diff --git a/lib/Controller/PresetController.php b/lib/Controller/PresetController.php
new file mode 100644
index 00000000000..41f0b4a167f
--- /dev/null
+++ b/lib/Controller/PresetController.php
@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Talk\Controller;
+
+use OCA\Talk\ResponseDefinitions;
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\Attribute\ApiRoute;
+use OCP\AppFramework\Http\Attribute\NoAdminRequired;
+use OCP\AppFramework\Http\DataResponse;
+use OCP\IRequest;
+
+/**
+ * @psalm-import-type TalkConversationPreset from ResponseDefinitions
+ */
+class PresetController extends AEnvironmentAwareOCSController {
+
+	public function __construct(
+		string $appName,
+		IRequest $request,
+	) {
+		parent::__construct($appName, $request);
+	}
+
+	/**
+	 * Get the list of available presets
+	 *
+	 * @return DataResponse<Http::STATUS_OK, list<TalkConversationPreset>, array{}>
+	 *
+	 * 200: Successfully got presets
+	 */
+	#[NoAdminRequired]
+	#[ApiRoute(verb: 'GET', url: '/api/{apiVersion}/preset', requirements: [
+		'apiVersion' => '(v1)',
+		'token' => '[a-z0-9]{4,30}',
+	])]
+	public function getPresets(): DataResponse {
+		return new DataResponse([], Http::STATUS_OK);
+	}
+}
diff --git a/lib/Controller/RoomController.php b/lib/Controller/RoomController.php
index c7d76740652..571e0e7bcd2 100644
--- a/lib/Controller/RoomController.php
+++ b/lib/Controller/RoomController.php
@@ -55,6 +55,8 @@
 use OCA\Talk\Participant;
 use OCA\Talk\ResponseDefinitions;
 use OCA\Talk\Room;
+use OCA\Talk\RoomPresets\Parameter;
+use OCA\Talk\RoomPresets\Preset;
 use OCA\Talk\Service\BanService;
 use OCA\Talk\Service\BreakoutRoomService;
 use OCA\Talk\Service\ChecksumVerificationService;
@@ -64,6 +66,7 @@
 use OCA\Talk\Service\PhoneService;
 use OCA\Talk\Service\RecordingService;
 use OCA\Talk\Service\RoomFormatter;
+use OCA\Talk\Service\RoomPresetService;
 use OCA\Talk\Service\RoomService;
 use OCA\Talk\Service\SessionService;
 use OCA\Talk\Service\ThreadService;
@@ -153,6 +156,7 @@ public function __construct(
 		protected IURLGenerator $url,
 		protected IL10N $l,
 		protected ThreadService $threadService,
+		protected RoomPresetService $presetService,
 	) {
 		parent::__construct($appName, $request);
 	}
@@ -590,7 +594,7 @@ protected function formatRoom(
 	 * In case the `$roomType` is {@see Room::TYPE_ONE_TO_ONE} only the `$invite`
 	 * or `$participants` parameter is supported.
 	 *
-	 * @param int $roomType Type of the room
+	 * @param ?int $roomType Type of the room
 	 * @psalm-param Room::TYPE_* $roomType
 	 * @param string $invite User, group, … ID to invite @deprecated Use the `$participants` array instead
 	 * @param string $roomName Name of the room, unless the legacy mode providing `$invite` and `$source` is used, the name must no longer be empty with the `conversation-creation-all` capability (Ignored if `$roomType` is {@see Room::TYPE_ONE_TO_ONE})
@@ -598,29 +602,31 @@ protected function formatRoom(
 	 * @param string $objectType Type of the object (Ignored if `$roomType` is {@see Room::TYPE_ONE_TO_ONE})
 	 * @param string $objectId ID of the object (Ignored if `$roomType` is {@see Room::TYPE_ONE_TO_ONE})
 	 * @param string $password The room password (only available with `conversation-creation-password` capability) (Ignored if `$roomType` is not {@see Room::TYPE_PUBLIC})
-	 * @param 0|1 $readOnly Read only state of the conversation (Default writable) (only available with `conversation-creation-all` capability)
-	 * @psalm-param Room::READ_* $readOnly
-	 * @param 0|1|2 $listable Scope where the conversation is listable (Default not listable for anyone) (only available with `conversation-creation-all` capability)
-	 * @psalm-param Room::LISTABLE_* $listable
-	 * @param int $messageExpiration Seconds after which messages will disappear, 0 disables expiration (Default 0) (only available with `conversation-creation-all` capability)
-	 * @psalm-param non-negative-int $messageExpiration
-	 * @param 0|1 $lobbyState Lobby state of the conversation (Default lobby is disabled) (only available with `conversation-creation-all` capability)
-	 * @psalm-param Webinary::LOBBY_* $lobbyState
+	 * @param 0|1|null $readOnly Read only state of the conversation (Default writable) (only available with `conversation-creation-all` capability)
+	 * @psalm-param ?Room::READ_* $readOnly
+	 * @param 0|1|2|null $listable Scope where the conversation is listable (Default not listable for anyone) (only available with `conversation-creation-all` capability)
+	 * @psalm-param ?Room::LISTABLE_* $listable
+	 * @param ?int $messageExpiration Seconds after which messages will disappear, 0 disables expiration (Default 0) (only available with `conversation-creation-all` capability)
+	 * @psalm-param ?non-negative-int $messageExpiration
+	 * @param 0|1|null $lobbyState Lobby state of the conversation (Default lobby is disabled) (only available with `conversation-creation-all` capability)
