diff --git a/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt
index a3656181..7816fa8a 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/AccountActivity.kt
@@ -2,7 +2,6 @@ package com.tutpro.baresip
 
 import android.app.Activity
 import android.content.Intent
-import android.opengl.Visibility
 import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
diff --git a/app/src/main/kotlin/com/tutpro/baresip/AccountListAdapter.kt b/app/src/main/kotlin/com/tutpro/baresip/AccountListAdapter.kt
index fa66729e..fe22718b 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/AccountListAdapter.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/AccountListAdapter.kt
@@ -3,13 +3,13 @@ package com.tutpro.baresip
 import android.content.Context
 import android.content.Intent
 import android.os.Bundle
-import androidx.appcompat.app.AlertDialog
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.ArrayAdapter
 import android.widget.ImageButton
 import android.widget.TextView
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
 
 import java.util.*
 
@@ -53,10 +53,8 @@ class AccountListAdapter(private val cxt: Context, private val rows: ArrayList<A
         }
 
         viewHolder.actionView.setOnClickListener {
-            val titleView = View.inflate(cxt, R.layout.alert_title, null) as TextView
-            titleView.text = cxt.getString(R.string.confirmation)
-            with (AlertDialog.Builder(cxt, R.style.AlertDialog)) {
-                setCustomTitle(titleView)
+            with (MaterialAlertDialogBuilder(cxt, R.style.AlertDialogTheme)) {
+                setTitle(R.string.confirmation)
                 setMessage(String.format(cxt.getString(R.string.delete_account),
                         viewHolder.aorView.text))
                 setPositiveButton(cxt.getText(R.string.delete)) { dialog, _ ->
@@ -69,7 +67,7 @@ class AccountListAdapter(private val cxt: Context, private val rows: ArrayList<A
                     this@AccountListAdapter.notifyDataSetChanged()
                     dialog.dismiss()
                 }
-                setNegativeButton(cxt.getText(R.string.cancel)) { dialog, _ ->
+                setNeutralButton(cxt.getText(R.string.cancel)) { dialog, _ ->
                     dialog.dismiss()
                 }
                 show()
diff --git a/app/src/main/kotlin/com/tutpro/baresip/AccountsActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/AccountsActivity.kt
index 1009cd6e..9b6f47ff 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/AccountsActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/AccountsActivity.kt
@@ -3,13 +3,13 @@ package com.tutpro.baresip
 import android.app.Activity
 import android.content.Intent
 import android.os.Bundle
-import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import android.view.LayoutInflater
 import android.view.Menu
 import android.view.MenuItem
 import android.widget.*
 import androidx.activity.result.contract.ActivityResultContracts
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.tutpro.baresip.databinding.ActivityAccountsBinding
 
 import java.util.ArrayList
@@ -98,7 +98,7 @@ class AccountsActivity : AppCompatActivity() {
         val message = getString(R.string.account) + " " + Utils.plainAor(ua.account.aor)
         messageView.text = message
         val input = layout.findViewById(R.id.password) as EditText
-        with (AlertDialog.Builder(this)) {
+        with (MaterialAlertDialogBuilder(this, R.style.AlertDialogTheme)) {
             setView(layout)
             setPositiveButton(android.R.string.ok) { dialog, _ ->
                 dialog.dismiss()
@@ -110,7 +110,7 @@ class AccountsActivity : AppCompatActivity() {
                 }
                 setAuthPass(ua, password)
             }
-            setNegativeButton(android.R.string.cancel) { dialog, _ ->
+            setNeutralButton(android.R.string.cancel) { dialog, _ ->
                 dialog.cancel()
             }
             show()
diff --git a/app/src/main/kotlin/com/tutpro/baresip/CallsActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/CallsActivity.kt
index 2d2ad07b..4f49a93b 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/CallsActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/CallsActivity.kt
@@ -5,14 +5,12 @@ import android.content.DialogInterface
 import android.content.Intent
 import android.os.Bundle
 import android.os.SystemClock
-import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import android.view.Menu
 import android.view.MenuItem
-import android.view.View
 import android.widget.AdapterView
-import android.widget.TextView
 import androidx.activity.result.contract.ActivityResultContracts
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.tutpro.baresip.databinding.ActivityCallsBinding
 
