Use self managed telecom manager mode for Android 8+

CHANGELOG.md

@@ -16,6 +16,7 @@ Group changes to describe their impact on the project, as follows:
 - Reply to chat message feature (with original message preview)
 - Voice recordings in chat feature
 - Allow video recording in chat file sharing
+- Notify incoming/outgoing calls on bluetooth devices using self-managed connections from telecom manager API
 - New video call UI on foldable device like Galaxy Z Fold
 - Setting to automatically record all calls
 

app/src/main/AndroidManifest.xml

@@ -5,7 +5,7 @@
     <uses-permission android:name="android.permission.READ_CONTACTS" />
     <uses-permission android:name="android.permission.WRITE_CONTACTS" />
 
-    <!-- Helps filling phone number and country code in assistant -->
+    <!-- Helps filling phone number and country code in assistant & for Telecom Manager -->
     <uses-permission android:name="android.permission.READ_PHONE_STATE" />
 
     <!-- Needed for auto start at boot and to ensure the service won't be killed by OS while in call -->
@@ -25,6 +25,9 @@
     <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" />
     <uses-permission android:name="android.permission.GET_ACCOUNTS" />
 
+    <!-- Needed for Telecom Manager -->
+    <uses-permission android:name="android.permission.MANAGE_OWN_CALLS"/>
+
     <!-- Needed for overlay -->
     <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
 
@@ -176,6 +179,14 @@
                 android:resource="@xml/authenticator" />
         </service>
 
+        <service android:name=".telecom.TelecomConnectionService"
+            android:permission="android.permission.BIND_TELECOM_CONNECTION_SERVICE"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.telecom.ConnectionService" />
+            </intent-filter>
+        </service>
+
         <!-- Receivers -->
 
         <receiver android:name=".core.CorePushReceiver"

app/src/main/java/org/linphone/activities/main/settings/fragments/CallSettingsFragment.kt

@@ -19,20 +19,26 @@
  */
 package org.linphone.activities.main.settings.fragments
 
+import android.Manifest
 import android.content.Intent
+import android.content.pm.PackageManager
 import android.net.Uri
 import android.os.Build
 import android.os.Bundle
 import android.provider.Settings
 import android.view.View
 import androidx.lifecycle.ViewModelProvider
+import org.linphone.LinphoneApplication.Companion.corePreferences
 import org.linphone.R
 import org.linphone.activities.main.settings.viewmodels.CallSettingsViewModel
 import org.linphone.activities.navigateToEmptySetting
 import org.linphone.compatibility.Compatibility
+import org.linphone.core.tools.Log
 import org.linphone.databinding.SettingsCallFragmentBinding
 import org.linphone.mediastream.Version
+import org.linphone.telecom.TelecomHelper
 import org.linphone.utils.Event
+import org.linphone.utils.PermissionHelper
 
 class CallSettingsFragment : GenericSettingFragment<SettingsCallFragmentBinding>() {
     private lateinit var viewModel: CallSettingsViewModel
@@ -83,16 +89,75 @@ class CallSettingsFragment : GenericSettingFragment<SettingsCallFragmentBinding>
                 }
             }
         )
+
+        viewModel.enableTelecomManagerEvent.observe(
+            viewLifecycleOwner,
+            {
+                it.consume {
+                    if (!PermissionHelper.get().hasTelecomManagerPermissions()) {
+                        val permissions = arrayOf(
+                            Manifest.permission.READ_PHONE_STATE,
+                            Manifest.permission.MANAGE_OWN_CALLS
+                        )
+                        requestPermissions(permissions, 1)
+                    } else if (!TelecomHelper.exists()) {
+                        Log.w("[Telecom Helper] Doesn't exists yet, creating it")
+                        TelecomHelper.create(requireContext())
+                    }
+                }
+            }
+        )
+
+        viewModel.goToAndroidNotificationSettingsEvent.observe(
+            viewLifecycleOwner,
+            {
+                it.consume {
+                    if (Build.VERSION.SDK_INT >= Version.API26_O_80) {
+                        val i = Intent()
+                        i.action = Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS
+                        i.putExtra(Settings.EXTRA_APP_PACKAGE, requireContext().packageName)
+                        i.putExtra(
+                            Settings.EXTRA_CHANNEL_ID,
+                            getString(R.string.notification_channel_service_id)
+                        )
+                        i.addCategory(Intent.CATEGORY_DEFAULT)
+                        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                        i.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY)
+                        i.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS)
+                        startActivity(i)
+                    }
+                }
+            }
+        )
     }
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         super.onActivityResult(requestCode, resultCode, data)
 