+	 * @psalm-param ?Webinary::LOBBY_* $lobbyState
 	 * @param int|null $lobbyTimer Timer when the lobby will be removed (Default null, will not be disabled automatically) (only available with `conversation-creation-all` capability)
-	 * @psalm-param non-negative-int|null $lobbyTimer
-	 * @param 0|1|2 $sipEnabled Whether SIP dial-in shall be enabled (only available with `conversation-creation-all` capability)
-	 * @psalm-param Webinary::SIP_* $sipEnabled
-	 * @param int<0, 255> $permissions Default permissions for participants (only available with `conversation-creation-all` capability)
-	 * @psalm-param int-mask-of<Attendee::PERMISSIONS_*> $permissions
-	 * @param 0|1 $recordingConsent Whether participants need to agree to a recording before joining a call (only available with `conversation-creation-all` capability)
-	 * @psalm-param RecordingService::CONSENT_REQUIRED_NO|RecordingService::CONSENT_REQUIRED_YES $recordingConsent
-	 * @param 0|1 $mentionPermissions Who can mention at-all in the chat (only available with `conversation-creation-all` capability)
-	 * @psalm-param Room::MENTION_PERMISSIONS_* $mentionPermissions
+	 * @psalm-param ?non-negative-int $lobbyTimer
+	 * @param 0|1|2|null $sipEnabled Whether SIP dial-in shall be enabled (only available with `conversation-creation-all` capability)
+	 * @psalm-param ?Webinary::SIP_* $sipEnabled
+	 * @param int<0, 255>|null $permissions Default permissions for participants (only available with `conversation-creation-all` capability)
+	 * @psalm-param ?int-mask-of<Attendee::PERMISSIONS_*> $permissions
+	 * @param 0|1|null $recordingConsent Whether participants need to agree to a recording before joining a call (only available with `conversation-creation-all` capability)
+	 * @psalm-param RecordingService::CONSENT_REQUIRED_NO|RecordingService::CONSENT_REQUIRED_YES|null $recordingConsent
+	 * @param 0|1|null $mentionPermissions Who can mention at-all in the chat (only available with `conversation-creation-all` capability)
+	 * @psalm-param ?Room::MENTION_PERMISSIONS_* $mentionPermissions
 	 * @param string $description Description for the conversation (limited to 2.000 characters) (only available with `conversation-creation-all` capability)
 	 * @param ?non-empty-string $emoji Emoji for the avatar of the conversation (only available with `conversation-creation-all` capability)
 	 * @param ?non-empty-string $avatarColor Background color of the avatar (Only considered when an emoji was provided) (only available with `conversation-creation-all` capability)
 	 * @param array<string, list<string>> $participants List of participants to add grouped by type (only available with `conversation-creation-all` capability)
 	 * @psalm-param TalkInvitationList $participants
+	 * @param 0|1|2|3|null $preset Which preset should be used for not-given (null) parameters (only available with `conversation-preset` capability)
+	 * @psalm-param ?Preset $preset
 	 * @return DataResponse<Http::STATUS_OK|Http::STATUS_CREATED, TalkRoom, array{}>|DataResponse<Http::STATUS_ACCEPTED, TalkRoomWithInvalidInvitations, array{}>|DataResponse<Http::STATUS_BAD_REQUEST|Http::STATUS_FORBIDDEN|Http::STATUS_NOT_FOUND, array{error: 'avatar'|'description'|'invite'|'listable'|'lobby'|'lobby-timer'|'mention-permissions'|'message-expiration'|'name'|'object'|'object-id'|'object-type'|'password'|'permissions'|'read-only'|'recording-consent'|'sip-enabled'|'type', message?: string}, array{}>
 	 *
 	 * 200: Room already existed
@@ -635,26 +641,27 @@ protected function formatRoom(
 		'apiVersion' => '(v4)',
 	])]
 	public function createRoom(
-		int $roomType = Room::TYPE_GROUP,
+		?int $roomType = null,
 		string $invite = '', /* @deprecated */
 		string $roomName = '',
 		string $source = '', /* @deprecated */
 		string $objectType = '',
 		string $objectId = '',
 		string $password = '',
-		int $readOnly = Room::READ_WRITE,
-		int $listable = Room::LISTABLE_NONE,
-		int $messageExpiration = 0,
-		int $lobbyState = Webinary::LOBBY_NONE,
+		?int $readOnly = null,
+		?int $listable = null,
+		?int $messageExpiration = null,
+		?int $lobbyState = null,
 		?int $lobbyTimer = null,
-		int $sipEnabled = Webinary::SIP_DISABLED,
-		int $permissions = Attendee::PERMISSIONS_DEFAULT,
-		int $recordingConsent = RecordingService::CONSENT_REQUIRED_NO,
-		int $mentionPermissions = Room::MENTION_PERMISSIONS_EVERYONE,
+		?int $sipEnabled = null,
+		?int $permissions = null,
+		?int $recordingConsent = null,
+		?int $mentionPermissions = null,
 		string $description = '',
 		?string $emoji = null,
 		?string $avatarColor = null,
 		array $participants = [],
+		?int $preset = null,
 	): DataResponse {
 		if ($roomType === Room::TYPE_ONE_TO_ONE) {
 			if ($invite === ''
@@ -744,23 +751,26 @@ public function createRoom(
 			$objectId = Room::OBJECT_ID_PHONE_OUTGOING;
 		}
 
+		$selectedPreset = Preset::from($preset ?? 0);
+
+
 		try {
 			$room = $this->roomService->createConversation(
-				$roomType,
