diff --git a/lib/Controller/RoomController.php b/lib/Controller/RoomController.php
index f44371f8ccb..3ee882672cb 100644
--- a/lib/Controller/RoomController.php
+++ b/lib/Controller/RoomController.php
@@ -1660,6 +1660,10 @@ public function joinRoom(string $token, string $password = '', bool $force = tru
 				return new DataResponse([], Http::STATUS_NOT_FOUND);
 			}
 
+			/** @var TalkRoom $data */
+			$data = $response->getData();
+
+
 			$proxyHeaders = $response->getHeaders();
 			if (isset($proxyHeaders['X-Nextcloud-Talk-Proxy-Hash'])) {
 				$headers['X-Nextcloud-Talk-Proxy-Hash'] = $proxyHeaders['X-Nextcloud-Talk-Proxy-Hash'];
@@ -1675,8 +1679,8 @@ public function joinRoom(string $token, string $password = '', bool $force = tru
 	 * The session id can be null only for requests from Talk < 20.
 	 *
 	 * @param string $token Token of the room
-	 * @param string $sessionId Federated session id to join with
-	 * @return DataResponse<Http::STATUS_OK, array<empty>, array{X-Nextcloud-Talk-Hash: string}>|DataResponse<Http::STATUS_NOT_FOUND, null, array{}>
+	 * @param ?string $sessionId Federated session id to join with
+	 * @return DataResponse<Http::STATUS_OK, TalkRoom, array{X-Nextcloud-Talk-Hash: string}>|DataResponse<Http::STATUS_NOT_FOUND, null, array{}>
 	 *
 	 * 200: Federated user joined the room
 	 * 404: Room not found
@@ -1711,14 +1715,16 @@ public function joinFederatedRoom(string $token, ?string $sessionId): DataRespon
 				if ($session instanceof Session) {
 					$this->sessionService->updateLastPing($session, $this->timeFactory->getTime());
 				}
+			} else {
+				$participant = $this->participantService->getParticipantByActor($room, Attendee::ACTOR_FEDERATED_USERS, $this->federationAuthenticator->getCloudId());
 			}
 
 			// Let the clients know if they need to reload capabilities
 			$capabilities = $this->capabilities->getCapabilities();
-			return new DataResponse([], Http::STATUS_OK, [
+			return new DataResponse($this->formatRoom($room, $participant), Http::STATUS_OK, [
 				'X-Nextcloud-Talk-Hash' => sha1(json_encode($capabilities)),
 			]);
-		} catch (RoomNotFoundException|UnauthorizedException) {
+		} catch (RoomNotFoundException|ParticipantNotFoundException|UnauthorizedException) {
 			$response = new DataResponse(null, Http::STATUS_NOT_FOUND);
 			$response->throttle(['token' => $token, 'action' => 'talkFederationAccess']);
 			return $response;
diff --git a/lib/Federation/Proxy/TalkV1/Controller/RoomController.php b/lib/Federation/Proxy/TalkV1/Controller/RoomController.php
index 963e3eb2da2..651719f7aac 100644
--- a/lib/Federation/Proxy/TalkV1/Controller/RoomController.php
+++ b/lib/Federation/Proxy/TalkV1/Controller/RoomController.php
@@ -91,7 +91,12 @@ public function joinFederatedRoom(Room $room, Participant $participant): DataRes
 
 		$headers = ['X-Nextcloud-Talk-Proxy-Hash' => $this->proxy->overwrittenRemoteTalkHash($proxy->getHeader('X-Nextcloud-Talk-Hash'))];
 
-		return new DataResponse([], $statusCode, $headers);
+		/** @var TalkRoom[] $data */
+		$data = $this->proxy->getOCSData($proxy);
+
+		$data = $this->userConverter->convertAttendee($room, $data, 'actorType', 'actorId', 'displayName');
+
+		return new DataResponse($data, $statusCode, $headers);
 	}
 
 	/**
diff --git a/lib/Service/RoomService.php b/lib/Service/RoomService.php
index cfd1abd99d0..22b79f4ce8d 100644
--- a/lib/Service/RoomService.php
+++ b/lib/Service/RoomService.php
@@ -28,6 +28,7 @@
 use OCA\Talk\Model\Attendee;
 use OCA\Talk\Model\BreakoutRoom;
 use OCA\Talk\Participant;
+use OCA\Talk\ResponseDefinitions;
 use OCA\Talk\Room;
 use OCA\Talk\Webinary;
 use OCP\AppFramework\Utility\ITimeFactory;
@@ -43,6 +44,9 @@
 use OCP\Security\IHasher;
 use OCP\Share\IManager as IShareManager;
 
+/**
+ * @psalm-import-type TalkRoom from ResponseDefinitions
+ */
 class RoomService {
 
 	public function __construct(
@@ -429,7 +433,8 @@ public function setAvatar(Room $room, string $avatar): bool {
 	 * @throws InvalidArgumentException When trying to start
 	 */
 	public function setCallRecording(Room $room, int $status = Room::RECORDING_NONE, ?Participant $participant = null): void {
-		if (!$this->config->isRecordingEnabled() && $status !== Room::RECORDING_NONE) {
+		$syncFederatedRoom = $room->getRemoteServer() && $room->getRemoteToken();
+		if (!$syncFederatedRoom && !$this->config->isRecordingEnabled() && $status !== Room::RECORDING_NONE) {
 			throw new InvalidArgumentException('config');
 		}
 
@@ -993,6 +998,101 @@ public function setLastActivity(Room $room, \DateTime $now): void {
 		$room->setLastActivity($now);
 	}
 