-        if (!Compatibility.canDrawOverlay(requireContext())) {
-            viewModel.systemWideOverlayListener.onBoolValueChanged(false)
+        if (requestCode == 0 && !Compatibility.canDrawOverlay(requireContext())) {
+            viewModel.overlayListener.onBoolValueChanged(false)
+        } else if (requestCode == 1) {
+            if (!TelecomHelper.exists()) {
+                Log.w("[Telecom Helper] Doesn't exists yet, creating it")
+                TelecomHelper.create(requireContext())
+            }
+            updateTelecomManagerAccount()
         }
     }
 
+    private fun updateTelecomManagerAccount() {
+        if (!TelecomHelper.exists()) {
+            Log.e("[Telecom Helper] Doesn't exists, can't update account!")
+            return
+        }
+        // We have to refresh the account object otherwise isAccountEnabled will always return false...
+        val account = TelecomHelper.get().findExistingAccount(requireContext())
+        TelecomHelper.get().updateAccount(account)
+        val enabled = TelecomHelper.get().isAccountEnabled()
+        viewModel.useTelecomManager.value = enabled
+        corePreferences.useTelecomManager = enabled
+    }
+
     override fun goBack() {
         if (sharedViewModel.isSlidingPaneSlideable.value == true) {
             sharedViewModel.closeSlidingPaneEvent.value = Event(true)
@@ -100,4 +165,22 @@ class CallSettingsFragment : GenericSettingFragment<SettingsCallFragmentBinding>
             navigateToEmptySetting()
         }
     }
+
+    override fun onRequestPermissionsResult(
+        requestCode: Int,
+        permissions: Array<out String>,
+        grantResults: IntArray
+    ) {
+        for (index in grantResults.indices) {
+            val result = grantResults[index]
+            if (result != PackageManager.PERMISSION_GRANTED) {
+                Log.w("[Call Settings] ${permissions[index]} permission denied but required for telecom manager")
+                viewModel.useTelecomManager.value = false
+                corePreferences.useTelecomManager = false
+                return
+            }
+        }
+
+        TelecomHelper.create(requireContext())
+    }
 }

app/src/main/java/org/linphone/activities/main/settings/viewmodels/CallSettingsViewModel.kt

@@ -20,12 +20,13 @@
 package org.linphone.activities.main.settings.viewmodels
 
 import androidx.lifecycle.MutableLiveData
-import java.lang.NumberFormatException
 import org.linphone.R
 import org.linphone.activities.main.settings.SettingListenerStub
 import org.linphone.core.MediaEncryption
 import org.linphone.mediastream.Version
+import org.linphone.telecom.TelecomHelper
 import org.linphone.utils.Event
+import org.linphone.utils.PermissionHelper
 
 class CallSettingsViewModel : GenericSettingsViewModel() {
     val deviceRingtoneListener = object : SettingListenerStub() {
@@ -62,6 +63,28 @@ class CallSettingsViewModel : GenericSettingsViewModel() {
     }
     val encryptionMandatory = MutableLiveData<Boolean>()
 