+				$this->presetService->getDefaultForPreset($selectedPreset, Parameter::ROOM_TYPE, $roomType),
 				$roomName,
 				$user,
 				$objectType,
 				$objectId,
 				$password,
-				$readOnly,
-				$listable,
-				$messageExpiration,
-				$lobbyState,
+				$this->presetService->getDefaultForPreset($selectedPreset, Parameter::READ_ONLY, $readOnly),
+				$this->presetService->getDefaultForPreset($selectedPreset, Parameter::LISTABLE, $listable),
+				$this->presetService->getDefaultForPreset($selectedPreset, Parameter::MESSAGE_EXPIRATION, $messageExpiration),
+				$this->presetService->getDefaultForPreset($selectedPreset, Parameter::LOBBY_STATE, $lobbyState),
 				$lobbyTimer,
-				$sipEnabled,
-				$permissions,
-				$recordingConsent,
-				$mentionPermissions,
+				$this->presetService->getDefaultForPreset($selectedPreset, Parameter::SIP_ENABLED, $sipEnabled),
+				$this->presetService->getDefaultForPreset($selectedPreset, Parameter::PERMISSIONS, $permissions),
+				$this->presetService->getDefaultForPreset($selectedPreset, Parameter::RECORDING_CONSENT, $recordingConsent),
+				$this->presetService->getDefaultForPreset($selectedPreset, Parameter::MENTION_PERMISSIONS, $mentionPermissions),
 				$description,
 				$emoji,
 				$avatarColor,
diff --git a/lib/ResponseDefinitions.php b/lib/ResponseDefinitions.php
index 2de01080c14..e73c57b8476 100644
--- a/lib/ResponseDefinitions.php
+++ b/lib/ResponseDefinitions.php
@@ -580,6 +580,13 @@
  *     sendAt: int,
  *     silent: bool,
  * }
+ *
+ * @psalm-type TalkConversationPreset = {
+ *     // Identifier of the preset, currently known: default, webinar, presentation, hallway
+ *     id: string,
+ *     // Translated name of the preset in user's language
+ *     name: string,
+ * }
  */
 class ResponseDefinitions {
 }
diff --git a/lib/RoomPresets/DefaultPreset.php b/lib/RoomPresets/DefaultPreset.php
new file mode 100644
index 00000000000..020f74d1830
--- /dev/null
+++ b/lib/RoomPresets/DefaultPreset.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Talk\RoomPresets;
+
+use OCA\Talk\Model\Attendee;
+use OCA\Talk\Room;
+use OCA\Talk\Service\RecordingService;
+use OCA\Talk\Webinary;
+
+class DefaultPreset implements IPreset {
+	#[\Override]
+	public static function getDefault(Parameter $parameter): int {
+		return match ($parameter) {
+			Parameter::ROOM_TYPE => Room::TYPE_GROUP,
+			Parameter::READ_ONLY => Room::READ_WRITE,
+			Parameter::LISTABLE => Room::LISTABLE_NONE,
+			Parameter::MESSAGE_EXPIRATION => 0,
+			Parameter::LOBBY_STATE => Webinary::LOBBY_NONE,
+			Parameter::SIP_ENABLED => Webinary::SIP_DISABLED,
+			Parameter::PERMISSIONS => Attendee::PERMISSIONS_DEFAULT,
+			Parameter::RECORDING_CONSENT => RecordingService::CONSENT_REQUIRED_NO,
+			Parameter::MENTION_PERMISSIONS => Room::MENTION_PERMISSIONS_EVERYONE,
+		};
+	}
+}
diff --git a/lib/RoomPresets/Hallway.php b/lib/RoomPresets/Hallway.php
new file mode 100644
index 00000000000..17faf53bd11
--- /dev/null
+++ b/lib/RoomPresets/Hallway.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Talk\RoomPresets;
+
+use OCA\Talk\Room;
+
+class Hallway implements IPreset {
+	#[\Override]
+	public static function getDefault(Parameter $parameter): ?int {
+		return match ($parameter) {
+			// Users but no guest users (by default)
+			Parameter::LISTABLE => Room::LISTABLE_USERS,
+			// If you were not there, you were not there …
+			Parameter::MESSAGE_EXPIRATION => 3600,
+			default => null,
+		};
+	}
+}
diff --git a/lib/RoomPresets/IPreset.php b/lib/RoomPresets/IPreset.php
new file mode 100644
index 00000000000..9917606f3cc
--- /dev/null
+++ b/lib/RoomPresets/IPreset.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Talk\RoomPresets;
+
+interface IPreset {
+	public static function getDefault(Parameter $parameter): ?int;
+}
diff --git a/lib/RoomPresets/Parameter.php b/lib/RoomPresets/Parameter.php
new file mode 100644
index 00000000000..2f065546ffd
--- /dev/null
+++ b/lib/RoomPresets/Parameter.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Talk\RoomPresets;
+
+
+enum Parameter: string {
+	case ROOM_TYPE = 'roomType';
+	case READ_ONLY = 'readOnly';
+	case LISTABLE = 'listable';
+	case MESSAGE_EXPIRATION = 'messageExpiration';
+	case LOBBY_STATE = 'lobbyState';
+	case SIP_ENABLED = 'sipEnabled';
+	case PERMISSIONS = 'permissions';
+	case RECORDING_CONSENT = 'recordingConsent';
+	case MENTION_PERMISSIONS = 'mentionPermissions';
+}
diff --git a/lib/RoomPresets/Presentation.php b/lib/RoomPresets/Presentation.php
new file mode 100644
index 00000000000..cb72e7039bb
--- /dev/null
+++ b/lib/RoomPresets/Presentation.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Talk\RoomPresets;
+
+use OCA\Talk\Model\Attendee;
+use OCA\Talk\Room;
+use OCA\Talk\Service\RecordingService;
+
+class Presentation implements IPreset {
+	#[\Override]
+	public static function getDefault(Parameter $parameter): ?int {
+		return match ($parameter) {
+			Parameter::MENTION_PERMISSIONS => Room::MENTION_PERMISSIONS_MODERATORS,
