diff --git a/tools/chatgui/src/call_video_encoder.cpp b/tools/chatgui/src/call_video_encoder.cpp
index 5eca0fdb..39cfb0bb 100644
--- a/tools/chatgui/src/call_video_encoder.cpp
+++ b/tools/chatgui/src/call_video_encoder.cpp
@@ -4,9 +4,10 @@
 #include <QElapsedTimer>
 
 // Профиль и envelope задаются явно: автоматический выбор level при смене bitrate запрещён.
-bool CallVideoEncoder::open(const LiveVideoConfig& config, uint64_t generation) {
+bool CallVideoEncoder::open(const LiveVideoConfig& config, uint64_t generation, uint32_t maximumBitrate) {
     if (!generation || config.profile == LiveVideoProfile::Automatic || config.references != 1
-        || config.bitrate < CALL_VIDEO_RATE_MIN_BPS || config.bitrate > CALL_VIDEO_RATE_MAX_BPS) {
+        || maximumBitrate < CALL_VIDEO_RATE_MIN_BPS || maximumBitrate > CALL_VIDEO_RATE_MAX_BPS
+        || config.bitrate < CALL_VIDEO_RATE_MIN_BPS || config.bitrate > maximumBitrate) {
         m_error = "Invalid call video encoder configuration";
         DEBUG_ERROR(DEBUG_CATEGORY_CALL, "call video open invalid generation=%llu bitrate=%d profile=%d refs=%d",
                     (unsigned long long)generation, config.bitrate, (int)config.profile, config.references); return false;
@@ -16,6 +17,7 @@ bool CallVideoEncoder::open(const LiveVideoConfig& config, uint64_t generation)
         m_error = candidate->error(); DEBUG_ERROR(DEBUG_CATEGORY_CALL, "call video open failed: %s", qPrintable(m_error)); return false;
     }
     close(); m_encoder = std::move(candidate); m_config = config; m_config.backend = m_encoder->name(); m_generation = generation;
+    m_maximumBitrate = maximumBitrate;
     DEBUG_INFO(DEBUG_CATEGORY_CALL, "call video encoder opened generation=%llu codec=%d encoder=%s bitrate=%d level=%d",
                (unsigned long long)generation, config.codec, qPrintable(m_config.backend), config.bitrate, config.level); return true;
 }
@@ -24,13 +26,14 @@ void CallVideoEncoder::close() {
     if (m_encoder) DEBUG_DEBUG(DEBUG_CATEGORY_CALL, "call video encoder close generation=%llu pending_request=%llu",
                               (unsigned long long)m_generation, (unsigned long long)m_request);
     m_encoder.reset(); m_config = {}; m_config.bitrate = 0; m_error.clear();
-    m_generation = m_request = m_lastRequest = m_lastPts = m_lastKey = 0; m_pendingBitrate = 0; m_haveFrame = false;
+    m_generation = m_request = m_lastRequest = m_lastPts = m_lastKey = 0;
+    m_pendingBitrate = m_maximumBitrate = 0; m_haveFrame = false;
 }
 
 // Ядро сериализует команды; повторные/чужие requests не заменяют уже ожидающую команду.
 bool CallVideoEncoder::requestBitrate(uint64_t generation, uint64_t request, uint32_t bitrate) {
     if (!m_encoder || generation != m_generation || !request || request <= m_lastRequest || m_request
-        || bitrate < CALL_VIDEO_RATE_MIN_BPS || bitrate > CALL_VIDEO_RATE_MAX_BPS) {
+        || bitrate < CALL_VIDEO_RATE_MIN_BPS || bitrate > m_maximumBitrate) {
         DEBUG_WARN(DEBUG_CATEGORY_CALL, "call video bitrate rejected generation=%llu/%llu request=%llu last=%llu pending=%llu bitrate=%u",
                    (unsigned long long)generation, (unsigned long long)m_generation, (unsigned long long)request,
                    (unsigned long long)m_lastRequest, (unsigned long long)m_request, bitrate); return false;
diff --git a/tools/chatgui/src/call_video_encoder.h b/tools/chatgui/src/call_video_encoder.h
index 61901d5f..21a6a6b4 100644
--- a/tools/chatgui/src/call_video_encoder.h
+++ b/tools/chatgui/src/call_video_encoder.h
@@ -13,7 +13,7 @@ struct CallVideoRateCompletion {
 
 class CallVideoEncoder {
 public:
-    bool open(const LiveVideoConfig& config, uint64_t generation);
+    bool open(const LiveVideoConfig& config, uint64_t generation, uint32_t maximumBitrate);
     void close();
     bool requestBitrate(uint64_t generation, uint64_t request, uint32_t bitrate);
     // Один вход -> один выход. На false output не меняется; completion нужно обработать и на ошибке.
@@ -25,6 +25,6 @@ private:
     LiveVideoConfig m_config;
     QString m_error;
     uint64_t m_generation = 0, m_request = 0, m_lastRequest = 0, m_lastPts = 0, m_lastKey = 0;
-    uint32_t m_pendingBitrate = 0;
+    uint32_t m_pendingBitrate = 0, m_maximumBitrate = 0;
     bool m_haveFrame = false;
 };