diff --git a/lib/ConfigLexicon.php b/lib/ConfigLexicon.php
index d5367ee8324..c2396049666 100644
--- a/lib/ConfigLexicon.php
+++ b/lib/ConfigLexicon.php
@@ -226,6 +226,7 @@ public function getAppConfigs(): array {
 			new Entry(Config::HOSTED_SIGNALING_SERVER_NONCE, ValueType::STRING, '', definition: 'Temporary nonce while configuring the hosted signaling server', flags: IAppConfig::FLAG_SENSITIVE, rename: 'hosted-signaling-server-nonce'),
 			new Entry(Config::HOSTED_SIGNALING_SERVER_ACCOUNT_ID, ValueType::STRING, '', definition: 'Account identifier of the hosted signaling server', flags: IAppConfig::FLAG_SENSITIVE, rename: 'hosted-signaling-server-account-id'),
 			new Entry(Config::SIP_BRIDGE_DIALIN_INFO, ValueType::STRING, '', definition: 'Additional information added in the SIP dial-in invitation mail and sidebar', flags: IAppConfig::FLAG_SENSITIVE),
+			new Entry(Config::SIP_DIALIN_DEFAULT, ValueType::INT, 0, definition: 'Default value of SIP dial-in when creating new conversations'),
 			new Entry(Config::SIP_BRIDGE_DIALOUT_ANONYMOUS, ValueType::BOOL, false, definition: 'When set to true, all out-going SIP calls will be anonymous calls (CLIR)'),
 			new Entry(Config::SIP_BRIDGE_DIALOUT_NUMBER, ValueType::STRING, '', definition: 'Fallback phone number that is used as caller for out-going calls when the user has no phone-number configured (has to be E164 `+49123456789` formatted'),
 			new Entry(Config::SIP_BRIDGE_DIALOUT_PREFIX, ValueType::STRING, '+', definition: 'Deprecated: Only used for direct dial-in from older SIP bridges, which send phone numbers without this prefix', deprecated: true),
diff --git a/lib/Controller/RoomController.php b/lib/Controller/RoomController.php
index d2721066bfe..fd7614ef3b4 100644
--- a/lib/Controller/RoomController.php
+++ b/lib/Controller/RoomController.php
@@ -189,7 +189,7 @@ public function __construct(
 	protected function getTalkHashHeader(): array {
 		$values = [
 			$this->config->getSystemValueString('version'),
-			$this->config->getAppValue('spreed', 'installed_version'),
+			$this->appConfig->getAppValueString('installed_version'),
 			json_encode($this->appConfig->getAppValueArray(Config::STUN_SERVERS)),
 			json_encode($this->appConfig->getAppValueArray(Config::TURN_SERVERS)),
 			json_encode($this->appConfig->getAppValueArray(Config::SIGNALING_SERVERS)),
diff --git a/lib/Listener/GroupDeletedListener.php b/lib/Listener/GroupDeletedListener.php
index 919352700d4..cbfc775140b 100644
--- a/lib/Listener/GroupDeletedListener.php
+++ b/lib/Listener/GroupDeletedListener.php
@@ -13,18 +13,16 @@
 use OCA\Talk\Manager;
 use OCA\Talk\Model\Attendee;
 use OCA\Talk\Service\ParticipantService;
+use OCP\AppFramework\Services\IAppConfig;
 use OCP\EventDispatcher\Event;
 use OCP\EventDispatcher\IEventListener;
 use OCP\Group\Events\GroupDeletedEvent;
-use OCP\IAppConfig;
-use OCP\IConfig;
 
 /**
  * @template-implements IEventListener<Event>
  */
 class GroupDeletedListener implements IEventListener {
 	public function __construct(
-		private readonly IConfig $config,
 		private readonly Manager $manager,
 		private readonly ParticipantService $participantService,
 		private readonly IAppConfig $appConfig,
@@ -54,12 +52,10 @@ public function handle(Event $event): void {
 	}
 
 	protected function removeGroupFromConfig(string $configKey, string $removeGroupId): void {
-		$json = $this->config->getAppValue('spreed', $configKey, '[]');
-		$array = json_decode($json, true);
-		$gids = \is_array($array) ? $array : [];
+		$gids = $this->appConfig->getAppValueArray($configKey);
 
 		$gids = array_filter($gids, static fn ($gid) => $gid !== $removeGroupId);
 