+			Parameter::PERMISSIONS => Attendee::PERMISSIONS_CUSTOM
+				| Attendee::PERMISSIONS_CALL_JOIN
+				| Attendee::PERMISSIONS_CHAT,
+			Parameter::RECORDING_CONSENT => RecordingService::CONSENT_REQUIRED_YES,
+			default => null,
+		};
+	}
+}
diff --git a/lib/RoomPresets/Preset.php b/lib/RoomPresets/Preset.php
new file mode 100644
index 00000000000..af754970cbb
--- /dev/null
+++ b/lib/RoomPresets/Preset.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Talk\RoomPresets;
+
+
+enum Preset: int {
+	case DEFAULT = 0;
+	case WEBINAR = 1;
+	case PRESENTATION = 2;
+	case HALLWAY = 3;
+}
diff --git a/lib/RoomPresets/Webinar.php b/lib/RoomPresets/Webinar.php
new file mode 100644
index 00000000000..f828dbd53ef
--- /dev/null
+++ b/lib/RoomPresets/Webinar.php
@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Talk\RoomPresets;
+
+use OCA\Talk\Model\Attendee;
+use OCA\Talk\Room;
+use OCA\Talk\Service\RecordingService;
+use OCA\Talk\Webinary;
+
+class Webinar implements IPreset {
+	#[\Override]
+	public static function getDefault(Parameter $parameter): ?int {
+		return match ($parameter) {
+			Parameter::LOBBY_STATE => Webinary::LOBBY_NON_MODERATORS,
+			Parameter::MESSAGE_EXPIRATION => Room::MENTION_PERMISSIONS_MODERATORS,
+			Parameter::PERMISSIONS => Attendee::PERMISSIONS_CUSTOM
+				| Attendee::PERMISSIONS_CALL_JOIN
+				| Attendee::PERMISSIONS_CHAT,
+			Parameter::RECORDING_CONSENT => RecordingService::CONSENT_REQUIRED_YES,
+			Parameter::ROOM_TYPE => Room::TYPE_PUBLIC,
+			default => null,
+		};
+	}
+}
diff --git a/lib/Service/RoomPresetService.php b/lib/Service/RoomPresetService.php
new file mode 100644
index 00000000000..9d22bba2884
--- /dev/null
+++ b/lib/Service/RoomPresetService.php
@@ -0,0 +1,79 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Talk\Service;
+
+use OCA\Talk\RoomPresets\DefaultPreset;
+use OCA\Talk\RoomPresets\Hallway;
+use OCA\Talk\RoomPresets\Parameter;
+use OCA\Talk\RoomPresets\Presentation;
+use OCA\Talk\RoomPresets\Preset;
+use OCA\Talk\RoomPresets\Webinar;
+use OCP\AppFramework\Services\IAppConfig;
+
+class RoomPresetService {
+	public const CONFIG_PREFIX_DEFAULT = 'default_';
+	public const CONFIG_PREFIX_FORCE = 'force_';
+
+	public function __construct(
+		protected readonly IAppConfig $appConfig,
+	) {
+	}
+
+	/**
+	 * Order of priority:
+	 * 1. App config `force_`
+	 * 2. User provided value
+	 * 3. Preset value
+	 * 4. App config `default_`
+	 * 5. Source code default
+	 */
+	public function getDefaultForPreset(Preset $preset, Parameter $parameter, ?int $provided): int {
+		$configName = self::getConfigNameForParameter($parameter);
+		if ($this->appConfig->hasAppKey(self::CONFIG_PREFIX_FORCE . $configName)) {
+			return $this->appConfig->getAppValueInt(self::CONFIG_PREFIX_FORCE . $configName);
+		}
+
+		if ($provided !== null) {
+			return $provided;
+		}
+
+		$value = match ($preset) {
+			Preset::WEBINAR => Webinar::getDefault($parameter),
+			Preset::PRESENTATION => Presentation::getDefault($parameter),
+			Preset::HALLWAY => Hallway::getDefault($parameter),
+			default => null,
+		};
+
+		if ($value !== null) {
+			return $value;
+		}
+
+		if ($this->appConfig->hasAppKey(self::CONFIG_PREFIX_DEFAULT . $configName)) {
+			return $this->appConfig->getAppValueInt(self::CONFIG_PREFIX_DEFAULT . $configName);
+		}
+
+		// Fall through to default preset
+		return DefaultPreset::getDefault($parameter);
+	}
+
+	public static function getConfigNameForParameter(Parameter $parameter): string {
+		$parts = preg_split('/(?=[A-Z])/', $parameter->value);
+
+		$configName = '';
+		foreach ($parts as $part) {
+			if ($configName === '') {
+				$configName = $part;
+			} else {
+				$configName .= '_' . lcfirst($part);
+			}
+		}
+
+		return $configName;
+	}
+}
diff --git a/openapi-full.json b/openapi-full.json
index ad06be8aa82..9ff2d94d6b2 100644
--- a/openapi-full.json
+++ b/openapi-full.json
@@ -15891,6 +15891,8 @@
                                     "roomType": {
                                         "type": "integer",
                                         "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "description": "Type of the room"
                                     },
                                     "invite": {
@@ -15927,7 +15929,8 @@
                                     },
                                     "readOnly": {
                                         "type": "integer",
-                                        "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "enum": [
                                             0,
                                             1
@@ -15936,7 +15939,8 @@
                                     },
                                     "listable": {
                                         "type": "integer",
-                                        "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "enum": [
                                             0,
                                             1,
