Packet Loss Concealment (PLC)

Packet loss concealment refers to a method of hiding the fact a media packet was lost. For example, in the case that a G.711 packet was lost, the VoIP device may elect to simply replay the last packet to disguise the fact that a packet was lost, rather than allowing the user to hear silence. While that is an extremely simple technique, there are more advanced algorithms to provide packet loss concealment, with some codecs (e.g., G.729) having PLC as an integral part of the design.

See Also: Voice over IP (VoIP), CODEC