+    val useTelecomManagerListener = object : SettingListenerStub() {
+        override fun onBoolValueChanged(newValue: Boolean) {
+            if (newValue &&
+                (
+                    !PermissionHelper.get().hasTelecomManagerPermissions() ||
+                        !TelecomHelper.exists() ||
+                        !TelecomHelper.get().isAccountEnabled()
+                    )
+            ) {
+                enableTelecomManagerEvent.value = Event(true)
+            } else {
+                if (!newValue && TelecomHelper.exists()) TelecomHelper.get().removeAccount()
+                prefs.useTelecomManager = newValue
+            }
+        }
+    }
+    val useTelecomManager = MutableLiveData<Boolean>()
+    val enableTelecomManagerEvent: MutableLiveData<Event<Boolean>> by lazy {
+        MutableLiveData<Event<Boolean>>()
+    }
+    val api26OrHigher = MutableLiveData<Boolean>()
+
     val fullScreenListener = object : SettingListenerStub() {
         override fun onBoolValueChanged(newValue: Boolean) {
             prefs.fullScreenCallUI = newValue
@@ -193,6 +216,9 @@ class CallSettingsViewModel : GenericSettingsViewModel() {
         initEncryptionList()
         encryptionMandatory.value = core.isMediaEncryptionMandatory
 
+        useTelecomManager.value = prefs.useTelecomManager
+        api26OrHigher.value = Version.sdkAboveOrEqual(Version.API26_O_80)
+
         fullScreen.value = prefs.fullScreenCallUI
         overlay.value = prefs.showCallOverlay
         systemWideOverlay.value = prefs.systemWideCallOverlay

app/src/main/java/org/linphone/core/CoreContext.kt

@@ -61,6 +61,7 @@ import org.linphone.contact.ContactsManager
 import org.linphone.core.tools.Log
 import org.linphone.mediastream.Version
 import org.linphone.notifications.NotificationsManager
+import org.linphone.telecom.TelecomHelper
 import org.linphone.utils.*
 import org.linphone.utils.Event
 
@@ -135,15 +136,17 @@ class CoreContext(val context: Context, coreConfig: Config) {
         ) {
             Log.i("[Context] Call state changed [$state]")
             if (state == Call.State.IncomingReceived || state == Call.State.IncomingEarlyMedia) {
-                var gsmCallActive = false
-                if (::phoneStateListener.isInitialized) {
-                    gsmCallActive = phoneStateListener.isInCall()
-                }
+                if (!corePreferences.useTelecomManager) {
+                    var gsmCallActive = false
+                    if (::phoneStateListener.isInitialized) {
+                        gsmCallActive = phoneStateListener.isInCall()
+                    }
 
-                if (gsmCallActive) {
-                    Log.w("[Context] Refusing the call with reason busy because a GSM call is active")
-                    call.decline(Reason.Busy)
-                    return
+                    if (gsmCallActive) {
+                        Log.w("[Context] Refusing the call with reason busy because a GSM call is active")
+                        call.decline(Reason.Busy)
+                        return
+                    }
                 }
 
                 // Starting SDK 24 (Android 7.0) we rely on the fullscreen intent of the call incoming notification
@@ -294,6 +297,11 @@ class CoreContext(val context: Context, coreConfig: Config) {
 
         notificationsManager.onCoreReady()
 
+        if (Version.sdkAboveOrEqual(Version.API26_O_80) && corePreferences.useTelecomManager) {
+            Log.i("[Context] Creating telecom helper")
+            TelecomHelper.create(context)
+        }
+
         core.addListener(listener)
 
         if (isPush) {
@@ -326,6 +334,10 @@ class CoreContext(val context: Context, coreConfig: Config) {
         }
         notificationsManager.destroy()
         contactsManager.destroy()
+        if (TelecomHelper.exists()) {
+            Log.i("[Context] Destroying telecom helper")
+            TelecomHelper.get().destroy()
+        }
 
         core.stop()
         core.removeListener(listener)

app/src/main/java/org/linphone/core/CorePreferences.kt

@@ -289,6 +289,13 @@ class CorePreferences constructor(private val context: Context) {
             config.setBool("app", "auto_start_call_record", value)
         }
 