@@ -15947,13 +15951,15 @@
                                     "messageExpiration": {
                                         "type": "integer",
                                         "format": "int64",
-                                        "default": 0,
+                                        "nullable": true,
+                                        "default": null,
                                         "description": "Seconds after which messages will disappear, 0 disables expiration (Default 0) (only available with `conversation-creation-all` capability)",
                                         "minimum": 0
                                     },
                                     "lobbyState": {
                                         "type": "integer",
-                                        "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "enum": [
                                             0,
                                             1
@@ -15970,7 +15976,8 @@
                                     },
                                     "sipEnabled": {
                                         "type": "integer",
-                                        "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "enum": [
                                             0,
                                             1,
@@ -15981,13 +15988,16 @@
                                     "permissions": {
                                         "type": "integer",
                                         "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "description": "Default permissions for participants (only available with `conversation-creation-all` capability)",
                                         "minimum": 0,
                                         "maximum": 255
                                     },
                                     "recordingConsent": {
                                         "type": "integer",
-                                        "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "enum": [
                                             0,
                                             1
@@ -15996,7 +16006,8 @@
                                     },
                                     "mentionPermissions": {
                                         "type": "integer",
-                                        "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "enum": [
                                             0,
                                             1
@@ -16026,6 +16037,18 @@
                                         "$ref": "#/components/schemas/InvitationList",
                                         "default": [],
                                         "description": "List of participants to add grouped by type (only available with `conversation-creation-all` capability)"
+                                    },
+                                    "preset": {
+                                        "type": "integer",
+                                        "nullable": true,
+                                        "default": null,
+                                        "enum": [
+                                            0,
+                                            1,
+                                            2,
+                                            3
+                                        ],
+                                        "description": "Which preset should be used for not-given (null) parameters (only available with `conversation-preset` capability)"
                                     }
                                 }
                             }
diff --git a/openapi.json b/openapi.json
index 936e587ca6e..b4ff4933560 100644
--- a/openapi.json
+++ b/openapi.json
@@ -15796,6 +15796,8 @@
                                     "roomType": {
                                         "type": "integer",
                                         "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "description": "Type of the room"
                                     },
                                     "invite": {
@@ -15832,7 +15834,8 @@
                                     },
                                     "readOnly": {
                                         "type": "integer",
-                                        "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "enum": [
                                             0,
                                             1
@@ -15841,7 +15844,8 @@
                                     },
                                     "listable": {
                                         "type": "integer",
-                                        "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "enum": [
                                             0,
                                             1,
