One-page reference: the four PLC families (zero insertion, waveform substitution / G.711 App I, model-based, neural), what WebRTC's NetEQ Expand and Merge operations do, how PLC compares with FEC/RED and retransmission (latency, bandwidth, exact-recovery), the Opus 1.5 deep-PLC and DRED build flags and costs, the isolated-vs-burst loss rule, and the getStats concealment fields to watch.
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