+    var useTelecomManager: Boolean
+        // Some permissions are required, so keep it to false so user has to manually enable it and give permissions
+        get() = config.getBool("app", "use_self_managed_telecom_manager", false)
+        set(value) {
+            config.setBool("app", "use_self_managed_telecom_manager", value)
+        }
+
     var fullScreenCallUI: Boolean
         get() = config.getBool("app", "full_screen_call", true)
         set(value) {

app/src/main/java/org/linphone/telecom/NativeCallWrapper.kt

@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2010-2021 Belledonne Communications SARL.
+ *
+ * This file is part of linphone-android
+ * (see https://www.linphone.org).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.linphone.telecom
+
+import android.graphics.drawable.Icon
+import android.os.Bundle
+import android.telecom.CallAudioState
+import android.telecom.Connection
+import android.telecom.DisconnectCause
+import android.telecom.StatusHints
+import org.linphone.LinphoneApplication.Companion.coreContext
+import org.linphone.R
+import org.linphone.core.Call
+import org.linphone.core.tools.Log
+import org.linphone.utils.AudioRouteUtils
+
+class NativeCallWrapper(var callId: String) : Connection() {
+    init {
+        val capabilities = connectionCapabilities or CAPABILITY_MUTE or CAPABILITY_SUPPORT_HOLD or CAPABILITY_HOLD
+        connectionCapabilities = capabilities
+        audioModeIsVoip = true
+        statusHints = StatusHints(
+            "",
+            Icon.createWithResource(coreContext.context, R.drawable.linphone_logo_tinted),
+            Bundle()
+        )
+    }
+
+    override fun onStateChanged(state: Int) {
+        Log.i("[Connection] Telecom state changed [$state] for call with id: $callId")
+        super.onStateChanged(state)
+    }
+
+    override fun onAnswer(videoState: Int) {
+        Log.i("[Connection] Answering telecom call with id: $callId")
+        getCall()?.accept()
+    }
+
+    override fun onHold() {
+        Log.i("[Connection] Pausing telecom call with id: $callId")
+        getCall()?.pause()
+        setOnHold()
+    }
+
+    override fun onUnhold() {
+        Log.i("[Connection] Resuming telecom call with id: $callId")
+        getCall()?.resume()
+        setActive()
+    }
+
+    override fun onCallAudioStateChanged(state: CallAudioState) {
+        Log.i("[Connection] Audio state changed: $state")
+
+        val call = getCall()
+        call?.microphoneMuted = state.isMuted
+        when (state.route) {
+            CallAudioState.ROUTE_EARPIECE -> AudioRouteUtils.routeAudioToEarpiece(call)
+            CallAudioState.ROUTE_SPEAKER -> AudioRouteUtils.routeAudioToSpeaker(call)
+            CallAudioState.ROUTE_BLUETOOTH -> AudioRouteUtils.routeAudioToBluetooth(call)
+            CallAudioState.ROUTE_WIRED_HEADSET -> AudioRouteUtils.routeAudioToHeadset(call)
+        }
+    }
+
+    override fun onPlayDtmfTone(c: Char) {
+        Log.i("[Connection] Sending DTMF [$c] in telecom call with id: $callId")
+        getCall()?.sendDtmf(c)
+    }
+
+    override fun onDisconnect() {
+        Log.i("[Connection] Terminating telecom call with id: $callId")
+        getCall()?.terminate()
+    }
+
+    override fun onAbort() {
+        Log.i("[Connection] Aborting telecom call with id: $callId")
+        getCall()?.terminate()
+    }
+
+    override fun onReject() {
+        Log.i("[Connection] Rejecting telecom call with id: $callId")
+        setDisconnected(DisconnectCause(DisconnectCause.REJECTED))
+        getCall()?.terminate()
+    }
+
+    private fun getCall(): Call? {
+        return coreContext.core.getCallByCallid(callId)
+    }
+}

