After the SDK changes to IOS audio routes, we now update bluetooth availability flag in “onAudioDevicesListUpdated” callback, and we manually set the route to bluetooth when starting calls with an available bluetooth device (this allows the overriding, from the App, of the core.defaultOutputDevice settings for the SDK)

Classes/CallManager.swift

@@ -48,7 +48,6 @@ import AVFoundation
 	var conference: Conference?
 	
 	
-	
 	var backgroundContextCall : Call?
 	@objc var backgroundContextCameraIsEnabled : Bool = false
 
@@ -140,27 +139,17 @@ import AVFoundation
 	}
 	
 	@objc func changeRouteToSpeaker() {
-		for device in lc!.audioDevices {
-			if (device.type == AudioDeviceType.Speaker) {
-				lc!.outputAudioDevice = device
-				break
-			}
-		}
+		lc?.outputAudioDevice = lc?.audioDevices.first { $0.type == AudioDeviceType.Speaker }
 		UIDevice.current.isProximityMonitoringEnabled = false
 	}
 	
 	@objc func changeRouteToBluetooth() {
-		for device in lc!.audioDevices {
-			if (device.type == AudioDeviceType.Bluetooth || device.type == AudioDeviceType.BluetoothA2DP) {
-				lc!.outputAudioDevice = device
-				break
-			}
-		}
+		lc?.outputAudioDevice = lc?.audioDevices.first { $0.type == AudioDeviceType.BluetoothA2DP || $0.type == AudioDeviceType.Bluetooth }
 		UIDevice.current.isProximityMonitoringEnabled = (lc!.callsNb > 0)
 	}
 	
 	@objc func changeRouteToDefault() {
-		lc!.outputAudioDevice = lc!.defaultOutputAudioDevice
+		lc?.outputAudioDevice = lc?.defaultOutputAudioDevice
 	}
 	
 	@objc func isBluetoothAvailable() -> Bool {
@@ -485,6 +474,15 @@ import AVFoundation
 		}
 	}
 	
+	func onAudioDevicesListUpdated(core: Core) {
+		let bluetoothAvailable = isBluetoothAvailable();
+		
+		var dict = Dictionary<String, Bool>()
+		dict["available"] = bluetoothAvailable
+		NotificationCenter.default.post(name: Notification.Name("LinphoneBluetoothAvailabilityUpdate"), object: self, userInfo: dict)
+		
+	}
+
 	func onCallStateChanged(core: Core, call: Call, state cstate: Call.State, message: String) {
 		let callLog = call.callLog
 		let callId = callLog?.callId
@@ -635,9 +633,11 @@ import AVFoundation
 			}
 
 			if (cstate == .IncomingReceived || cstate == .OutgoingInit || cstate == .Connected || cstate == .StreamsRunning) {
-				let check = call.currentParams?.videoEnabled
 				if ((call.currentParams?.videoEnabled ?? false) && CallManager.instance().isReceiverEnabled()) {
 					CallManager.instance().changeRouteToSpeaker()
+				} else if (isBluetoothAvailable()) {
+					// Use bluetooth device by default if one is available
+					CallManager.instance().changeRouteToBluetooth()
 				}
 			}
 		}

Classes/CallOutgoingView.m

@@ -99,7 +99,7 @@ static UICompositeViewDescription *compositeDescription = nil;
 	ms_free(uri);
 	[_avatarImage setImage:[FastAddressBook imageForAddress:addr] bordered:NO withRoundedRadius:YES];
 
-	[self hideSpeaker:LinphoneManager.instance.bluetoothAvailable];
+	[self hideSpeaker: [CallManager.instance isBluetoothAvailable]];
 
 	[_speakerButton update];
 	[_microButton update];

Classes/CallView.m

@@ -148,7 +148,7 @@ static UICompositeViewDescription *compositeDescription = nil;
 	[self hideRoutes:TRUE animated:FALSE];
 	[self hideOptions:TRUE animated:FALSE];
 	[self hidePad:TRUE animated:FALSE];
-	[self hideSpeaker:LinphoneManager.instance.bluetoothAvailable];
+	[self hideSpeaker: [CallManager.instance isBluetoothAvailable]];
 	[self callDurationUpdate];
 	[self onCurrentCallChange];
 	// Set windows (warn memory leaks)

Classes/LinphoneManager.h

@@ -200,7 +200,6 @@ typedef struct _LinphoneManagerSounds {
 @property (readonly) sqlite3* database;
 @property (readonly) LinphoneManagerSounds sounds;
 @property (readonly) NSMutableArray *logs;
-@property (nonatomic, assign) BOOL bluetoothAvailable;
 @property (readonly) NSString* contactSipField;
 @property (readonly,copy) NSString* contactFilter;
 @property (copy) void (^silentPushCompletion)(UIBackgroundFetchResult);

Classes/LinphoneManager.m

@@ -231,10 +231,6 @@ struct codec_name_pref_table codec_pref_table[] = {{"speex", 8000, "speex_8k_pre
 
 - (id)init {
 	if ((self = [super init])) {
-		[NSNotificationCenter.defaultCenter addObserver:self
-		 selector:@selector(audioRouteChangeListenerCallback:)
-		 name:AVAudioSessionRouteChangeNotification
-		 object:nil];
 
 		NSString *path = [[NSBundle mainBundle] pathForResource:@"msg" ofType:@"wav"];
 		self.messagePlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL URLWithString:path] error:nil];
@@ -1742,19 +1738,6 @@ static int comp_call_state_paused(const LinphoneCall *call, const void *param) {
 }
 #pragma mark - Audio route Functions
 
-- (void)audioRouteChangeListenerCallback:(NSNotification *)notif {
-	if (IPAD)
-		return;
-	
-	_bluetoothAvailable = [CallManager.instance isBluetoothAvailable];
-	
-	NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:_bluetoothAvailable], @"available", nil];
-	[NSNotificationCenter.defaultCenter postNotificationName:kLinphoneBluetoothAvailabilityUpdate
-	 object:self
-	 userInfo:dict];
-	
-}
-
 #pragma mark - Call Functions
 - (void)send:(NSString *)replyText toChatRoom:(LinphoneChatRoom *)room {	
 	LinphoneChatMessage *msg = linphone_chat_room_create_message(room, replyText.UTF8String);

Podfile

@@ -5,7 +5,7 @@ source "https://github.com/CocoaPods/Specs.git"
 
 def all_pods
 	if ENV['PODFILE_PATH'].nil?
-		pod 'linphone-sdk', '~> 5.0.16'
+		pod 'linphone-sdk', '~> 5.0.63'
 	else
 		pod 'linphone-sdk', :path => ENV['PODFILE_PATH']  # local sdk
 	end