diff --git a/src/call/call_timeline.cpp b/src/call/call_timeline.cpp
index 423d4dac..500fc44c 100644
--- a/src/call/call_timeline.cpp
+++ b/src/call/call_timeline.cpp
@@ -143,10 +143,19 @@ void CallTimeline::progress(uint64_t deviceEpoch, uint64_t position, int64_t atU
     while (output.count > 1 && output.front().first + output.front().count <= minimumPosition) output.pop();
 }
 
+/* Устройство меняется, но PCM/PTS, монотонная позиция и сетевой резерв сохраняются. */
+void CallTimeline::suspend_device(uint64_t deviceEpoch) {
+    if (deviceEpoch != epoch) return;
+    anchorReceived = -1;
+    DEBUG_INFO(DEBUG_CATEGORY_CALL, "audio clock device suspended epoch=%llu position=%llu written=%llu",
+        (unsigned long long)epoch, (unsigned long long)anchorPosition, (unsigned long long)written);
+}
+
 call_clock_snapshot CallTimeline::clock(int64_t nowUs) {
     call_clock_snapshot result{};
     result.epoch = epoch; result.written_samples = written; result.pts_us = lastPts; result.measured = measured;
-    if (outputFailed || deviceFailed || !haveAnchor || !output.count || nowUs < anchorReceived || nowUs - anchorReceived > 250000) return result;
+    if (outputFailed || deviceFailed || !haveAnchor || !output.count || anchorReceived < 0 ||
+        nowUs < anchorReceived || nowUs - anchorReceived > 250000) return result;
     uint64_t pending = anchorTime > nowUs ? (uint64_t)std::ceil((anchorTime - nowUs) / sampleUs) : 0;
     uint64_t position = pending > anchorPosition ? 0 : anchorPosition - pending;
     position = std::max(position, minimumPosition);
diff --git a/src/call/call_timeline.h b/src/call/call_timeline.h
index 67ae058c..614e0dd5 100644
--- a/src/call/call_timeline.h
+++ b/src/call/call_timeline.h
@@ -18,6 +18,7 @@ public:
     void read(unsigned samples);
     void silence(unsigned samples);
     void progress(uint64_t epoch, uint64_t position, int64_t at_us, int64_t received_us, bool measured);
+    void suspend_device(uint64_t epoch);
     call_clock_snapshot clock(int64_t now_us);
 private:
     struct Span {
diff --git a/tools/chatgui/tests/test_call_timeline.cpp b/tools/chatgui/tests/test_call_timeline.cpp
index b15a490d..4a5302c6 100644
--- a/tools/chatgui/tests/test_call_timeline.cpp
+++ b/tools/chatgui/tests/test_call_timeline.cpp
@@ -130,8 +130,27 @@ static void test_failure_and_recovery() {
     DEBUG_INFO(DEBUG_CATEGORY_CALL, "PASS timeline: regressing/impossible device head, overread, bounded overflow, reset recovery");
 }
 
+static void test_device_reopen() {
+    CallTimeline map;
+    map.reset(7); map.feed(1000000, 1920, 1);
+    map.source({SourceKind::Copy, SourceError::None, 0, 0, 0, 1920}); map.read(1920);
+    map.progress(7, 960, 30000, 10000, true);
+    auto before = map.clock(20000); CHECK(before.valid);
+    map.suspend_device(6); CHECK(map.clock(20000).valid);
+    map.suspend_device(7); CHECK(!map.clock(20001).valid);
+    CHECK(map.clock(20001).written_samples == 1920);
+    map.progress(7, 1920, 70000, 50000, true);
+    auto after = map.clock(50000);
+    CHECK(after.valid && after.epoch == 7 && after.pts_us >= before.pts_us);
+    CHECK(after.played_samples == 960);
+    map.suspend_device(7);
+    map.progress(7, 1000, 80000, 60000, true); // Пересоздание не разрешает регрессию общей позиции.
+    CHECK(!map.clock(60000).valid);
+    DEBUG_INFO(DEBUG_CATEGORY_CALL, "PASS timeline: device reopen preserves PCM/epoch and rejects old/regressing anchors");
+}
+
 int main() {
     debug_config_init(); debug_set_level(DEBUG_LEVEL_INFO);
-    test_boundaries(); test_mix(); test_hardware_anchor_transition(); test_long_run(); test_failure_and_recovery();
+    test_boundaries(); test_mix(); test_hardware_anchor_transition(); test_long_run(); test_failure_and_recovery(); test_device_reopen();
     return 0;
 }