diff --git a/src/App.vue b/src/App.vue
index 7430c5b86b6..9240d09e8a5 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -22,7 +22,9 @@ import debounce from 'debounce'
 import { provide } from 'vue'
 
 import { getCurrentUser } from '@nextcloud/auth'
+import { showWarning } from '@nextcloud/dialogs'
 import { emit, subscribe, unsubscribe } from '@nextcloud/event-bus'
+import { loadState } from '@nextcloud/initial-state'
 import { t } from '@nextcloud/l10n'
 import { generateUrl } from '@nextcloud/router'
 
@@ -197,6 +199,7 @@ export default {
 		EventBus.off('switch-to-conversation')
 		EventBus.off('conversations-received')
 		EventBus.off('forbidden-route')
+		EventBus.off('signaling-internal-show-warning', this.showSignalingInternalWarning)
 	},
 
 	beforeMount() {
@@ -333,6 +336,10 @@ export default {
 			}
 		})
 
+		if (loadState('spreed', 'signaling_mode') === 'internal') {
+			EventBus.on('signaling-internal-show-warning', this.showSignalingInternalWarning)
+		}
+
 		const beforeRouteChangeListener = (to, from, next) => {
 			if (this.isNextcloudTalkHashDirty) {
 				// Nextcloud Talk configuration changed, reload the page when changing configuration
@@ -615,7 +622,13 @@ export default {
 
 			// Breakout to breakout
 			return oldConversation.objectType === CONVERSATION.OBJECT_TYPE.BREAKOUT_ROOM && newConversation.objectType === CONVERSATION.OBJECT_TYPE.BREAKOUT_ROOM
-		}
+		},
+
+		showSignalingInternalWarning(token) {
+			if (this.$store.getters.isModerator || this.$store.getters.participantsList(token)?.length > 4) {
+				showWarning(t('spreed', 'Having a call with more than 4 participants without external signaling server can cause connectivity issues and cause high load on participating devices'))
+			}
+		},
 	},
 }
 </script>
diff --git a/src/FilesSidebarTabApp.vue b/src/FilesSidebarTabApp.vue
index 9865a361b68..53b4f49e20b 100644
--- a/src/FilesSidebarTabApp.vue
+++ b/src/FilesSidebarTabApp.vue
@@ -202,6 +202,7 @@ export default {
 				// signaling server is used periodic polling has to be used
 				// instead.
 				OCA.Talk.fetchCurrentConversationIntervalId = window.setInterval(OCA.Talk.fetchCurrentConversationWrapper, 30000)
+				// TODO
 			}
 		},
 
diff --git a/src/PublicShareAuthSidebar.vue b/src/PublicShareAuthSidebar.vue
index e0976aff082..a3b015bbeba 100644
--- a/src/PublicShareAuthSidebar.vue
+++ b/src/PublicShareAuthSidebar.vue
@@ -156,6 +156,7 @@ export default {
 				// signaling server is used periodic polling has to be used
 				// instead.
 				this.fetchCurrentConversationIntervalId = window.setInterval(this.fetchCurrentConversation, 30000)
+				// TODO
 			}
 
 			if (currentUser || guestNickname) {
diff --git a/src/PublicShareSidebar.vue b/src/PublicShareSidebar.vue
index 42124922432..ffd7cd2776e 100644
--- a/src/PublicShareSidebar.vue
+++ b/src/PublicShareSidebar.vue
@@ -197,6 +197,7 @@ export default {
 				// signaling server is used periodic polling has to be used
 				// instead.
 				this.fetchCurrentConversationIntervalId = window.setInterval(this.fetchCurrentConversation, 30000)
+				// TODO
 			}
 		},
 
diff --git a/src/utils/signaling.js b/src/utils/signaling.js
index 9f2bd012831..73d846cf686 100644
--- a/src/utils/signaling.js
+++ b/src/utils/signaling.js
@@ -579,6 +579,14 @@ Signaling.Internal.prototype.sendPendingMessages = function() {
 	}.bind(this))
 }
 
+Signaling.Internal.prototype._joinCallSuccess = function(token) {
+	if (this.hideWarning) {
+		return
+	}
+
+	EventBus.emit('signaling-internal-show-warning', token)
+}
+
 /**
  * @param {object} settings The signaling settings
  * @param {string|string[]} urls The url of the signaling server