 import java.util.*
@@ -75,7 +73,8 @@ class CallsActivity : AppCompatActivity() {
             }
             if (SystemClock.elapsedRealtime() - lastClick > 1000) {
                 lastClick = SystemClock.elapsedRealtime()
-                with (AlertDialog.Builder(this@CallsActivity)) {
+                with (MaterialAlertDialogBuilder(this@CallsActivity, R.style.AlertDialogTheme)) {
+                    setTitle(R.string.confirmation)
                     setMessage(String.format(getString(R.string.calls_call_message_question),
                             peerName))
                     setNeutralButton(getString(R.string.cancel), dialogClickListener)
@@ -119,18 +118,20 @@ class CallsActivity : AppCompatActivity() {
                 getString(R.string.calls_calls)
             else
                 getString(R.string.calls_call)
-            val builder = AlertDialog.Builder(this@CallsActivity)
+            val builder = MaterialAlertDialogBuilder(this@CallsActivity, R.style.AlertDialogTheme)
             if (peerName.startsWith("sip:"))
                 with (builder) {
+                    setTitle(R.string.confirmation)
                     setMessage(String.format(getString(R.string.calls_add_delete_question),
                             Utils.friendlyUri(peerName, Utils.aorDomain(aor)), callText))
                     setNeutralButton(getString(R.string.cancel), dialogClickListener)
-                    setNegativeButton(getString(R.string.add_contact), dialogClickListener)
                     setPositiveButton(String.format(getString(R.string.delete), callText), dialogClickListener)
+                    setNegativeButton(getString(R.string.add_contact), dialogClickListener)
                     show()
                 }
             else
                 with (builder) {
+                    setTitle(R.string.confirmation)
                     setMessage(String.format(getString(R.string.calls_delete_question),
                             Utils.friendlyUri(peerName, Utils.aorDomain(aor)), callText))
                     setNeutralButton(getString(R.string.cancel), dialogClickListener)
@@ -152,10 +153,8 @@ class CallsActivity : AppCompatActivity() {
         when (item.itemId) {
 
             R.id.delete_history -> {
-                val titleView = View.inflate(this, R.layout.alert_title, null) as TextView
-                titleView.text = getString(R.string.confirmation)
-                with (AlertDialog.Builder(this@CallsActivity)) {
-                    setCustomTitle(titleView)
+                with (MaterialAlertDialogBuilder(this@CallsActivity, R.style.AlertDialogTheme)) {
+                    setTitle(R.string.confirmation)
                     setMessage(String.format(getString(R.string.delete_history_alert),
                             aor.substringAfter(":")))
                     setPositiveButton(getText(R.string.delete)) { dialog, _ ->
@@ -165,7 +164,7 @@ class CallsActivity : AppCompatActivity() {
                         clAdapter.notifyDataSetChanged()
                         dialog.dismiss()
                     }
-                    setNegativeButton(getText(R.string.cancel)) { dialog, _ ->
+                    setNeutralButton(getText(R.string.cancel)) { dialog, _ ->
                         dialog.dismiss()
                     }
                     show()
diff --git a/app/src/main/kotlin/com/tutpro/baresip/ChatActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/ChatActivity.kt
index dbacd23f..406d8521 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/ChatActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/ChatActivity.kt
@@ -4,7 +4,6 @@ import android.app.Activity
 import android.content.*
 import android.os.Bundle
 import android.os.SystemClock
-import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import android.view.Menu
 import android.view.MenuItem
@@ -13,6 +12,7 @@ import android.view.WindowManager
 import android.view.inputmethod.InputMethodManager
 import android.widget.*
 import androidx.lifecycle.Observer
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.tutpro.baresip.databinding.ActivityChatBinding
 
