diff --git a/tools/chatgui/src/mainwindow.cpp b/tools/chatgui/src/mainwindow.cpp
index 7017ace3..b73d9c6d 100644
--- a/tools/chatgui/src/mainwindow.cpp
+++ b/tools/chatgui/src/mainwindow.cpp
@@ -619,7 +619,12 @@ void MainWindow::setupBridgeCallbacks() {
 
 void MainWindow::setupConnects() {
     connect(m_messageList, &MessageList::streamPublishRequested, this, [this](quint64 group) {
-        if (!m_streamPublisher) m_streamPublisher = new StreamPublishEngine(this);
+        if (!m_streamPublisher) {
+            m_streamPublisher = new StreamPublishEngine(this);
+            connect(m_streamPublisher, &StreamPublishEngine::stateChanged, this, [this](const QString& state) {
+                if (m_trayIcon) m_trayIcon->setToolTip(m_streamPublisher->active() ? QStringLiteral("vibechat · ") + state : QStringLiteral("vibechat"));
+            });
+        }
         if (m_streamPublishWindow) delete m_streamPublishWindow.data();
         m_streamPublishWindow = new StreamPublishWindow(m_streamPublisher, m_streamPublisher->active() ? m_streamPublisher->group() : group, this);
         m_streamPublishWindow->show(); m_streamPublishWindow->raise(); m_streamPublishWindow->activateWindow();
@@ -772,7 +777,14 @@ void MainWindow::onCallAccepted(quint64 callId) {
     CallWindow* w = m_activeCalls.value(callId, nullptr);
     if (w) w->setState(CallWindow::Active);
     if (!s_mainWindow) return;
-    CallAudioEngine::instance()->start(callId);
+    if (CallAudioEngine::instance()->start(callId) != 0) {
+        DEBUG_WARN(DEBUG_CATEGORY_CALL, "desktop call cannot acquire audio; hangup id=%llu", (unsigned long long)callId);
+        auto* request = static_cast<call_id_arg*>(u_malloc(sizeof(call_id_arg)));
+        if (request) { request->inst = gui_bridge_get_inst(); request->call_id = callId; gui_bridge_post_uasync_fn(call_hangup_trampoline, request); }
+        else DEBUG_ERROR(DEBUG_CATEGORY_CALL, "desktop failed call hangup allocation failed");
+        closeCallWindow(callId);
+        QMessageBox::information(this, QStringLiteral("vibechat"), QCoreApplication::translate("ChatGui", "The microphone is used by a call, radio or recording"));
+    }
 }
 
 void MainWindow::onCallEnded(quint64 callId, uint8_t reason) {
diff --git a/tools/chatgui/src/stream_publish_engine.cpp b/tools/chatgui/src/stream_publish_engine.cpp
index 8bc0a382..aac5af6b 100644
--- a/tools/chatgui/src/stream_publish_engine.cpp
+++ b/tools/chatgui/src/stream_publish_engine.cpp
@@ -151,7 +151,7 @@ bool StreamPublishEngine::openSource(const StreamPublishConfig& config) {
         }
         if (best.isNull()) { DEBUG_ERROR(DEBUG_CATEGORY_VIDEO, "desktop camera lacks requested fps=%d", config.video.fps); return false; }
         m->camera->setCameraFormat(best); m->session->setCamera(m->camera.get());
-        connect(m->camera.get(), &QCamera::errorOccurred, this, [failed](QCamera::Error, const QString& error) { failed(error); });
+        connect(m->camera.get(), &QCamera::errorOccurred, this, [failed](QCamera::Error, const QString& error) { failed(error); }, Qt::QueuedConnection);
         m->camera->start();
     } else if (config.source.kind == StreamVideoSource::Screen) {
         m->screen = std::make_unique<QScreenCapture>();
@@ -162,13 +162,13 @@ bool StreamPublishEngine::openSource(const StreamPublishConfig& config) {
             m->screen->setScreen(selected);
         }
         m->session->setScreenCapture(m->screen.get());
-        connect(m->screen.get(), &QScreenCapture::errorOccurred, this, [failed](QScreenCapture::Error, const QString& error) { failed(error); });
+        connect(m->screen.get(), &QScreenCapture::errorOccurred, this, [failed](QScreenCapture::Error, const QString& error) { failed(error); }, Qt::QueuedConnection);
         m->screen->start();
     } else {
         auto window = config.source.window.value<QCapturableWindow>();
         if (!window.isValid()) { DEBUG_ERROR(DEBUG_CATEGORY_VIDEO, "desktop window is unavailable"); return false; }
         m->window = std::make_unique<QWindowCapture>(); m->window->setWindow(window); m->session->setWindowCapture(m->window.get());
-        connect(m->window.get(), &QWindowCapture::errorOccurred, this, [failed](QWindowCapture::Error, const QString& error) { failed(error); });
+        connect(m->window.get(), &QWindowCapture::errorOccurred, this, [failed](QWindowCapture::Error, const QString& error) { failed(error); }, Qt::QueuedConnection);
         m->window->start();
     }
     DEBUG_INFO(DEBUG_CATEGORY_VIDEO, "desktop capture started generation=%llu kind=%d source=%s target=%dx%d/%dfps",