@@ -15852,13 +15856,15 @@
                                     "messageExpiration": {
                                         "type": "integer",
                                         "format": "int64",
-                                        "default": 0,
+                                        "nullable": true,
+                                        "default": null,
                                         "description": "Seconds after which messages will disappear, 0 disables expiration (Default 0) (only available with `conversation-creation-all` capability)",
                                         "minimum": 0
                                     },
                                     "lobbyState": {
                                         "type": "integer",
-                                        "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "enum": [
                                             0,
                                             1
@@ -15875,7 +15881,8 @@
                                     },
                                     "sipEnabled": {
                                         "type": "integer",
-                                        "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "enum": [
                                             0,
                                             1,
@@ -15886,13 +15893,16 @@
                                     "permissions": {
                                         "type": "integer",
                                         "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "description": "Default permissions for participants (only available with `conversation-creation-all` capability)",
                                         "minimum": 0,
                                         "maximum": 255
                                     },
                                     "recordingConsent": {
                                         "type": "integer",
-                                        "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "enum": [
                                             0,
                                             1
@@ -15901,7 +15911,8 @@
                                     },
                                     "mentionPermissions": {
                                         "type": "integer",
-                                        "format": "int64",
+                                        "nullable": true,
+                                        "default": null,
                                         "enum": [
                                             0,
                                             1
@@ -15931,6 +15942,18 @@
                                         "$ref": "#/components/schemas/InvitationList",
                                         "default": [],
                                         "description": "List of participants to add grouped by type (only available with `conversation-creation-all` capability)"
+                                    },
+                                    "preset": {
+                                        "type": "integer",
+                                        "nullable": true,
+                                        "default": null,
+                                        "enum": [
+                                            0,
+                                            1,
+                                            2,
+                                            3
+                                        ],
+                                        "description": "Which preset should be used for not-given (null) parameters (only available with `conversation-preset` capability)"
                                     }
                                 }
                             }
diff --git a/src/types/openapi/openapi-full.ts b/src/types/openapi/openapi-full.ts
index 0f6b41369da..e3590939c45 100644
--- a/src/types/openapi/openapi-full.ts
+++ b/src/types/openapi/openapi-full.ts
@@ -8560,8 +8560,9 @@ export interface operations {
                     /**
                      * Format: int64
                      * @description Type of the room
+                     * @default null
                      */
-                    roomType?: number;
+                    roomType?: number | null;
                     /**
                      * @deprecated
                      * @description User, group, … ID to invite Deprecated: Use the `$participants` array instead
@@ -8595,29 +8596,29 @@ export interface operations {
                      */
                     password?: string;
                     /**
-                     * Format: int64
                      * @description Read only state of the conversation (Default writable) (only available with `conversation-creation-all` capability)
-                     * @enum {integer}
+                     * @default null
