings_security_enable_vfs_title">Chiffrer tous les fichiers</string>
@@ -245,6 +254,7 @@
     <string name="settings_user_interface_auto_theme_label">Auto</string>
     <string name="settings_advanced_title">Paramètres avancés</string>
 
+    <!-- Account profile & settings -->
     <string name="manage_account_title">Votre compte</string>
     <string name="manage_account_details_title">Détails</string>
     <string name="manage_account_devices_title">Appareils</string>
@@ -307,6 +317,7 @@
     <string name="history_dialog_delete_call_logs_title">Voulez-vous supprimer tout les appels avec cette personne ?</string>
     <string name="history_dialog_delete_call_logs_message">TOut l\'historique d\'appel avec cette personne sera supprimmé.</string>
 
+    <!-- Contacts -->
     <string name="contacts_list_empty">Aucun contact pour le moment…</string>
     <string name="contacts_list_favourites_title">Favoris</string>
     <string name="contacts_list_all_contacts_title">Tous les contacts</string>
@@ -362,6 +373,7 @@
     <string name="contact_make_call_check_device_trust">Vérifier</string>
     <string name="contact_device_without_name">Appareil sans nom</string>
 
+    <!-- Chat -->
     <string name="conversations_list_empty">Aucune conversation pour le moment…</string>
     <string name="conversations_list_is_being_removed_label">En cours de suppression…</string>
     <string name="conversations_last_message_format">%s :</string>
@@ -388,7 +400,7 @@
     <string name="new_conversation_no_matching_contact">Aucun résultat trouvé…</string>
     <string name="new_conversation_group_name_title">Nom du groupe</string>
     <string name="conversation_text_field_hint">Dites quelque chose…</string>
-    <plurals name="conversation_composing_label">
+    <plurals name="conversation_composing_label" tools:ignore="MissingQuantity">
         <item quantity="one">%s est en train d\'écrire…</item>
         <item quantity="other">%s sont en train d\'écrire…</item>
     </plurals>
@@ -450,6 +462,7 @@
     <string name="message_reaction_click_to_remove_label">Cliquez pour supprimer</string>
     <string name="message_forwarded_label">Transféré</string>
 
+    <!-- Scheduled conferences -->
     <string name="meetings_list_empty">Aucune réunion pour le moment…</string>
     <string name="meetings_list_today_indicator">Aujourd\'hui</string>
 
@@ -488,6 +501,7 @@
     <string name="meeting_waiting_room_joining_title">Connexion à la réunion</string>
     <string name="meeting_waiting_room_joining_subtitle">Vous allez rejoindre la réunion dans quelques instants…</string>
 
+    <!-- Call related -->
     <string name="call_outgoing">Appel sortant</string>
     <string name="call_incoming">Appel entrant</string>
     <string name="call_ended">Appel terminé</string>
@@ -520,6 +534,7 @@
     <string name="call_remote_is_recording">%s est en train d\'enregistrer</string>
     <string name="calls_count_label">%s appels</string>
     <string name="calls_paused_count_label">%s appels en pause</string>
+    <string name="calls_list_dialog_merge_into_conference_title">Fusionner les appels en une conférence ?</string>
 
     <string name="call_dialog_zrtp_validate_trust_title">Valider l\'appareil</string>
     <string name="call_dialog_zrtp_validate_trust_subtitle">Dites %s puis cliquez sur les lettres données par votre correspondant :</string>
@@ -549,11 +564,12 @@
     <string name="call_stats_zrtp_auth_tag_algo">Algorithme d\'authentification : %s</string>
     <string name="call_stats_zrtp_sas_algo">Algorithm SAS: %s</string>
 
+    <!-- Conference (in-call) -->
     <string name="conference_share_link_title">Partager le lien</string>
     <string name="conference_call_empty">En attente d\'autres participants…</string>
     <string name="conference_action_screen_sharing">Partage d\'écran</string>
     <string name="conference_action_show_participants">Participants</string>
-    <plurals name="conference_participants_list_title">
+    <plurals name="conference_participants_list_title" tools:ignore="MissingQuantity">
         <item quantity="one">%s participant</item>
         <item quantity="other">%s participants</item>
     </plurals>
@@ -565,8 +581,13 @@
     <string name="conference_layout_active_speaker">Intervenant actif</string>
     <string name="conference_layout_audio_only">Audio uniquement</string>
 
+    <string name="conference_remotely_hosted_title">Appel de groupe distant</string>
+    <string name="conference_locally_hosted_title">Appel de groupe local</string>
+
+    <!-- Call records -->
     <string name="recordings_title">Enregistrements</string>
 
+    <!-- Various menu entries -->
     <string name="menu_add_address_to_contacts">Ajouter aux contacts</string>
     <string name="menu_see_existing_contact">Voir le contact</string>
     <string name="menu_copy_sip_address">Copier l\'adresse SIP</string>
@@ -579,6 +600,7 @@
     <string name="menu_forward_chat_message">Transférer</string>
     <string name="menu_copy_chat_message">Copier le texte</string>
 
+    <!-- Misc -->
     <string name="connection_error_for_non_default_account">Erreur de connexion au compte</string>
     <string name="network_not_reachable">Vous n\'êtes pas connecté à internet</string>
     <string name="operation_in_progress_overlay">Opération en cours, merci de patienter…</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 0812d7641..0342d6e7a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -489,7 +489,6 @@
     <string name="conversation_media_list_title">Shared media</string>
     <string name="conversation_document_list_title">Shared documents</string>
 
-    <!-- Scheduled conferences -->
     <string name="message_delivery_info_read_title">Read %s</string>
     <string name="message_delivery_info_received_title">Received %s</string>
     <string name="message_delivery_info_sent_title">Sent %s</string>
@@ -499,6 +498,7 @@
     <string name="message_reaction_click_to_remove_label">Click to remove</string>
     <string name="message_forwarded_label">Forwarded</string>
 
+    <!-- Scheduled conferences -->
     <string name="meetings_list_empty">No meeting for the moment…</string>
     <string name="meetings_list_today_indicator">Today</string>
 
@@ -570,6 +570,7 @@
     <string name="call_remote_is_recording">%s is recording</string>
     <string name="calls_count_label">%s calls</string>
     <string name="calls_paused_count_label">%s paused calls</string>
+    <string name="calls_list_dialog_merge_into_conference_title">Merge all calls into conference?</string>
 
     <string name="call_dialog_zrtp_validate_trust_title">Validate the device</string>
     <string name="call_dialog_zrtp_validate_trust_subtitle">Say %s and click on the letters given by your correspondent:</string>
@@ -616,6 +617,9 @@
     <string name="conference_layout_active_speaker">Speaker</string>
     <string name="conference_layout_audio_only">Audio only</string>
 
+    <string name="conference_remotely_hosted_title">Remote group call</string>
+    <string name="conference_locally_hosted_title">Local group call</string>
+
     <!-- Call records -->
     <string name="recordings_title">Recordings</string>