app/src/main/java/org/linphone/telecom/TelecomConnectionService.kt

@@ -0,0 +1,180 @@
+/*
+ * Copyright (c) 2010-2021 Belledonne Communications SARL.
+ *
+ * This file is part of linphone-android
+ * (see https://www.linphone.org).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.linphone.telecom
+
+import android.content.ComponentName
+import android.content.Intent
+import android.net.Uri
+import android.telecom.*
+import org.linphone.LinphoneApplication.Companion.coreContext
+import org.linphone.core.Call
+import org.linphone.core.Core
+import org.linphone.core.CoreListenerStub
+import org.linphone.core.tools.Log
+
+class TelecomConnectionService : ConnectionService() {
+    private val connections = arrayListOf<NativeCallWrapper>()
+
+    private val listener: CoreListenerStub = object : CoreListenerStub() {
+        override fun onCallStateChanged(
+            core: Core,
+            call: Call,
+            state: Call.State?,
+            message: String
+        ) {
+            Log.i("[Telecom Connection Service] call [${call.callLog.callId}] state changed: $state")
+            when (call.state) {
+                Call.State.OutgoingProgress -> {
+                    for (connection in connections) {
+                        if (connection.callId.isEmpty()) {
+                            connection.callId = core.currentCall?.callLog?.callId ?: ""
+                        }
+                    }
+                }
+                Call.State.End, Call.State.Released -> onCallEnded(call)
+                Call.State.Connected -> onCallConnected(call)
+            }
+        }
+    }
+
+    override fun onCreate() {
+        super.onCreate()
+
+        Log.i("[Telecom Connection Service] onCreate()")
+        coreContext.core.addListener(listener)
+    }
+
+    override fun onUnbind(intent: Intent?): Boolean {
+        Log.i("[Telecom Connection Service] onUnbind()")
+        coreContext.core.removeListener(listener)
+
+        return super.onUnbind(intent)
+    }
+
+    override fun onCreateOutgoingConnection(
+        connectionManagerPhoneAccount: PhoneAccountHandle,
+        request: ConnectionRequest
+    ): Connection {
+        val accountHandle = request.accountHandle
+        val componentName = ComponentName(applicationContext, this.javaClass)
+
+        return if (accountHandle != null && componentName == accountHandle.componentName) {
+            Log.i("[Telecom Connection Service] Creating outgoing connection")
+
+            val extras = request.extras
+            var callId = extras.getString("Call-ID")
+            val displayName = extras.getString("DisplayName")
+            if (callId == null) {
+                callId = coreContext.core.currentCall?.callLog?.callId ?: ""
+            }
+            Log.i("[Telecom Connection Service] Outgoing connection is for call [$callId] with display name [$displayName]")
+
+            // Prevents user dialing back from native dialer app history
+            if (callId.isEmpty() && displayName.isNullOrEmpty()) {
+                Log.e("[Telecom Connection Service] Looks like a call was made from native dialer history, aborting")
+                return Connection.createFailedConnection(DisconnectCause(DisconnectCause.OTHER))
+            }
+
+            val connection = NativeCallWrapper(callId)
+            connection.setDialing()
+
+            val providedHandle = request.address
+            connection.setAddress(providedHandle, TelecomManager.PRESENTATION_ALLOWED)
+            connection.setCallerDisplayName(displayName, TelecomManager.PRESENTATION_ALLOWED)
+            Log.i("[Telecom Connection Service] Address is $providedHandle")
+
+            connections.add(connection)
+            connection
+        } else {
+            Log.e("[Telecom Connection Service] Error: $accountHandle $componentName")
+            Connection.createFailedConnection(
+                DisconnectCause(
+                    DisconnectCause.ERROR,
+                    "Invalid inputs: $accountHandle $componentName"
+                )
+            )
+        }
+    }
+
+    override fun onCreateIncomingConnection(
+        connectionManagerPhoneAccount: PhoneAccountHandle,
+        request: ConnectionRequest
+    ): Connection {
+        val accountHandle = request.accountHandle
+        val componentName = ComponentName(applicationContext, this.javaClass)
+
+        return if (accountHandle != null && componentName == accountHandle.componentName) {
+            Log.i("[Telecom Connection Service] Creating incoming connection")
+
+            val extras = request.extras
+            val incomingExtras = extras.getBundle(TelecomManager.EXTRA_INCOMING_CALL_EXTRAS)
+            var callId = incomingExtras?.getString("Call-ID")
+            val displayName = incomingExtras?.getString("DisplayName")
+            if (callId == null) {
+                callId = coreContext.core.currentCall?.callLog?.callId ?: ""
+            }
+            Log.i("[Telecom Connection Service] Incoming connection is for call [$callId] with display name [$displayName]")
+
+            val connection = NativeCallWrapper(callId)
+            connection.setRinging()
+
+            val providedHandle =
+                incomingExtras?.getParcelable<Uri>(TelecomManager.EXTRA_INCOMING_CALL_ADDRESS)
+            connection.setAddress(providedHandle, TelecomManager.PRESENTATION_ALLOWED)
+            connection.setCallerDisplayName(displayName, TelecomManager.PRESENTATION_ALLOWED)
+            Log.i("[Telecom Connection Service] Address is $providedHandle")
+
+            connections.add(connection)
+            connection
+        } else {
+            Log.e("[Telecom Connection Service] Error: $accountHandle $componentName")
+            Connection.createFailedConnection(
+                DisconnectCause(
+                    DisconnectCause.ERROR,
+                    "Invalid inputs: $accountHandle $componentName"
+                )
+            )
+        }
+    }
+
+    private fun getConnectionForCallId(callId: String): NativeCallWrapper? {
+        return connections.find { connection ->
+            connection.callId == callId
+        }
+    }
+
+    private fun onCallEnded(call: Call) {
+        val connection = getConnectionForCallId(call.callLog.callId)
+        connection ?: return
+
+        connections.remove(connection)
+        connection.setDisconnected(DisconnectCause(DisconnectCause.REJECTED))
+        connection.destroy()
+    }
+
+    private fun onCallConnected(call: Call) {
+        val connection = getConnectionForCallId(call.callLog.callId)
+        connection ?: return
+
+        if (connection.state != Connection.STATE_HOLDING) {
+            connection.setActive()
+        }
+    }
+}