-		$this->config->setAppValue('spreed', $configKey, json_encode($gids));
+		$this->appConfig->setAppValueArray($configKey, $gids);
 	}
 }
diff --git a/lib/Manager.php b/lib/Manager.php
index 5f681662c75..8ec2179278d 100644
--- a/lib/Manager.php
+++ b/lib/Manager.php
@@ -1267,13 +1267,11 @@ public function createRoom(
 			}
 		}
 		if ($sipEnabled === null) {
-			$default = $this->config->getAppValue('spreed', 'sip_dialin_default', 'none');
-			if ($default !== 'none') {
-				$default = (int)$default;
-				if (in_array($default, [Webinary::SIP_DISABLED, Webinary::SIP_ENABLED, Webinary::SIP_ENABLED_NO_PIN], true)) {
-					$sipEnabled = $default;
-				}
+			$default = $this->appConfig->getAppValueInt(Config::SIP_DIALIN_DEFAULT);
+			if (in_array($default, [Webinary::SIP_DISABLED, Webinary::SIP_ENABLED, Webinary::SIP_ENABLED_NO_PIN], true)) {
+				$sipEnabled = $default;
 			}
+
 		}
 		if ($sipEnabled !== null) {
 			$insert->setValue('sip_enabled', $insert->createNamedParameter($sipEnabled, IQueryBuilder::PARAM_INT));
diff --git a/lib/Migration/ClearResourceAccessCache.php b/lib/Migration/ClearResourceAccessCache.php
index 79a29bd4587..617fc05ac7e 100644
--- a/lib/Migration/ClearResourceAccessCache.php
+++ b/lib/Migration/ClearResourceAccessCache.php
@@ -9,8 +9,8 @@
 namespace OCA\Talk\Migration;
 
 use OCA\Talk\Collaboration\Resources\ConversationProvider;
+use OCP\AppFramework\Services\IAppConfig;
 use OCP\Collaboration\Resources\IManager;
-use OCP\IConfig;
 use OCP\Migration\IOutput;
 use OCP\Migration\IRepairStep;
 
@@ -18,7 +18,7 @@ class ClearResourceAccessCache implements IRepairStep {
 	protected const INVALIDATIONS = 1;
 
 	public function __construct(
-		private readonly IConfig $config,
+		private readonly IAppConfig $appConfig,
 		private readonly IManager $manager,
 		private readonly ConversationProvider $provider,
 	) {
@@ -31,7 +31,7 @@ public function getName(): string {
 
 	#[\Override]
 	public function run(IOutput $output): void {
-		$invalidatedCache = (int)$this->config->getAppValue('spreed', 'project_access_invalidated', '0');
+		$invalidatedCache = $this->appConfig->getAppValueInt('project_access_invalidated', 0);
 
 		if ($invalidatedCache === self::INVALIDATIONS) {
 			$output->info('Invalidation not required');
@@ -39,6 +39,6 @@ public function run(IOutput $output): void {
 		}
 
 		$this->manager->invalidateAccessCacheForProvider($this->provider);
-		$this->config->setAppValue('spreed', 'project_access_invalidated', (string)self::INVALIDATIONS);
+		$this->appConfig->setAppValueInt('project_access_invalidated', self::INVALIDATIONS);
 	}
 }
diff --git a/lib/Migration/Version14000Date20220217115327.php b/lib/Migration/Version14000Date20220217115327.php
index b8641394fb9..252a071628e 100644
--- a/lib/Migration/Version14000Date20220217115327.php
+++ b/lib/Migration/Version14000Date20220217115327.php
@@ -9,7 +9,7 @@
 namespace OCA\Talk\Migration;
 
 use Closure;
-use OCP\IConfig;
+use OCP\AppFramework\Services\IAppConfig;
 use OCP\Migration\Attributes\DataCleansing;
 use OCP\Migration\IOutput;
 use OCP\Migration\SimpleMigrationStep;
@@ -18,7 +18,7 @@
 class Version14000Date20220217115327 extends SimpleMigrationStep {
 
 	public function __construct(
-		private readonly IConfig $config,
+		private readonly IAppConfig $appConfig,
 	) {
 	}
 
@@ -29,6 +29,6 @@ public function __construct(
 	 */
 	#[\Override]
 	public function preSchemaChange(IOutput $output, Closure $schemaClosure, array $options): void {
-		$this->config->deleteAppValue('spreed', 'hosted-signaling-server-account-last-checked');
+		$this->appConfig->deleteAppValue('hosted-signaling-server-account-last-checked');
 	}
 }
diff --git a/lib/Migration/Version2000Date20171026140256.php b/lib/Migration/Version2000Date20171026140256.php
index 63bf0091ba8..8a05bfc2dae 100644
--- a/lib/Migration/Version2000Date20171026140256.php
+++ b/lib/Migration/Version2000Date20171026140256.php
@@ -8,8 +8,8 @@
 
 namespace OCA\Talk\Migration;
 