 class ChatActivity : AppCompatActivity() {
@@ -111,9 +111,10 @@ class ChatActivity : AppCompatActivity() {
                     }
                 }
             }
-            val builder = AlertDialog.Builder(this@ChatActivity)
+            val builder = MaterialAlertDialogBuilder(this@ChatActivity, R.style.AlertDialogTheme)
             if (Contact.contactName(peerUri) == peerUri)
                 with (builder) {
+                    setTitle(R.string.confirmation)
                     setMessage(String.format(getString(R.string.long_message_question),
                     chatPeer))
                     setNeutralButton(getString(R.string.cancel), dialogClickListener)
@@ -123,6 +124,7 @@ class ChatActivity : AppCompatActivity() {
                 }
             else
                 with (builder) {
+                    setTitle(R.string.confirmation)
                     setMessage(getText(R.string.short_message_question))
                     setNeutralButton(getString(R.string.cancel), dialogClickListener)
                     setNegativeButton(getString(R.string.delete), dialogClickListener)
diff --git a/app/src/main/kotlin/com/tutpro/baresip/ChatsActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/ChatsActivity.kt
index 55bde2b0..83c0368f 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/ChatsActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/ChatsActivity.kt
@@ -5,10 +5,8 @@ import android.content.*
 import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
-import android.view.View
 import android.widget.*
 import androidx.activity.result.contract.ActivityResultContracts
-import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.tutpro.baresip.databinding.ActivityChatsBinding
@@ -95,10 +93,11 @@ class ChatsActivity: AppCompatActivity() {
                 }
             }
 
-            val builder = MaterialAlertDialogBuilder(this@ChatsActivity, R.style.AlertDialog)
+            val builder = MaterialAlertDialogBuilder(this@ChatsActivity, R.style.AlertDialogTheme)
             val peer = Contact.contactName(uaMessages[pos].peerUri)
             if (peer.startsWith("sip:"))
                 with (builder) {
+                    setTitle(R.string.confirmation)
                     setMessage(String.format(getString(R.string.long_chat_question),
                             Utils.friendlyUri(peer, Utils.aorDomain(aor))))
                     setNeutralButton(getText(R.string.cancel), dialogClickListener)
@@ -108,6 +107,7 @@ class ChatsActivity: AppCompatActivity() {
                 }
             else
                 with (builder) {
+                    setTitle(R.string.confirmation)
                     setMessage(String.format(getString(R.string.short_chat_question), peer))
                     setNeutralButton(getText(R.string.cancel), dialogClickListener)
                     setNegativeButton(getText(R.string.delete), dialogClickListener)
@@ -179,10 +179,8 @@ class ChatsActivity: AppCompatActivity() {
         when (item.itemId) {
 
             R.id.delete_chats -> {
-                val titleView = View.inflate(this, R.layout.alert_title, null) as TextView
-                titleView.text = getString(R.string.confirmation)
-                with (AlertDialog.Builder(this@ChatsActivity)) {
-                    setCustomTitle(titleView)
+                with (MaterialAlertDialogBuilder(this@ChatsActivity, R.style.AlertDialogTheme)) {
+                    setTitle(R.string.confirmation)
                     setMessage(String.format(getString(R.string.delete_chats_alert),
                             aor.substringAfter(":")))
                     setPositiveButton(getText(R.string.delete)) { dialog, _ ->
@@ -193,7 +191,7 @@ class ChatsActivity: AppCompatActivity() {
                         UserAgent.ofAor(aor)!!.account.unreadMessages = false
                         dialog.dismiss()
                     }
-                    setNegativeButton(getText(R.string.cancel)) { dialog, _ ->
+                    setNeutralButton(getText(R.string.cancel)) { dialog, _ ->
                         dialog.dismiss()
                     }
                     show()
diff --git a/app/src/main/kotlin/com/tutpro/baresip/ConfigActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/ConfigActivity.kt
index 42b9699a..a71a2c99 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/ConfigActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/ConfigActivity.kt
@@ -16,10 +16,10 @@ import android.view.View
 import android.widget.*
 import androidx.activity.result.ActivityResultLauncher
 import androidx.activity.result.contract.ActivityResultContracts
-import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.google.android.material.snackbar.Snackbar
 import com.tutpro.baresip.Utils.copyInputStreamToFile
 import com.tutpro.baresip.Utils.showSnackBar
@@ -342,10 +342,8 @@ class ConfigActivity : AppCompatActivity() {
 