app/src/main/java/org/linphone/telecom/TelecomHelper.kt

@@ -0,0 +1,194 @@
+/*
+ * Copyright (c) 2010-2021 Belledonne Communications SARL.
+ *
+ * This file is part of linphone-android
+ * (see https://www.linphone.org).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.linphone.telecom
+
+import android.annotation.SuppressLint
+import android.annotation.TargetApi
+import android.content.ComponentName
+import android.content.Context
+import android.graphics.drawable.Icon
+import android.net.Uri
+import android.os.Bundle
+import android.telecom.PhoneAccount
+import android.telecom.PhoneAccountHandle
+import android.telecom.TelecomManager
+import android.telecom.TelecomManager.*
+import org.linphone.LinphoneApplication.Companion.coreContext
+import org.linphone.R
+import org.linphone.contact.Contact
+import org.linphone.core.Call
+import org.linphone.core.Core
+import org.linphone.core.CoreListenerStub
+import org.linphone.core.tools.Log
+import org.linphone.utils.LinphoneUtils
+import org.linphone.utils.PermissionHelper
+import org.linphone.utils.SingletonHolder
+
+@TargetApi(26)
+class TelecomHelper private constructor(context: Context) {
+    companion object : SingletonHolder<TelecomHelper, Context>(::TelecomHelper)
+
+    private val telecomManager: TelecomManager = context.getSystemService(Context.TELECOM_SERVICE) as TelecomManager
+
+    private var account: PhoneAccount = initPhoneAccount(context)
+
+    private val listener: CoreListenerStub = object : CoreListenerStub() {
+        override fun onFirstCallStarted(core: Core) {
+            val call = core.calls.firstOrNull()
+            call ?: return
+
+            if (call.dir == Call.Dir.Incoming) {
+                onIncomingCall(call)
+            } else {
+                onOutgoingCall(call)
+            }
+        }
+    }
+
+    init {
+        coreContext.core.addListener(listener)
+        Log.i("[Telecom Helper] Created")
+    }
+
+    fun destroy() {
+        coreContext.core.removeListener(listener)
+        Log.i("[Telecom Helper] Destroyed")
+    }
+
+    fun isAccountEnabled(): Boolean {
+        val enabled = account.isEnabled
+        Log.i("[Telecom Helper] Is account enabled ? $enabled")
+        return enabled
+    }
+
+    @SuppressLint("MissingPermission")
+    fun findExistingAccount(context: Context): PhoneAccount? {
+        if (PermissionHelper.get().hasReadPhoneState()) {
+            var account: PhoneAccount? = null
+            val phoneAccountHandleList: List<PhoneAccountHandle> =
+                telecomManager.selfManagedPhoneAccounts
+            val connectionService = ComponentName(context, TelecomConnectionService::class.java)
+            for (phoneAccountHandle in phoneAccountHandleList) {
+                val phoneAccount: PhoneAccount = telecomManager.getPhoneAccount(phoneAccountHandle)
+                if (phoneAccountHandle.componentName == connectionService) {
+                    Log.i("[Telecom Helper] Found existing phone account: $phoneAccount")
+                    account = phoneAccount
+                    break
+                }
+            }
+            return account
+        }
+        return null
+    }
+
+    fun updateAccount(newAccount: PhoneAccount?) {
+        if (newAccount != null) {
+            Log.i("[Telecom Helper] Updating account object: $newAccount")
+            account = newAccount
+        }
+    }
+
+    fun removeAccount() {
+        if (account.isEnabled) {