+use OCP\AppFramework\Services\IAppConfig;
 use OCP\DB\QueryBuilder\IQueryBuilder;
-use OCP\IConfig;
 use OCP\IDBConnection;
 use OCP\IGroupManager;
 use OCP\Migration\Attributes\DataCleansing;
@@ -21,7 +21,7 @@ class Version2000Date20171026140256 extends SimpleMigrationStep {
 
 	public function __construct(
 		private readonly IDBConnection $connection,
-		private readonly IConfig $config,
+		private readonly IAppConfig $appConfig,
 		private readonly IGroupManager $groupManager,
 	) {
 	}
@@ -34,7 +34,7 @@ public function __construct(
 	 */
 	#[\Override]
 	public function postSchemaChange(IOutput $output, \Closure $schemaClosure, array $options): void {
-		if (version_compare($this->config->getAppValue('spreed', 'installed_version', '0.0.0'), '2.0.0', '<')) {
+		if (version_compare($this->appConfig->getAppValueString('installed_version', '0.0.0'), '2.0.0', '<')) {
 			// Migrations only work after 2.0.0
 			return;
 		}
diff --git a/lib/Migration/Version2000Date20171026140257.php b/lib/Migration/Version2000Date20171026140257.php
index 6da95b8c2f3..426c3f807a9 100644
--- a/lib/Migration/Version2000Date20171026140257.php
+++ b/lib/Migration/Version2000Date20171026140257.php
@@ -11,7 +11,6 @@
 use OCA\Talk\Config;
 use OCP\AppFramework\Services\IAppConfig;
 use OCP\DB\QueryBuilder\IQueryBuilder;
-use OCP\IConfig;
 use OCP\IDBConnection;
 use OCP\Migration\Attributes\DataCleansing;
 use OCP\Migration\IOutput;
@@ -26,7 +25,6 @@ class Version2000Date20171026140257 extends SimpleMigrationStep {
 
 	public function __construct(
 		private readonly IDBConnection $connection,
-		private readonly IConfig $config,
 		private readonly IAppConfig $appConfig,
 		private readonly ISecureRandom $secureRandom,
 	) {
@@ -41,7 +39,7 @@ public function __construct(
 	 */
 	#[\Override]
 	public function postSchemaChange(IOutput $output, \Closure $schemaClosure, array $options): void {
-		if (version_compare($this->config->getAppValue('spreed', 'installed_version', '0.0.0'), '2.0.0', '<')) {
+		if (version_compare($this->appConfig->getAppValueString('installed_version', '0.0.0'), '2.0.0', '<')) {
 			// Migrations only work after 2.0.0
 			return;
 		}
diff --git a/lib/Migration/Version2001Date20170707115443.php b/lib/Migration/Version2001Date20170707115443.php
index c0463c15e80..60e5658a112 100644
--- a/lib/Migration/Version2001Date20170707115443.php
+++ b/lib/Migration/Version2001Date20170707115443.php
@@ -10,10 +10,10 @@
 
 use OCA\Talk\Participant;
 use OCA\Talk\Room;
+use OCP\AppFramework\Services\IAppConfig;
 use OCP\DB\ISchemaWrapper;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\DB\Types;
-use OCP\IConfig;
 use OCP\IDBConnection;
 use OCP\Migration\Attributes\AddColumn;
 use OCP\Migration\Attributes\ColumnType;
@@ -27,7 +27,7 @@ class Version2001Date20170707115443 extends SimpleMigrationStep {
 
 	public function __construct(
 		private readonly IDBConnection $db,
-		private readonly IConfig $config,
+		private readonly IAppConfig $appConfig,
 	) {
 	}
 
@@ -63,7 +63,7 @@ public function changeSchema(IOutput $output, \Closure $schemaClosure, array $op
 	 */
 	#[\Override]
 	public function postSchemaChange(IOutput $output, \Closure $schemaClosure, array $options): void {
-		if (version_compare($this->config->getAppValue('spreed', 'installed_version', '0.0.0'), '2.0.0', '<')) {
+		if (version_compare($this->appConfig->getAppValueString('installed_version', '0.0.0'), '2.0.0', '<')) {
 			// Migrations only work after 2.0.0
 			return;
 		}
diff --git a/lib/Migration/Version2001Date20171026134605.php b/lib/Migration/Version2001Date20171026134605.php
index 98ca37b934e..fdfee784fab 100644
--- a/lib/Migration/Version2001Date20171026134605.php
+++ b/lib/Migration/Version2001Date20171026134605.php
@@ -10,10 +10,10 @@
 
 use Doctrine\DBAL\Exception\InvalidFieldNameException;
 use Doctrine\DBAL\Exception\TableNotFoundException;
+use OCP\AppFramework\Services\IAppConfig;
 use OCP\DB\ISchemaWrapper;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\DB\Types;
-use OCP\IConfig;
 use OCP\IDBConnection;
 use OCP\Migration\Attributes\CreateTable;
 use OCP\Migration\Attributes\DataCleansing;
@@ -31,7 +31,7 @@ class Version2001Date20171026134605 extends SimpleMigrationStep {
 
 	public function __construct(
 		private readonly IDBConnection $connection,
-		private readonly IConfig $config,
+		private readonly IAppConfig $appConfig,
 	) {
 	}
 