         reset.setOnCheckedChangeListener { _, isChecked ->
             if (isChecked) {
-                val titleView = View.inflate(this, R.layout.alert_title, null) as TextView
-                titleView.text = getString(R.string.confirmation)
-                with(AlertDialog.Builder(this@ConfigActivity)) {
-                    setCustomTitle(titleView)
+                with(MaterialAlertDialogBuilder(this@ConfigActivity, R.style.AlertDialogTheme)) {
+                    setTitle(R.string.confirmation)
                     setMessage(getString(R.string.reset_config_alert))
                     setPositiveButton(getText(R.string.reset)) { dialog, _ ->
                         Config.reset(this@ConfigActivity)
@@ -354,7 +352,7 @@ class ConfigActivity : AppCompatActivity() {
                         done()
                         dialog.dismiss()
                     }
-                    setNegativeButton(getText(R.string.cancel)) { dialog, _ ->
+                    setNeutralButton(getText(R.string.cancel)) { dialog, _ ->
                         reset.isChecked = false
                         dialog.dismiss()
                     }
@@ -377,7 +375,7 @@ class ConfigActivity : AppCompatActivity() {
                         contactsMode = oldContactsMode
                         contactsSpinner.setSelection(contactsModeKeys.indexOf(oldContactsMode))
                         Snackbar.make(layout, getString(R.string.no_android_contacts), Snackbar.LENGTH_LONG)
-                                .setAction(getString(R.string.ok), {})
+                                .setAction(getString(R.string.ok)) {}
                                 .show()
                     }
                 }
diff --git a/app/src/main/kotlin/com/tutpro/baresip/ContactListAdapter.kt b/app/src/main/kotlin/com/tutpro/baresip/ContactListAdapter.kt
index eddda799..0d4bbfd5 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/ContactListAdapter.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/ContactListAdapter.kt
@@ -14,8 +14,8 @@ import android.widget.ArrayAdapter
 import android.widget.ImageButton
 import android.widget.ImageView
 import android.widget.TextView
-import androidx.appcompat.app.AlertDialog
 import androidx.core.content.ContextCompat.startActivity
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import java.io.File
 import java.io.IOException
 
@@ -95,7 +95,8 @@ class ContactListAdapter(private val ctx: Context, private val rows: ArrayList<C
                     }
                     if (SystemClock.elapsedRealtime() - lastClick > 1000) {
                         lastClick = SystemClock.elapsedRealtime()
-                        with(AlertDialog.Builder(ctx, R.style.Theme_AppCompat)) {
+                        with(MaterialAlertDialogBuilder(ctx, R.style.AlertDialogTheme)) {
+                            setTitle(R.string.confirmation)
                             setMessage(String.format(ctx.getString(R.string.contact_action_question),
                                     contact.name))
                             setNeutralButton(ctx.getText(R.string.cancel), dialogClickListener)
@@ -185,16 +186,14 @@ class ContactListAdapter(private val ctx: Context, private val rows: ArrayList<C
                     }
                 }
             }
-            val titleView = View.inflate(ctx, R.layout.alert_title, null) as TextView
-            titleView.text = ctx.getString(R.string.confirmation)
-            with(AlertDialog.Builder(ctx)) {
-                setCustomTitle(titleView)
+            with(MaterialAlertDialogBuilder(ctx, R.style.AlertDialogTheme)) {
+                setTitle(R.string.confirmation)
                 setMessage(String.format(ctx.getString(R.string.contact_delete_question),
                         when (contact) {
                             is Contact.BaresipContact -> contact.name
                             is Contact.AndroidContact -> contact.name
                         }))
-                setNegativeButton(ctx.getText(R.string.cancel), dialogClickListener)
+                setNeutralButton(ctx.getText(R.string.cancel), dialogClickListener)
                 setPositiveButton(ctx.getText(R.string.delete), dialogClickListener)
                 show()
             }
diff --git a/app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt
index 8633ab6e..c7d24f22 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt
@@ -24,7 +24,6 @@ import android.os.*
 import androidx.activity.result.ActivityResultLauncher
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.annotation.RequiresApi
-import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.app.ActivityCompat
@@ -40,6 +39,7 @@ import kotlin.collections.ArrayList
 import kotlin.system.exitProcess
 import android.content.IntentFilter
 import androidx.core.net.toUri
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
 