+            Log.w("[Telecom Helper] Unregistering phone account handler from telecom manager")
+            telecomManager.unregisterPhoneAccount(account.accountHandle)
+        } else {
+            Log.w("[Telecom Helper] Account wasn't enabled, skipping...")
+        }
+    }
+
+    private fun initPhoneAccount(context: Context): PhoneAccount {
+        val account: PhoneAccount? = findExistingAccount(context)
+        if (account == null) {
+            Log.i("[Telecom Helper] Phone account not found, let's create it")
+            return createAccount(context)
+        }
+        return account
+    }
+
+    private fun createAccount(context: Context): PhoneAccount {
+        val accountHandle = PhoneAccountHandle(
+            ComponentName(context, TelecomConnectionService::class.java),
+            context.packageName
+        )
+        val identity = coreContext.core.defaultAccount?.params?.identityAddress?.asStringUriOnly() ?: ""
+        val account = PhoneAccount.builder(accountHandle, context.getString(R.string.app_name))
+            .setAddress(Uri.parse(identity))
+            .setIcon(Icon.createWithResource(context, R.drawable.linphone_logo_tinted))
+            .setCapabilities(PhoneAccount.CAPABILITY_SELF_MANAGED)
+            .setHighlightColor(context.getColor(R.color.primary_color))
+            .setShortDescription(context.getString(R.string.app_description))
+            .setSupportedUriSchemes(listOf(PhoneAccount.SCHEME_SIP))
+            .build()
+
+        telecomManager.registerPhoneAccount(account)
+        Log.i("[Telecom Helper] Phone account created: $account")
+        return account
+    }
+
+    private fun onIncomingCall(call: Call) {
+        Log.i("[Telecom Helper] Incoming call received from ${call.remoteAddress.asStringUriOnly()}")
+
+        val extras = prepareBundle(call)
+        telecomManager.addNewIncomingCall(
+            account.accountHandle,
+            Bundle().apply {
+                putBundle(EXTRA_INCOMING_CALL_EXTRAS, extras)
+                putParcelable(EXTRA_PHONE_ACCOUNT_HANDLE, account.accountHandle)
+            }
+        )
+    }
+
+    @SuppressLint("MissingPermission")
+    private fun onOutgoingCall(call: Call) {
+        Log.i("[Telecom Helper] Outgoing call started to ${call.remoteAddress.asStringUriOnly()}")
+
+        val extras = prepareBundle(call)
+        telecomManager.placeCall(
+            Uri.parse(call.remoteAddress.asStringUriOnly()),
+            Bundle().apply {
+                putBundle(EXTRA_OUTGOING_CALL_EXTRAS, extras)
+                putParcelable(EXTRA_PHONE_ACCOUNT_HANDLE, account.accountHandle)
+            }
+        )
+    }
+
+    private fun prepareBundle(call: Call): Bundle {
+        val extras = Bundle()
+        val address = call.remoteAddress
+
+        if (call.dir == Call.Dir.Outgoing) {
+            extras.putString(
+                EXTRA_CALL_BACK_NUMBER,
+                call.callLog.fromAddress.asStringUriOnly()
+            )
+        } else {
+            extras.putParcelable(EXTRA_INCOMING_CALL_ADDRESS, Uri.parse(address.asStringUriOnly()))
+        }
+
+        extras.putString("Call-ID", call.callLog.callId)
+
+        val contact: Contact? = coreContext.contactsManager.findContactByAddress(call.remoteAddress)
+        val displayName = contact?.fullName ?: LinphoneUtils.getDisplayName(call.remoteAddress)
+        extras.putString("DisplayName", displayName)
+
+        return extras
+    }
+}