@@ -152,7 +152,7 @@ public function changeSchema(IOutput $output, \Closure $schemaClosure, array $op
 	 */
 	#[\Override]
 	public function postSchemaChange(IOutput $output, \Closure $schemaClosure, array $options): void {
-		if (version_compare($this->config->getAppValue('spreed', 'installed_version', '0.0.0'), '2.0.0', '<')) {
+		if (version_compare($this->appConfig->getAppValueString('installed_version', '0.0.0'), '2.0.0', '<')) {
 			// Migrations only work after 2.0.0
 			return;
 		}
diff --git a/lib/Migration/Version2001Date20180103144447.php b/lib/Migration/Version2001Date20180103144447.php
index 2231df64892..67a3b05846c 100644
--- a/lib/Migration/Version2001Date20180103144447.php
+++ b/lib/Migration/Version2001Date20180103144447.php
@@ -8,9 +8,9 @@
 
 namespace OCA\Talk\Migration;
 
+use OCP\AppFramework\Services\IAppConfig;
 use OCP\DB\ISchemaWrapper;
 use OCP\DB\Types;
-use OCP\IConfig;
 use OCP\IDBConnection;
 use OCP\Migration\Attributes\AddColumn;
 use OCP\Migration\Attributes\ColumnType;
@@ -32,7 +32,7 @@ class Version2001Date20180103144447 extends SimpleMigrationStep {
 
 	public function __construct(
 		private readonly IDBConnection $connection,
-		private readonly IConfig $config,
+		private readonly IAppConfig $appConfig,
 	) {
 	}
 
@@ -108,7 +108,7 @@ public function changeSchema(IOutput $output, \Closure $schemaClosure, array $op
 	 */
 	#[\Override]
 	public function postSchemaChange(IOutput $output, \Closure $schemaClosure, array $options): void {
-		if (version_compare($this->config->getAppValue('spreed', 'installed_version', '0.0.0'), '2.0.0', '<')) {
+		if (version_compare($this->appConfig->getAppValueString('installed_version', '0.0.0'), '2.0.0', '<')) {
 			// Migrations only work after 2.0.0
 			return;
 		}
diff --git a/lib/Settings/Admin/AdminSettings.php b/lib/Settings/Admin/AdminSettings.php
index 83e237c7ccb..15137df3177 100644
--- a/lib/Settings/Admin/AdminSettings.php
+++ b/lib/Settings/Admin/AdminSettings.php
@@ -69,9 +69,9 @@ public function getForm(): TemplateResponse {
 	}
 
 	protected function initGeneralSettings(): void {
-		$this->initialState->provideInitialState(Config::DEFAULT_GROUP_NOTIFICATION, $this->appConfig->getAppValueInt(Config::DEFAULT_GROUP_NOTIFICATION));
-		$this->initialState->provideInitialState(Config::CONVERSATIONS_FILES, (int)$this->appConfig->getAppValueBool(Config::CONVERSATIONS_FILES));
-		$this->initialState->provideInitialState(Config::CONVERSATIONS_FILES_PUBLIC_SHARES, (int)$this->appConfig->getAppValueBool(Config::CONVERSATIONS_FILES_PUBLIC_SHARES));
+		$this->initialState->provideInitialState('default_group_notification', $this->appConfig->getAppValueInt(Config::DEFAULT_GROUP_NOTIFICATION));
+		$this->initialState->provideInitialState('conversations_files', (int)$this->appConfig->getAppValueBool(Config::CONVERSATIONS_FILES));
+		$this->initialState->provideInitialState('conversations_files_public_shares', (int)$this->appConfig->getAppValueBool(Config::CONVERSATIONS_FILES_PUBLIC_SHARES));
 		$this->initialState->provideInitialState('valid_apache_php_configuration', $this->validApachePHPConfiguration());
 	}
 
@@ -486,7 +486,7 @@ protected function getGroupDetailsArray(array $gids, string $configKey): array {
 
 		if (count($gids) !== count($groups)) {
 			$gids = array_map(static fn (array $group) => $group['id'], $groups);
-			$this->serverConfig->setAppValue('spreed', $configKey, json_encode($gids));
+			$this->appConfig->setAppValueArray($configKey, $gids);
 		}
 
 		return $groups;