Latency between speakers grew to multiple seconds and only reset on rejoining voice. Root cause was the receiver playout logic, not the codec settings: the playout clock free-ran in real time while the sender omitted silence from its timestamps (and set no header flags), and the only correction snapped the clock to the *oldest* buffered frame — which could only ever add standing latency. target_depth_ms_ was computed but never enforced, so latency could only grow or reset. Fix: bound playout against the stream's leading edge (newest frame). (Re)seed to the leading edge on start/marker/starve (no prebuffer, so latency stays low), and frame-skip catch-up trims any backlog beyond target+hysteresis — the missing downward force. Hardening: sender now stamps kFlagMarker (talkspurt start) and kFlagDtx, consumed on recv for clean resync; adaptive late-drop window; EWMA outlier rejection so silence gaps/stragglers don't poison the estimate; duplicate counting and ring-underrun diagnostics. New test_jitter_depth asserts depth stays bounded (<200ms) while arrivals outrun playback. ctest --preset dev green (27/27). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>