+	/**
+	 * @param Room $localRoom
+	 * @param TalkRoom $host
+	 * @return void
+	 */
+	public function syncPropertiesFromHostRoom(Room $local, array $host): void {
+		$update = $this->db->getQueryBuilder();
+		$update->update('talk_rooms')
+			->where($update->expr()->eq('id', $update->createNamedParameter($local->getId(), IQueryBuilder::PARAM_INT)));
+
+		if (isset($host['type']) && $host['type'] !== $local->getType()) {
+			$local->setType($host['type']);
+			$update->set('type', $update->createNamedParameter($host['type'], IQueryBuilder::PARAM_INT));
+			$changed = true;
+		}
+		if (isset($host['name']) && $host['name'] !== $local->getName()) {
+			$local->setName($host['name']);
+			$update->set('name', $update->createNamedParameter($host['name']));
+			$changed = true;
+		}
+		if (isset($host['description']) && $host['description'] !== $local->getDescription()) {
+			$local->setDescription($host['description']);
+			$update->set('description', $update->createNamedParameter($host['description']));
+			$changed = true;
+		}
+		if (isset($host['callRecording']) && $host['callRecording'] !== $local->getCallRecording()) {
+			$local->setCallRecording($host['callRecording']);
+			$update->set('call_recording', $update->createNamedParameter($host['callRecording'], IQueryBuilder::PARAM_INT));
+			$changed = true;
+		}
+		if (isset($host['defaultPermissions']) && $host['defaultPermissions'] !== $local->getDefaultPermissions()) {
+			$local->setDefaultPermissions($host['defaultPermissions']);
+			$update->set('default_permissions', $update->createNamedParameter($host['defaultPermissions'], IQueryBuilder::PARAM_INT));
+			$changed = true;
+		}
+		if (isset($host['avatarVersion']) && $host['avatarVersion'] !== $local->getAvatar()) {
+			$local->setAvatar($host['avatarVersion']);
+			$update->set('avatar', $update->createNamedParameter($host['avatarVersion'])); // FIXME breaking .jpg?
+			$changed = true;
+		}
+		if (isset($host['lastActivity']) && $host['lastActivity'] !== $local->getLastActivity()) { // FIXME DateTime|null vs int
+			$local->setLastActivity($host['lastActivity']); // FIXME DateTime|null vs int
+		}
+		if (isset($host['lobbyState']) && $host['lobbyState'] !== $local->getLobbyState(false)) {
+			$local->setLobbyState($host['lobbyState']);
+			$update->set('lobby_state', $update->createNamedParameter($host['lobbyState'], IQueryBuilder::PARAM_INT));
+			$changed = true;
+		}
+		if (isset($host['lobbyTimer']) && $host['lobbyTimer'] !== $local->getLobbyTimer(false)) { // FIXME DateTime|null vs int
+			$local->setLobbyTimer($host['lobbyTimer']); // FIXME DateTime|null vs int
+		}
+		if (isset($host['callStartTime'], $host['callFlag']) && (
+				$host['callStartTime'] !== $local->getActiveSince() // FIXME DateTime|null vs int
+				|| $host['callFlag'] !== $local->getCallFlag()
+			)) {
+			$local->setActiveSince($host['callStartTime'], $host['callFlag']); // FIXME DateTime|null vs int
+		}
+		if (isset($host['mentionPermissions']) && $host['mentionPermissions'] !== $local->getMentionPermissions()) {
+			$local->setMentionPermissions($host['mentionPermissions']);
+			$update->set('mention_permissions', $update->createNamedParameter($host['mentionPermissions'], IQueryBuilder::PARAM_INT));
+			$changed = true;
+		}
+		if (isset($host['messageExpiration']) && $host['messageExpiration'] !== $local->getMessageExpiration()) {
+			$local->setMessageExpiration($host['messageExpiration']);
+			$update->set('message_expiration', $update->createNamedParameter($host['messageExpiration'], IQueryBuilder::PARAM_INT));
+			$changed = true;
+		}
+		if (isset($host['readOnly']) && $host['readOnly'] !== $local->getReadOnly()) {
+			$local->setReadOnly($host['readOnly']);
+			$update->set('read_only', $update->createNamedParameter($host['readOnly'], IQueryBuilder::PARAM_INT));
+			$changed = true;
+		}
+		if (isset($host['recordingConsent']) && $host['recordingConsent'] !== $local->getRecordingConsent()) {
+			$local->setRecordingConsent($host['recordingConsent']);
+			$update->set('recording_consent', $update->createNamedParameter($host['recordingConsent'], IQueryBuilder::PARAM_INT));
+			$changed = true;
+		}
+		if (isset($host['sipEnabled']) && $host['sipEnabled'] !== $local->getSIPEnabled()) {
+			$local->setSIPEnabled($host['sipEnabled']);
+			$update->set('sip_enabled', $update->createNamedParameter($host['sipEnabled'], IQueryBuilder::PARAM_INT));
+			$changed = true;
+		}
+		// Ignore for now, so the conversation is not found by other users on this fedederated participants server
+		// if (isset($host['listable']) && $host['listable'] !== $local->getListable()) {
+		// $local->setListable($host['listable']);
+		// $update->set('listable', $update->createNamedParameter($host['listable'], IQueryBuilder::PARAM_INT));
+		// }
+
+		if ($changed) {
+			$update->executeStatement();
+		}
+
+		// FIXME trigger events?
+	}
+
 	public function deleteRoom(Room $room): void {
 		$event = new BeforeRoomDeletedEvent($room);
 		$this->dispatcher->dispatchTyped($event);