It is possible to reduce some amount of packet loss by generating voice samples to replace the missing samples. ITU standards G.711 Annex I and the G.729 standard define methods for packet loss concealment. For excessive packets, it is not possible to generate voice samples, therefore, packet loss concealment results in comfort noise generation (CNG).

PLC functions by slowly silencing the voice packets. PLC can be applied over the loss of a maximum of six consecutive packets.