diff --git a/app/src/main/java/org/linphone/activities/main/chat/viewmodels/ChatRoomViewModel.kt b/app/src/main/java/org/linphone/activities/main/chat/viewmodels/ChatRoomViewModel.kt
index 092181294..41a8b1bfc 100644
--- a/app/src/main/java/org/linphone/activities/main/chat/viewmodels/ChatRoomViewModel.kt
+++ b/app/src/main/java/org/linphone/activities/main/chat/viewmodels/ChatRoomViewModel.kt
@@ -240,7 +240,7 @@ class ChatRoomViewModel(val chatRoom: ChatRoom) : ViewModel(), ContactViewModelI
         var body = ""
         for (content in msg.contents) {
             if (content.isFile || content.isFileTransfer) body += content.name + " "
-            else if (content.isText) body += content.stringBuffer + " "
+            else if (content.isText) body += content.utf8Text + " "
         }
 
         return "$sender: $body"
diff --git a/app/src/main/java/org/linphone/activities/main/chat/viewmodels/GroupInfoViewModel.kt b/app/src/main/java/org/linphone/activities/main/chat/viewmodels/GroupInfoViewModel.kt
index 4dec5d79c..a8e599ded 100644
--- a/app/src/main/java/org/linphone/activities/main/chat/viewmodels/GroupInfoViewModel.kt
+++ b/app/src/main/java/org/linphone/activities/main/chat/viewmodels/GroupInfoViewModel.kt
@@ -71,7 +71,7 @@ class GroupInfoViewModel(val chatRoom: ChatRoom?) : ErrorReportingViewModel() {
         }
 
         override fun onSubjectChanged(chatRoom: ChatRoom, eventLog: EventLog) {
-            subject.value = chatRoom?.subject
+            subject.value = chatRoom.subject
         }
 
         override fun onParticipantAdded(chatRoom: ChatRoom, eventLog: EventLog) {
@@ -83,7 +83,7 @@ class GroupInfoViewModel(val chatRoom: ChatRoom?) : ErrorReportingViewModel() {
         }
 
         override fun onParticipantAdminStatusChanged(chatRoom: ChatRoom, eventLog: EventLog) {
-            val admin = chatRoom?.me?.isAdmin ?: false
+            val admin = chatRoom.me?.isAdmin ?: false
             isMeAdmin.value = admin
             meAdminChangedEvent.value = Event(admin)
             updateParticipants()
diff --git a/app/src/main/java/org/linphone/activities/main/viewmodels/StatusViewModel.kt b/app/src/main/java/org/linphone/activities/main/viewmodels/StatusViewModel.kt
index 9122b548b..d72bb2263 100644
--- a/app/src/main/java/org/linphone/activities/main/viewmodels/StatusViewModel.kt
+++ b/app/src/main/java/org/linphone/activities/main/viewmodels/StatusViewModel.kt
@@ -51,10 +51,10 @@ open class StatusViewModel : ViewModel() {
             body: Content
         ) {
             if (body.type == "application" && body.subtype == "simple-message-summary" && body.size > 0) {
-                val data = body.stringBuffer.toLowerCase(Locale.getDefault())
-                val voiceMail = data.split("voice-message: ")
-                if (voiceMail.size >= 2) {
-                    val toParse = voiceMail[1].split("/", limit = 0)
+                val data = body.utf8Text?.toLowerCase(Locale.getDefault())
+                val voiceMail = data?.split("voice-message: ")
+                if (voiceMail?.size ?: 0 >= 2) {
+                    val toParse = voiceMail!![1].split("/", limit = 0)
                     try {
                         val unreadCount: Int = toParse[0].toInt()
                         voiceMailCount.value = unreadCount
diff --git a/app/src/main/java/org/linphone/core/CoreContext.kt b/app/src/main/java/org/linphone/core/CoreContext.kt
index 5dcee217a..8e4e0cd4d 100644
--- a/app/src/main/java/org/linphone/core/CoreContext.kt
+++ b/app/src/main/java/org/linphone/core/CoreContext.kt
@@ -341,8 +341,11 @@ class CoreContext(val context: Context, coreConfig: Config) {
     fun declineCall(call: Call) {
         val voiceMailUri = corePreferences.voiceMailUri
         if (voiceMailUri != null && corePreferences.redirectDeclinedCallToVoiceMail) {
-            Log.i("[Context] Redirecting call $call to voice mail")
-            call.redirect(voiceMailUri)
+            val voiceMailAddress = core.interpretUrl(voiceMailUri)
+            if (voiceMailAddress != null) {
+                Log.i("[Context] Redirecting call $call to voice mail URI: $voiceMailUri")
+                call.redirectTo(voiceMailAddress)
+            }
         } else {
             Log.i("[Context] Declining call $call")
             call.decline(Reason.Declined)
@@ -359,8 +362,11 @@ class CoreContext(val context: Context, coreConfig: Config) {
         if (currentCall == null) {
             Log.e("[Context] Couldn't find a call to transfer")
         } else {
-            Log.i("[Context] Transferring current call to $addressToCall")
-            currentCall.transfer(addressToCall)
+            val address = core.interpretUrl(addressToCall)
+            if (address != null) {
+                Log.i("[Context] Transferring current call to $addressToCall")
+                currentCall.transferTo(address)
+            }
         }
     }
 
diff --git a/app/src/main/java/org/linphone/notifications/NotificationBroadcastReceiver.kt b/app/src/main/java/org/linphone/notifications/NotificationBroadcastReceiver.kt
index ac6b71ef1..a8b9b5fe2 100644
--- a/app/src/main/java/org/linphone/notifications/NotificationBroadcastReceiver.kt
+++ b/app/src/main/java/org/linphone/notifications/NotificationBroadcastReceiver.kt
@@ -79,7 +79,7 @@ class NotificationBroadcastReceiver : BroadcastReceiver() {
                 return
             }
 
-            val msg = room.createMessage(reply)
+            val msg = room.createMessageFromUtf8(reply)
             msg.userData = notificationId
             msg.addListener(coreContext.notificationsManager.chatListener)
             msg.send()
@@ -90,10 +90,11 @@ class NotificationBroadcastReceiver : BroadcastReceiver() {
     }
 
     private fun handleCallIntent(intent: Intent, notificationId: Int) {
-        val remoteAddress: String? = coreContext.notificationsManager.getSipUriForCallNotificationId(notificationId)
+        val remote: String = coreContext.notificationsManager.getSipUriForCallNotificationId(notificationId) ?: ""
         val core: Core = coreContext.core
 
-        val call = if (remoteAddress != null) core.findCallFromUri(remoteAddress) else null
+        val remoteAddress = core.interpretUrl(remote)
+        val call = if (remoteAddress != null) core.getCallByRemoteAddress2(remoteAddress) else null
         if (call == null) {
             Log.e("[Notification Broadcast Receiver] Couldn't find call from remote address $remoteAddress")
             return
diff --git a/app/src/main/java/org/linphone/notifications/NotificationsManager.kt b/app/src/main/java/org/linphone/notifications/NotificationsManager.kt
index 754a31676..cf2c6b2e9 100644
--- a/app/src/main/java/org/linphone/notifications/NotificationsManager.kt
+++ b/app/src/main/java/org/linphone/notifications/NotificationsManager.kt
@@ -116,7 +116,6 @@ class NotificationsManager(private val context: Context) {
             state: Call.State,
             message: String
         ) {
-            if (call == null) return
             Log.i("[Notifications Manager] Call state changed [$state]")
 
             when (state) {