 class MainActivity : AppCompatActivity() {
 
@@ -297,10 +297,8 @@ class MainActivity : AppCompatActivity() {
                             getString(R.string.peer_not_verified))
                 }
                 "green" -> {
-                    val titleView = View.inflate(this, R.layout.alert_title, null) as TextView
-                    titleView.text = getString(R.string.info)
-                    with(AlertDialog.Builder(this)) {
-                        setCustomTitle(titleView)
+                    with(MaterialAlertDialogBuilder(this, R.style.AlertDialogTheme)) {
+                        setTitle(R.string.info)
                         setMessage(getString(R.string.call_is_secure))
                         setPositiveButton(getString(R.string.unverify)) { dialog, _ ->
                             val calls = Call.uaCalls(UserAgent.uas()[aorSpinner.selectedItemPosition], "")
@@ -314,7 +312,7 @@ class MainActivity : AppCompatActivity() {
                             }
                             dialog.dismiss()
                         }
-                        setNegativeButton(getString(R.string.no)) { dialog, _ ->
+                        setNeutralButton(getString(R.string.no)) { dialog, _ ->
                             dialog.dismiss()
                         }
                         show()
@@ -443,13 +441,11 @@ class MainActivity : AppCompatActivity() {
                             }
                         }
                     }
-                    val titleView = View.inflate(this, R.layout.alert_title, null) as TextView
-                    titleView.text = getString(R.string.voicemail_messages)
-                    with(AlertDialog.Builder(this)) {
-                        setCustomTitle(titleView)
+                    with(MaterialAlertDialogBuilder(this, R.style.AlertDialogTheme)) {
+                        setTitle(R.string.voicemail_messages)
                         setMessage(acc.vmMessages(this@MainActivity))
                         setPositiveButton(getString(R.string.listen), dialogClickListener)
-                        setNegativeButton(getString(R.string.cancel), dialogClickListener)
+                        setNeutralButton(getString(R.string.cancel), dialogClickListener)
                         show()
                     }
                 }
@@ -519,16 +515,14 @@ class MainActivity : AppCompatActivity() {
 
