diff --git a/app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt
index f1d48506..eef3c467 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt
@@ -11,6 +11,7 @@ import android.content.Intent.ACTION_CALL
 import android.content.Intent.ACTION_DIAL
 import android.content.Intent.ACTION_VIEW
 import android.content.pm.PackageManager
+import android.content.res.Configuration
 import android.content.res.Configuration.ORIENTATION_PORTRAIT
 import android.media.AudioManager
 import android.net.Uri
@@ -833,6 +834,12 @@ class MainActivity : AppCompatActivity() {
         BaresipService.activities.clear()
     }
 
+    override fun onConfigurationChanged(newConfig: Configuration) {
+        super.onConfigurationChanged(newConfig)
+        if (dtmf.isEnabled)
+            dtmf.requestFocus()
+    }
+
     override fun onNewIntent(intent: Intent) {
         // Called when MainActivity already exists at the top of current task
         super.onNewIntent(intent)