diff --git a/src/routes/idaa/(idaa)/video_conferences/+page.svelte b/src/routes/idaa/(idaa)/video_conferences/+page.svelte
index ba85324f..0b92815d 100644
--- a/src/routes/idaa/(idaa)/video_conferences/+page.svelte
+++ b/src/routes/idaa/(idaa)/video_conferences/+page.svelte
@@ -429,14 +429,19 @@ async function fetch_novi_data() {
     room_name = url_params.room ?? 'Default-Room';
     domain = url_params.domain ?? 'jitsi.dgrzone.com';
 
-    // Initialize sound settings from URL params
-    disable_incoming_msg_sound = url_params.incoming_msg_sound === 'true';
-    disable_participant_joined_sound =
-        url_params.participant_joined_sound === 'true';
-    disable_participant_left_sound =
-        url_params.participant_left_sound === 'true';
-    disable_reaction_sound = url_params.reaction_sound === 'true';
-    disable_raise_hand_sound = url_params.raise_hand_sound === 'true';
+    // Override sound defaults from URL params only when explicitly provided.
+    // If the param is absent (null), keep the $state defaults — the iframe template
+    // does not pass these params, so unconditional assignment would wipe out the defaults.
+    if (url_params.incoming_msg_sound !== null)
+        disable_incoming_msg_sound = url_params.incoming_msg_sound === 'true';
+    if (url_params.participant_joined_sound !== null)
+        disable_participant_joined_sound = url_params.participant_joined_sound === 'true';
+    if (url_params.participant_left_sound !== null)
+        disable_participant_left_sound = url_params.participant_left_sound === 'true';
+    if (url_params.reaction_sound !== null)
+        disable_reaction_sound = url_params.reaction_sound === 'true';
+    if (url_params.raise_hand_sound !== null)
+        disable_raise_hand_sound = url_params.raise_hand_sound === 'true';
 
     if (log_lvl) {
         console.log(