         configRequest = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
             if ((it.data != null) && it.data!!.hasExtra("restart")) {
-                val titleView = View.inflate(this, R.layout.alert_title, null) as TextView
-                titleView.text = getString(R.string.restart_request)
-                with(AlertDialog.Builder(this)) {
-                    setCustomTitle(titleView)
+                with(MaterialAlertDialogBuilder(this, R.style.AlertDialogTheme)) {
+                    setTitle(R.string.restart_request)
                     setMessage(getString(R.string.config_restart))
                     setPositiveButton(getText(R.string.restart)) { dialog, _ ->
                         dialog.dismiss()
                         quitRestart(true)
                     }
-                    setNegativeButton(getText(R.string.cancel)) { dialog, _ ->
+                    setNeutralButton(getText(R.string.cancel)) { dialog, _ ->
                         dialog.dismiss()
                     }
                     show()
@@ -957,16 +951,7 @@ class MainActivity : AppCompatActivity() {
         if (event == "stopped") {
             Log.d(TAG, "Handling service event 'stopped' with param '${params[0]}'")
             if (params[0] != "") {
-                val titleView = View.inflate(this, R.layout.alert_title, null) as TextView
-                titleView.text = getString(R.string.notice)
-                with(AlertDialog.Builder(this)) {
-                    setCustomTitle(titleView)
-                    setMessage(getString(R.string.start_failed))
-                    setNeutralButton(getString(R.string.ok)) { dialog, _ ->
-                        dialog.dismiss()
-                    }
-                    show()
-                }
+                Utils.alertView(this, getString(R.string.notice), getString(R.string.start_failed))
             } else {
                 quitTimer.cancel()
                 finishAndRemoveTask()
@@ -1036,10 +1021,8 @@ class MainActivity : AppCompatActivity() {
                             handleNextEvent("Call $callp to be verified is not found")
                             return
                         }
-                        val titleView = View.inflate(this, R.layout.alert_title, null) as TextView
-                        titleView.text = getString(R.string.verify)
-                        with(AlertDialog.Builder(this)) {
-                            setCustomTitle(titleView)
+                        with(MaterialAlertDialogBuilder(this, R.style.AlertDialogTheme)) {
+                            setTitle(R.string.verify)
                             setMessage(String.format(getString(R.string.verify_sas),
                                     ev[1], ev[2]))
                             setPositiveButton(getString(R.string.yes)) { dialog, _ ->
@@ -1058,7 +1041,7 @@ class MainActivity : AppCompatActivity() {
                                     dialog.dismiss()
                                 }
                             }
-                            setNegativeButton(getString(R.string.no)) { dialog, _ ->
+                            setNeutralButton(getString(R.string.no)) { dialog, _ ->
                                 call.security = R.drawable.box_yellow
                                 call.zid = ev[3]
                                 if (aor == aorSpinner.tag) {
@@ -1101,11 +1084,9 @@ class MainActivity : AppCompatActivity() {
                             return
                         }
                         val call = Call.ofCallp(callp)!!
-                        val titleView = View.inflate(this, R.layout.alert_title, null) as TextView
-                        titleView.text = getString(R.string.transfer_request)
                         val target = Utils.friendlyUri(Contact.contactName(ev[1]), Utils.aorDomain(aor))
-                        with(AlertDialog.Builder(this)) {
-                            setCustomTitle(titleView)
+                        with(MaterialAlertDialogBuilder(this, R.style.AlertDialogTheme)) {
+                            setTitle(R.string.transfer_request)
                             setMessage(String.format(getString(R.string.transfer_request_query),
                                     target))
                             setPositiveButton(getString(R.string.yes)) { dialog, _ ->
@@ -1113,7 +1094,7 @@ class MainActivity : AppCompatActivity() {
                                     acceptTransfer(ua, call, ev[1])
                                 dialog.dismiss()
                             }
-                            setNegativeButton(getString(R.string.no)) { dialog, _ ->
+                            setNeutralButton(getString(R.string.no)) { dialog, _ ->
                                 if (call in Call.calls())
                                     call.notifySipfrag(603, "Decline")
                                 dialog.dismiss()
@@ -1404,7 +1385,7 @@ class MainActivity : AppCompatActivity() {
                 Contact.contactNames()))
         transferUri.threshold = 2
         transferUri.requestFocus()
-        val builder = AlertDialog.Builder(this)
+        val builder = MaterialAlertDialogBuilder(this, R.style.AlertDialogTheme)
         with(builder) {
             setView(layout)
             setPositiveButton(R.string.transfer) { dialog, _ ->
@@ -1430,7 +1411,7 @@ class MainActivity : AppCompatActivity() {
                     }
                 }
             }
-            setNegativeButton(android.R.string.cancel) { dialog, _ ->
+            setNeutralButton(android.R.string.cancel) { dialog, _ ->
                 imm.hideSoftInputFromWindow(transferUri.windowToken, 0)
                 dialog.cancel()
             }
@@ -1455,7 +1436,7 @@ class MainActivity : AppCompatActivity() {
         val input = layout.findViewById(R.id.password) as EditText
         input.requestFocus()
         val context = this
-        with (AlertDialog.Builder(this, R.style.AlertDialog)) {
+        with (MaterialAlertDialogBuilder(this, R.style.AlertDialogTheme)) {
             setView(layout)
             setPositiveButton(android.R.string.ok) { dialog, _ ->
                 imm.hideSoftInputFromWindow(input.windowToken, 0)
@@ -1475,7 +1456,7 @@ class MainActivity : AppCompatActivity() {
                         AccountsActivity.setAuthPass(ua!!, password)
                 }
             }
-            setNegativeButton(android.R.string.cancel) { dialog, _ ->
+            setNeutralButton(android.R.string.cancel) { dialog, _ ->
                 imm.hideSoftInputFromWindow(input.windowToken, 0)
                 dialog.cancel()
             }
@@ -1503,7 +1484,7 @@ class MainActivity : AppCompatActivity() {
                 val input = layout.findViewById(R.id.password) as EditText
                 input.requestFocus()
                 val context = this
-                with (AlertDialog.Builder(this, R.style.AlertDialog)) {
+                with (MaterialAlertDialogBuilder(this, R.style.AlertDialogTheme)) {
                     setView(layout)
                     setPositiveButton(android.R.string.ok) { dialog, _ ->
                         imm.hideSoftInputFromWindow(input.windowToken, 0)
@@ -1517,7 +1498,7 @@ class MainActivity : AppCompatActivity() {
                         }
                         askPasswords(accounts)
                     }
-                    setNegativeButton(android.R.string.cancel) { dialog, _ ->
+                    setNeutralButton(android.R.string.cancel) { dialog, _ ->
                         imm.hideSoftInputFromWindow(input.windowToken, 0)
                         dialog.cancel()
                         aorPasswords[aor] = ""
@@ -1602,16 +1583,14 @@ class MainActivity : AppCompatActivity() {
             return
         }
         Utils.deleteFile(File(zipFilePath))
-        val titleView = View.inflate(this, R.layout.alert_title, null) as TextView
-        titleView.text = getString(R.string.info)
-        with(AlertDialog.Builder(this)) {
-            setCustomTitle(titleView)
+        with(MaterialAlertDialogBuilder(this, R.style.AlertDialogTheme)) {
+            setTitle(getString(R.string.info))
             setMessage(getString(R.string.restored))
             setPositiveButton(getText(R.string.restart)) { dialog, _ ->
                 quitRestart(true)
                 dialog.dismiss()
             }
-            setNegativeButton(getText(R.string.cancel)) { dialog, _ ->
+            setNeutralButton(getText(R.string.cancel)) { dialog, _ ->
                 dialog.dismiss()
             }
             show()
@@ -1710,14 +1689,14 @@ class MainActivity : AppCompatActivity() {
                             Utils.alertView(this, getString(R.string.notice),
                                     getString(R.string.no_telephony_providers))
                         } else {
-                            val builder = AlertDialog.Builder(this)
+                            val builder = MaterialAlertDialogBuilder(this, R.style.AlertDialogTheme)
                             with(builder) {
                                 setTitle(getString(R.string.choose_telephony_provider_account))
                                 setItems(telAccounts) { _, which ->
                                     spinToAor("sip:${telAccounts[which]}")
                                     makeCall()
                                 }
-                                setPositiveButton("Cancel") { _: DialogInterface, _: Int -> }
+                                setNeutralButton("Cancel") { _: DialogInterface, _: Int -> }
                                 show()
                             }
                         }
diff --git a/app/src/main/kotlin/com/tutpro/baresip/Utils.kt b/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
index c131ebc1..9215591f 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
@@ -27,10 +27,10 @@ import android.widget.ImageView
 import android.widget.TextView
 import androidx.activity.result.ActivityResultLauncher
 import androidx.annotation.RequiresApi
-import androidx.appcompat.app.AlertDialog
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.ProcessLifecycleOwner
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.google.android.material.snackbar.Snackbar
 import java.io.*
 import java.lang.reflect.Method
@@ -70,10 +70,8 @@ object Utils {
     }
 
