Add default option for Advanced Machine Detection (#499)

Author: SecondeJK

src/Voice/VoiceObjects/AdvancedMachineDetection.php

@@ -10,10 +10,15 @@ class AdvancedMachineDetection implements ArrayHydrateInterface
     public const MACHINE_BEHAVIOUR_HANGUP = 'hangup';
     public const MACHINE_MODE_DETECT = 'detect';
     public const MACHINE_MODE_DETECT_BEEP = 'detect_beep';
+    public const MACHINE_MODE_DEFAULT = 'default';
     public const BEEP_TIMEOUT_MIN = 45;
     public const BEEP_TIMEOUT_MAX = 120;
     protected array $permittedBehaviour = [self::MACHINE_BEHAVIOUR_CONTINUE, self::MACHINE_BEHAVIOUR_HANGUP];
-    protected array $permittedModes = [self::MACHINE_MODE_DETECT, self::MACHINE_MODE_DETECT_BEEP];
+    protected array $permittedModes = [
+        self::MACHINE_MODE_DETECT,
+        self::MACHINE_MODE_DETECT_BEEP,
+        self::MACHINE_MODE_DEFAULT
+    ];
 
     public function __construct(
         protected string $behaviour,