+                     * @enum {integer|null}
                      */
-                    readOnly?: 0 | 1;
+                    readOnly?: 0 | 1 | null;
                     /**
-                     * Format: int64
                      * @description Scope where the conversation is listable (Default not listable for anyone) (only available with `conversation-creation-all` capability)
-                     * @enum {integer}
+                     * @default null
+                     * @enum {integer|null}
                      */
-                    listable?: 0 | 1 | 2;
+                    listable?: 0 | 1 | 2 | null;
                     /**
                      * Format: int64
                      * @description Seconds after which messages will disappear, 0 disables expiration (Default 0) (only available with `conversation-creation-all` capability)
-                     * @default 0
+                     * @default null
                      */
-                    messageExpiration?: number;
+                    messageExpiration?: number | null;
                     /**
-                     * Format: int64
                      * @description Lobby state of the conversation (Default lobby is disabled) (only available with `conversation-creation-all` capability)
-                     * @enum {integer}
+                     * @default null
+                     * @enum {integer|null}
                      */
-                    lobbyState?: 0 | 1;
+                    lobbyState?: 0 | 1 | null;
                     /**
                      * Format: int64
                      * @description Timer when the lobby will be removed (Default null, will not be disabled automatically) (only available with `conversation-creation-all` capability)
@@ -8625,28 +8626,29 @@ export interface operations {
                      */
                     lobbyTimer?: number | null;
                     /**
-                     * Format: int64
                      * @description Whether SIP dial-in shall be enabled (only available with `conversation-creation-all` capability)
-                     * @enum {integer}
+                     * @default null
+                     * @enum {integer|null}
                      */
-                    sipEnabled?: 0 | 1 | 2;
+                    sipEnabled?: 0 | 1 | 2 | null;
                     /**
                      * Format: int64
                      * @description Default permissions for participants (only available with `conversation-creation-all` capability)
+                     * @default null
                      */
-                    permissions?: number;
+                    permissions?: number | null;
                     /**
-                     * Format: int64
                      * @description Whether participants need to agree to a recording before joining a call (only available with `conversation-creation-all` capability)
-                     * @enum {integer}
+                     * @default null
+                     * @enum {integer|null}
                      */
-                    recordingConsent?: 0 | 1;
+                    recordingConsent?: 0 | 1 | null;
                     /**
-                     * Format: int64
                      * @description Who can mention at-all in the chat (only available with `conversation-creation-all` capability)
-                     * @enum {integer}
+                     * @default null
+                     * @enum {integer|null}
                      */
-                    mentionPermissions?: 0 | 1;
+                    mentionPermissions?: 0 | 1 | null;
                     /**
                      * @description Description for the conversation (limited to 2.000 characters) (only available with `conversation-creation-all` capability)
                      * @default
@@ -8667,6 +8669,12 @@ export interface operations {
                      * @default []
                      */
                     participants?: components["schemas"]["InvitationList"];
+                    /**
+                     * @description Which preset should be used for not-given (null) parameters (only available with `conversation-preset` capability)
+                     * @default null
+                     * @enum {integer|null}
+                     */
+                    preset?: 0 | 1 | 2 | 3 | null;
                 };
             };
         };
diff --git a/src/types/openapi/openapi.ts b/src/types/openapi/openapi.ts
index 9529b534d76..cbdf1bc6b8d 100644
--- a/src/types/openapi/openapi.ts
+++ b/src/types/openapi/openapi.ts
@@ -8022,8 +8022,9 @@ export interface operations {
                     /**
                      * Format: int64
                      * @description Type of the room
+                     * @default null
                      */
-                    roomType?: number;
+                    roomType?: number | null;
                     /**
                      * @deprecated