     fun alertView(context: Context, title: String, message: String, action: () -> (Unit) = {}) {
-        val titleView = View.inflate(context, R.layout.alert_title, null) as TextView
-        titleView.text = title
-        with(AlertDialog.Builder(context, R.style.AlertDialog)) {
-            setCustomTitle(titleView)
+        with(MaterialAlertDialogBuilder(context, R.style.AlertDialogTheme)) {
+            setTitle(title)
             setMessage(message)
             setPositiveButton(R.string.ok) { dialog, _ ->
                 dialog.dismiss()
diff --git a/app/src/main/res/layout/alert_title.xml b/app/src/main/res/layout/alert_title.xml
index 55f47ae1..3ff963ab 100644
--- a/app/src/main/res/layout/alert_title.xml
+++ b/app/src/main/res/layout/alert_title.xml
@@ -7,4 +7,3 @@
     android:background="@color/colorPrimary"
     android:textColor="@color/colorWhite" >
 </TextView>
-
diff --git a/app/src/main/res/layout/call_transfer_dialog.xml b/app/src/main/res/layout/call_transfer_dialog.xml
index c455959e..79e76216 100644
--- a/app/src/main/res/layout/call_transfer_dialog.xml
+++ b/app/src/main/res/layout/call_transfer_dialog.xml
@@ -8,15 +8,24 @@
         android:id="@+id/title"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:padding="?dialogPreferredPadding"
+        android:paddingTop="?dialogPreferredPadding"
+        android:paddingStart="?dialogPreferredPadding"
+        android:paddingEnd="?dialogPreferredPadding"
         android:textSize="20sp"
-        android:background="@color/colorPrimary"
-        android:textColor="@color/colorWhite" />
+        android:textColor="@color/colorPrimary" />
+
+    <TextView
+        android:id="@+id/transferDestination"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:padding="?dialogPreferredPadding"
+        android:textSize="16sp"
+        android:text="@string/transfer_destination"
+        android:textColor="@color/colorStrong" />
 
