diff --git a/lib/Controller/SignalingController.php b/lib/Controller/SignalingController.php
index 642f2e701c5..bcad873c0f7 100644
--- a/lib/Controller/SignalingController.php
+++ b/lib/Controller/SignalingController.php
@@ -382,12 +382,11 @@ protected function getUsersInRoom(Room $room, int $pingTimestamp): array {
 		$timestamp = min($this->timeFactory->getTime() - (self::PULL_MESSAGES_TIMEOUT + 10), $pingTimestamp);
 		// "- 1" is needed because only the participants whose last ping is
 		// greater than the given timestamp are returned.
-		// FIXME needs to select session and left join attendees instead!
-		$participants = $this->participantService->getParticipantsForRoom($room);
+		$participants = $this->participantService->getParticipantsForAllSessions($room, $timestamp - 1);
 		foreach ($participants as $participant) {
 			$session = $participant->getSession();
 			if (!$session instanceof Session) {
-				// User is not active
+				// This is just to make Psalm happy, since we select by session it's always with one.
 				continue;
 			}
 
diff --git a/lib/Service/ParticipantService.php b/lib/Service/ParticipantService.php
index e4b5729f625..a788d009ca2 100644
--- a/lib/Service/ParticipantService.php
+++ b/lib/Service/ParticipantService.php
@@ -604,9 +604,10 @@ public function getParticipantsForRoom(Room $room): array {
 
 	/**
 	 * @param Room $room
+	 * @param int $maxAge
 	 * @return Participant[]
 	 */
-	public function getParticipantsForAllSessions(Room $room): array {
+	public function getParticipantsForAllSessions(Room $room, int $maxAge = 0): array {
 		$query = $this->connection->getQueryBuilder();
 
 		$helper = new SelectHelper();
@@ -620,6 +621,10 @@ public function getParticipantsForAllSessions(Room $room): array {
 			->where($query->expr()->eq('a.room_id', $query->createNamedParameter($room->getId(), IQueryBuilder::PARAM_INT)))
 			->andWhere($query->expr()->isNotNull('s.id'));
 
+		if ($maxAge > 0) {
+			$query->andWhere($query->expr()->gt('s.last_ping', $query->createNamedParameter($maxAge, IQueryBuilder::PARAM_INT)));
+		}
+
 		return $this->getParticipantsFromQuery($query, $room);
 	}
 
diff --git a/lib/Signaling/BackendNotifier.php b/lib/Signaling/BackendNotifier.php
index fb290f0438e..2b524505aa7 100644
--- a/lib/Signaling/BackendNotifier.php
+++ b/lib/Signaling/BackendNotifier.php
@@ -251,8 +251,7 @@ public function participantsModified(Room $room, array $sessionIds): void {
 		$this->logger->info('Room participants modified: ' . $room->getToken() . ' ' . print_r($sessionIds, true));
 		$changed = [];
 		$users = [];
-		// FIXME needs to select session and left join attendees instead!
-		$participants = $this->participantService->getParticipantsForRoom($room);
+		$participants = $this->participantService->getParticipantsForAllSessions($room);
 		foreach ($participants as $participant) {
 			$attendee = $participant->getAttendee();
 			if ($attendee->getActorType() !== Attendee::ACTOR_USERS
@@ -312,8 +311,7 @@ public function roomInCallChanged(Room $room, int $flags, array $sessionIds): vo
 		$changed = [];
 		$users = [];
 
-		// FIXME needs to select session and left join attendees instead!
-		$participants = $this->participantService->getParticipantsForRoom($room);
+		$participants = $this->participantService->getParticipantsForAllSessions($room);
 		foreach ($participants as $participant) {
 			$attendee = $participant->getAttendee();
 			if ($attendee->getActorType() !== Attendee::ACTOR_USERS