                      * @description User, group, … ID to invite Deprecated: Use the `$participants` array instead
@@ -8057,29 +8058,29 @@ export interface operations {
                      */
                     password?: string;
                     /**
-                     * Format: int64
                      * @description Read only state of the conversation (Default writable) (only available with `conversation-creation-all` capability)
-                     * @enum {integer}
+                     * @default null
+                     * @enum {integer|null}
                      */
-                    readOnly?: 0 | 1;
+                    readOnly?: 0 | 1 | null;
                     /**
-                     * Format: int64
                      * @description Scope where the conversation is listable (Default not listable for anyone) (only available with `conversation-creation-all` capability)
-                     * @enum {integer}
+                     * @default null
+                     * @enum {integer|null}
                      */
-                    listable?: 0 | 1 | 2;
+                    listable?: 0 | 1 | 2 | null;
                     /**
                      * Format: int64
                      * @description Seconds after which messages will disappear, 0 disables expiration (Default 0) (only available with `conversation-creation-all` capability)
-                     * @default 0
+                     * @default null
                      */
-                    messageExpiration?: number;
+                    messageExpiration?: number | null;
                     /**
-                     * Format: int64
                      * @description Lobby state of the conversation (Default lobby is disabled) (only available with `conversation-creation-all` capability)
-                     * @enum {integer}
+                     * @default null
+                     * @enum {integer|null}
                      */
-                    lobbyState?: 0 | 1;
+                    lobbyState?: 0 | 1 | null;
                     /**
                      * Format: int64
                      * @description Timer when the lobby will be removed (Default null, will not be disabled automatically) (only available with `conversation-creation-all` capability)
@@ -8087,28 +8088,29 @@ export interface operations {
                      */
                     lobbyTimer?: number | null;
                     /**
-                     * Format: int64
                      * @description Whether SIP dial-in shall be enabled (only available with `conversation-creation-all` capability)
-                     * @enum {integer}
+                     * @default null
+                     * @enum {integer|null}
                      */
-                    sipEnabled?: 0 | 1 | 2;
+                    sipEnabled?: 0 | 1 | 2 | null;
                     /**
                      * Format: int64
                      * @description Default permissions for participants (only available with `conversation-creation-all` capability)
+                     * @default null
                      */
-                    permissions?: number;
+                    permissions?: number | null;
                     /**
-                     * Format: int64
                      * @description Whether participants need to agree to a recording before joining a call (only available with `conversation-creation-all` capability)
-                     * @enum {integer}
+                     * @default null
+                     * @enum {integer|null}
                      */
-                    recordingConsent?: 0 | 1;
+                    recordingConsent?: 0 | 1 | null;
                     /**
-                     * Format: int64
                      * @description Who can mention at-all in the chat (only available with `conversation-creation-all` capability)
-                     * @enum {integer}
+                     * @default null
+                     * @enum {integer|null}
                      */
-                    mentionPermissions?: 0 | 1;
+                    mentionPermissions?: 0 | 1 | null;
                     /**
                      * @description Description for the conversation (limited to 2.000 characters) (only available with `conversation-creation-all` capability)
                      * @default
@@ -8129,6 +8131,12 @@ export interface operations {
                      * @default []
                      */
                     participants?: components["schemas"]["InvitationList"];
+                    /**
+                     * @description Which preset should be used for not-given (null) parameters (only available with `conversation-preset` capability)
+                     * @default null
+                     * @enum {integer|null}
+                     */
+                    preset?: 0 | 1 | 2 | 3 | null;
                 };
             };
         };