     <com.google.android.material.textfield.TextInputLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:paddingTop="20dp"
         android:paddingStart="?dialogPreferredPadding"
         android:paddingEnd="?dialogPreferredPadding" >
 
@@ -25,8 +34,9 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:importantForAutofill="no"
+            android:textSize="18sp"
             android:imeOptions="actionDone"
-            android:hint="@string/transfer_destination"
+            android:labelFor="@id/transferUri"
             android:inputType="textEmailAddress" />
 
     </com.google.android.material.textfield.TextInputLayout>
diff --git a/app/src/main/res/layout/password_dialog.xml b/app/src/main/res/layout/password_dialog.xml
index 026b4831..e10ab589 100644
--- a/app/src/main/res/layout/password_dialog.xml
+++ b/app/src/main/res/layout/password_dialog.xml
@@ -15,17 +15,19 @@
             android:id="@+id/title"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:padding="?dialogPreferredPadding"
+            android:paddingTop="?dialogPreferredPadding"
+            android:paddingStart="?dialogPreferredPadding"
+            android:paddingEnd="?dialogPreferredPadding"
             android:textSize="20sp"
-            android:textColor="@color/colorWhite"
-            android:background="@color/colorPrimary" />
+            android:textColor="@color/colorPrimary" />
 
         <TextView
             android:id="@+id/message"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:paddingTop="15dp"
-            android:textSize="15sp"
+            android:paddingBottom="15dp"
+            android:textSize="16sp"
             android:paddingStart="?dialogPreferredPadding"
             android:paddingEnd="?dialogPreferredPadding" />
 
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index 2f2313f7..dfab6093 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -28,14 +28,37 @@
         <item name="android:divider">@color/colorSpinnerDivider</item>
     </style>
 
-    <style name="AlertDialog" parent="Theme.MaterialComponents.DayNight.Dialog.Alert">
-        <item name="colorAccent">@color/colorAccent</item>
-        <item name="android:textColorPrimary">@color/colorAlertText</item>
-        <item name="android:windowBackground">#201D1D</item>
+    <style name="AlertDialogTheme">
+        <item name="buttonBarPositiveButtonStyle">@style/Alert.Button.Positive</item>
+        <item name="buttonBarNegativeButtonStyle">@style/Alert.Button.Positive</item>
+        <item name="buttonBarNeutralButtonStyle">@style/Alert.Button.Neutral</item>
+        <item name="materialAlertDialogBodyTextStyle">@style/Alert.Message</item>
+        <item name="materialAlertDialogTitleTextStyle">@style/Alert.Title</item>
+        <item name="android:textSize">14sp</item>
     </style>
 
-    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.DayNight.ActionBar" />
+    <style name="Alert.Button.Positive" parent="Widget.MaterialComponents.Button.TextButton">
+        <item name="android:textColor">@color/colorPrimaryDark</item>
+        <item name="rippleColor">@color/colorAccent</item>
+        <item name="android:textSize">14sp</item>
+        <item name="android:textAllCaps">true</item>
+    </style>
 
-    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.DayNight" />
+    <style name="Alert.Button.Neutral" parent="Widget.MaterialComponents.Button.TextButton">
+        <item name="backgroundTint">@android:color/transparent</item>
+        <item name="rippleColor">@color/colorAccent</item>
+        <item name="android:textColor">@color/colorGray</item>
+        <item name="android:textSize">14sp</item>
+    </style>
+
+    <style name="Alert.Title" parent="@style/MaterialAlertDialog.MaterialComponents.Title.Text">
+        <item name="android:textColor">@color/colorPrimary</item>
+        <item name="android:textSize">20sp</item>
+    </style>
+
+    <style name="Alert.Message" parent="@style/MaterialAlertDialog.MaterialComponents.Body.Text">
+        <item name="android:textColor">@color/colorStrong</item>
+        <item name="android:textSize">16sp</item>
+    </style>
 
 </resources>