app/src/main/java/org/linphone/utils/PermissionHelper.kt

@@ -69,4 +69,9 @@ class PermissionHelper private constructor(private val context: Context) {
     fun hasRecordAudioPermission(): Boolean {
         return hasPermission(Manifest.permission.RECORD_AUDIO)
     }
+
+    fun hasTelecomManagerPermissions(): Boolean {
+        return hasPermission(Manifest.permission.READ_PHONE_STATE) &&
+            hasPermission(Manifest.permission.MANAGE_OWN_CALLS)
+    }
 }

app/src/main/res/layout/settings_call_fragment.xml

@@ -94,6 +94,15 @@
                     linphone:listener="@{viewModel.encryptionMandatoryListener}"
                     linphone:checked="@={viewModel.encryptionMandatory}"
                     linphone:enabled="@{viewModel.encryptionIndex != 0}" />
+
+                <include
+                    layout="@layout/settings_widget_switch"
+                    linphone:title="@{@string/call_settings_use_telecom_manager_title}"
+                    linphone:subtitle="@{@string/call_settings_use_telecom_manager_summary}"
+                    android:visibility="@{viewModel.api26OrHigher ? View.VISIBLE : View.GONE}"
+                    linphone:listener="@{viewModel.useTelecomManagerListener}"
+                    linphone:checked="@={viewModel.useTelecomManager}"/>
+
                 <include
                     layout="@layout/settings_widget_switch"
                     linphone:title="@{@string/call_settings_full_screen_title}"

app/src/main/res/values-fr/strings.xml

@@ -622,4 +622,6 @@
     <string name="call_settings_auto_start_recording_title">Enregistrer automatiquement les appels</string>
     <string name="advanced_settings_disable_fragment_security_title">Désactiver le mode sécurisé de l\'interface</string>
     <string name="advanced_settings_disable_fragment_security_summary">Autorise l\'écran à être capturé/enregistré sur les vues sensibles</string>
+    <string name="call_settings_use_telecom_manager_title">Améliore les intéractions avec les périphériques bluetooth</string>
+    <string name="call_settings_use_telecom_manager_summary">Nécessite des permissions supplémentaires</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -400,6 +400,8 @@
     <string name="call_settings_media_encryption_zrtp">ZRTP</string>
     <string name="call_settings_media_encryption_dtls">DTLS</string>
     <string name="call_settings_encryption_mandatory_title">Media encryption mandatory</string>
+    <string name="call_settings_use_telecom_manager_title">Improve interactions with bluetooth devices</string>
+    <string name="call_settings_use_telecom_manager_summary">Requires some extra permissions</string>
     <string name="call_settings_full_screen_title">Full screen app while in call</string>
     <string name="call_settings_full_screen_summary">Hides status and navigation bars</string>
     <string name="call_settings_overlay_title">Overlay call notification</string>